kPa to PSI Converter: Canadian Tire Pressure, MPa Engineering, Engine Vacuum, Pipeline Specs, and CPAP Pressure in US Measurements
Convert kPa to psi instantly. 1 kPa = 0.14504 psi. 220 kPa = 31.908 psi (Canadian car tire). 1 bar = 100 kPa exactly. 101.325 kPa = 14.696 psi = 1 standard atmosphere. 1 MPa = 1,000 kPa = 145.038 psi. Also converts psi to kPa. Outputs bar, Pa, and atm. NIST SP 811 derivation. Free PDF report and batch converter included.
kPa to PSI Calculator
Enter a pressure to convert
Canadian tire: 220 kPa front (32 psi), 250 kPa SUV rear (36 psi). 1 MPa = 1000 kPa = 145 psi. Engine vacuum: -30 to -80 kPa. 101.325 kPa = 14.696 psi = 1 atm.
Canadian and US Pressure Reference Chart (0-700 kPa, hover for psi)
kPa in North America: Canada, Engineering, and the Metric Pressure World Next Door
If you drive across the US-Canada border, pump gas in Ontario, or read the tire placard on a Honda CR-V bought at a Canadian dealership, you encounter kilopascals. Canada officially adopted the SI system in 1970 under the Metric Commission Canada mandate, and Transport Canada’s Canadian Motor Vehicle Safety Standards (CMVSS) permits tire pressure placards in kPa, bar, or psi. In practice, most Canadian automakers and dealers print kPa as the primary unit. A typical Canadian Honda Civic door sticker reads: Front 220 kPa (32 psi), Rear 220 kPa (32 psi). A Canadian Toyota Highlander reads: Front 240 kPa (35 psi), Rear 250 kPa (36 psi). When that vehicle crosses the border or is imported to the US, the American owner needs to fill it at a US gas station where every gauge shows only psi. kPa-to-psi conversion is a practical daily skill along the entire Canada-US border corridor from Maine to Washington State, and increasingly nationwide as the Canadian border trade brings Canadian-spec vehicles into the US used car market.
Beyond automotive, kPa is the dominant metric engineering pressure unit across North American process industries, pipelines, HVAC engineering, and medical equipment specifications. The Canadian and American engineering communities use kPa and MPa (megapascals) in parallel with psi. Structural engineering codes (ASCE 7, referenced in IBC), mechanical codes, and process engineering standards frequently cite pressure in both kPa and psi. Natural gas pipeline companies operating across the US-Canada border report operating pressures in kPa in Canadian regulatory filings to the National Energy Board (NEB) and in psi for PHMSA (Pipeline and Hazardous Materials Safety Administration) compliance in the US. The exact derivation per NIST SP 811: 1 kPa = 1,000 Pa exactly (SI definition) and 1 psi = 6,894.75729316836 Pa (from 1 lbf = 0.45359237 kg times 9.80665 m/s squared; 1 in squared = 0.00064516 m squared exactly). Therefore: 1 kPa = 1,000 / 6,894.75729316836 = 0.145037737730… psi, a non-terminating decimal requiring Big.js precision arithmetic for accurate fleet-scale tire pressure calculations or pipeline engineering conversions where rounding compounds across hundreds of values.
How This kPa to PSI Converter Works
Enter any pressure in kPa or psi. The calculator outputs all five units: psi (primary when converting from kPa), kPa (primary when converting from psi), bar (note: 1 bar = 100 kPa exactly, so dividing kPa by 100 gives bar with no rounding error), Pa (SI base unit), and atm (standard atmospheres, where 1 atm = 101.325 kPa exactly per BIPM). The context panel below the result identifies what your kPa reading means in the real North American world: from near-vacuum CPAP therapy pressures, through the 220-250 kPa Canadian tire pressure sweet spot (shown in green on the chart), up through residential water pressure, shop air, and industrial 1,000 kPa (1 MPa) territory. The batch converter accepts up to 20 values at once, outputting psi, bar, Pa, and atm simultaneously. This is particularly useful for fleet managers converting an entire Canadian-spec vehicle tire pressure schedule, pipeline engineers batch-converting kPa operating pressure readings to psi for PHMSA filings, or HVAC engineers converting refrigerant pressure logs between kPa and psi formats across Canadian and US service records.
Canadian Tire Pressure Reference: kPa Door-Jamb Placard to US PSI
| Canadian Placard (kPa) | US Equivalent (psi) | Bar | Vehicle Type |
|---|---|---|---|
| 190 kPa | 27.6 psi | 1.90 bar | Economy compact (low end) |
| 200 kPa | 29.0 psi | 2.00 bar | Canadian compact front (Civic, Corolla) |
| 210 kPa | 30.5 psi | 2.10 bar | Canadian mid-size front (Camry, Accord) |
| 220 kPa | 31.9 psi | 2.20 bar | Most common Canadian front tire spec |
| 230 kPa | 33.4 psi | 2.30 bar | Canadian mid-size rear / sport models |
| 240 kPa | 34.8 psi | 2.40 bar | Canadian CUV/SUV front (CR-V, RAV4) |
| 250 kPa | 36.3 psi | 2.50 bar | Canadian SUV rear (Highlander, Pilot) |
| 260 kPa | 37.7 psi | 2.60 bar | Canadian full-size SUV / performance |
| 275 kPa | 39.9 psi | 2.75 bar | Canadian truck / van light load |
| 310 kPa | 44.9 psi | 3.10 bar | Canadian commercial van heavy load |
| 345 kPa | 50.0 psi | 3.45 bar | Road bicycle tire low end |
Three Real US Situations Where kPa-to-PSI Conversion Matters Every Day
Canadian Snowbirds Driving Their Honda CR-V from Toronto to Florida for Winter
A retired couple from Toronto, Ontario drives their 2023 Honda CR-V (purchased from a Canadian Honda dealer) to Sarasota, Florida for winter. Their Canadian door-jamb placard reads: Front 240 kPa (35 psi), Rear 250 kPa (36 psi), Full load Rear 290 kPa (42 psi). The TPMS light comes on outside of Columbus, Ohio after a cold overnight drop from 65 degrees Fahrenheit to 38 degrees Fahrenheit, causing the front tires to lose about 4 kPa (0.6 psi) from the previous evening’s warm reading. Converting at a Pilot travel center: their gauge shows 33 psi front. 240 kPa times 0.14504 = 34.809 psi is the recommended cold front value, so they are about 2 psi (14 kPa) below cold spec. They fill the front tires to 35 psi (241 kPa, close enough to the 240 kPa placard value at 1 psi precision). The rear, at 36 psi (248 kPa), is within 2 kPa of the 250 kPa spec and they leave it alone. The TPMS system on Canadian-spec CR-Vs is calibrated to alert at 25% below the recommended pressure, the same as NHTSA FMVSS 138, just expressed internally in kPa rather than psi: 25% below 240 kPa = 180 kPa = 26.1 psi.
US Pipeline Engineer Converting Canadian NEB Pressure Reports to PHMSA Standards
A natural gas pipeline engineer working for a company operating a cross-border US-Canada pipeline submits compliance reports in kPa to the National Energy Board (NEB, now Canada Energy Regulator) for the Canadian segment and in psi to PHMSA for the US segment. The operating pressure for the mainline: 7,000 kPa maximum allowable operating pressure (MAOP). Converting: 7,000 kPa times 0.145038 = 1,015.3 psi (rounding to 1,015 psi for US filings). This is a Class 1 pipeline per 49 CFR 192, which permits steel line pipe to operate up to 80% of specified minimum yield strength (SMYS). For 12-inch API 5L X52 pipe with SMYS of 52,000 psi (358,527 kPa), the design factor at 1,015 psi operating pressure is 1,015 divided by (52,000 times 0.80) = 1,015 / 41,600 = 2.4% of maximum, well within limits. Pressure testing requirements for new construction: 125% of MAOP = 7,000 kPa times 1.25 = 8,750 kPa (1,269 psi minimum hydrotest pressure). Conversion accuracy matters at this scale: rounding 7,000 kPa to 1,015 psi (using 0.14504) vs the exact 1,015.264 psi creates less than 0.3 psi error, acceptable for pipeline design applications but not for safety-critical valve calibration.
Sleep Specialist Explaining CPAP Pressure Settings to a Patient Moving from Canada to the US
A sleep medicine physician in Buffalo, New York sees a new patient who recently moved from Montreal, Quebec and brings their ResMed CPAP prescription from a Canadian sleep clinic. The Canadian prescription specifies: CPAP pressure 12 cmH2O (centimeters of water). The US clinic’s equipment uses cmH2O as well (the universal CPAP unit), but the patient asks how this relates to the kPa and psi they see on pressure equipment at work. Converting through the chain: 1 cmH2O = 98.0665 Pa (from 1 g/cm cubed water density times 9.80665 m/s squared times 0.01 m height = 98.0665 Pa). So 12 cmH2O = 12 times 98.0665 = 1,176.8 Pa = 1.177 kPa. Converting to psi: 1.177 kPa times 0.14504 = 0.1707 psi. This illustrates why CPAP pressure is never expressed in psi (the values are tiny fractions of 1 psi, making psi impractical for clinical use). The patient’s 12 cmH2O CPAP setting = 1.177 kPa = 0.01177 bar = 0.171 psi absolute gauge above room air. CPAP pressure range for adults: 4-20 cmH2O = 0.39-1.96 kPa = 0.0579-0.2841 psi. BiPAP pressures: IPAP 8-25 cmH2O (0.784-2.452 kPa), EPAP 4-12 cmH2O (0.392-1.177 kPa). The patient’s ResMed Air10 accepts its Canadian prescription settings without modification when used in the US, since CPAP machines use their internal cmH2O/hPa pressure standard globally regardless of voltage (they include universal adapters).
Four Expert Tips on kPa, MPa, and Pressure Unit Navigation for US Professionals
The MPa Shortcut: 1 MPa = 1,000 kPa = 145.038 psi
Megapascals (MPa) appear constantly in structural engineering (concrete compressive strength: 20-50 MPa), materials science (steel yield strength: 250-690 MPa), and fluid mechanics (hydraulic system working pressures: 10-35 MPa). The conversion is clean because 1 MPa = 1,000 kPa and 1,000 kPa times 0.145038 = 145.038 psi exactly to six significant figures. So a concrete design strength of 28 MPa = 28,000 kPa = 4,061 psi. A hydraulic cylinder rated at 21 MPa = 21,000 kPa = 3,046 psi. A steel grade with 345 MPa yield strength = 50,038 psi (very close to the ASTM A36 designation of 36,000 psi / 248 MPa for structural steel). Quick mental shortcut for MPa: multiply by 145 for psi; divide psi by 145 for MPa. For exact conversion: multiply MPa by 1,000 for kPa, then by 0.145038 for psi.
Engine Intake Manifold Vacuum: kPa Negative Gauge Pressure and What It Means
Engine technicians and tuners increasingly work with manifold absolute pressure (MAP) sensors and vacuum gauges calibrated in kPa. At idle, a naturally aspirated gasoline engine has strong intake vacuum: typically -50 to -75 kPa gauge (-7.25 to -10.88 psi gauge), equivalent to 26-51 kPa absolute (absolute atmospheric minus vacuum). At wide-open throttle (WOT): near 0 kPa vacuum (atmospheric). A turbocharged or supercharged engine under boost creates positive gauge pressure: common street setups at 7-14 kPa (1-2 psi) boost for mild tunes to 138-207 kPa (20-30 psi) boost for high-performance applications. OBD-II MAP sensor readings in kPa absolute: at idle = 25-40 kPa absolute (approximately -61 to -76 kPa gauge); at WOT normally aspirated = 95-101 kPa absolute (near atmospheric); at boost = 115-160 kPa absolute (14-60 kPa positive gauge = 2-9 psi boost). Converting a boost gauge reading: a German-spec Audi RS boost target of 1.5 bar absolute = 150 kPa absolute = 21.75 psia = 7.06 psig boost. US aftermarket boost gauges typically read in psi, while European OEM systems display in bar or kPa.
Canadian National Plumbing Code vs US Codes: kPa vs PSI Water Pressure Limits
The Canadian National Plumbing Code (NPC 2020) and National Building Code of Canada (NBC) specify water supply pressures in kPa throughout, while US codes use psi. The NPC maximum static water pressure at service entry: 550 kPa (79.8 psi). The US UPC (Uniform Plumbing Code) maximum: 552 kPa (80 psi), an almost identical limit. The NPC minimum flow pressure at fixtures: 50 kPa (7.25 psi) for ordinary taps, vs the US UPC minimum of 138 kPa (20 psi) at the meter. For plumbers and building inspectors working near the border or on cross-border construction projects: 550 kPa (NPC) and 552 kPa (UPC) are functionally equivalent at the 1 psi precision level of typical gauges. Pressure-reducing valves (PRVs) in Canada are sold and calibrated in kPa (typical setpoint: 350-400 kPa = 50.8-58.0 psi), while US PRVs are labeled in psi. Setting a US PRV to 55 psi gives 379 kPa, which is within the 50-80 psi (345-552 kPa) comfortable range in both the UPC and NPC. Canadian homebuilders along the US border who use both US-spec (psi) and Canadian-spec (kPa) plumbing fixtures and documentation must always verify that the same physical pressure limit is met regardless of which unit system is cited in the governing code. At typical gauge accuracy of plus or minus 1-2 psi (7-14 kPa), the 2 kPa difference between NPC 550 kPa and UPC 552 kPa limits is not detectable in the field.
Natural Gas Distribution Pressures: kPa Tiers from the Wellhead to Your Stove
North American natural gas distribution operates in clearly defined kPa pressure tiers that US engineers must understand in kPa when working with Canadian pipeline data. Transmission pipelines (high-pressure mainlines): 3,500-10,000 kPa (508-1,450 psi), often reported as 3.5-10.0 MPa (508-1,450 psi) in engineering documents. High-pressure distribution mains: 700-3,500 kPa (101-508 psi). Medium-pressure distribution: 14-700 kPa (2-101.5 psi). Low-pressure distribution (most residential supply): 0.25-14 kPa (0.036-2.03 psi). Service line to residential meter: 1.75-7.0 kPa (0.25-1.02 psi). Residential appliance manifold pressure: 1.0-1.75 kPa (0.14-0.25 psi, equivalent to about 4-7 inches of water column / in WC). In Canada, gas utilities report pressure in kPa to the Canada Energy Regulator. A technician reading that a residential service must maintain minimum 1.75 kPa at the meter knows this is approximately 0.25 psi, a tiny pressure compared to water or air systems. The natural gas system’s tight low-pressure tolerances make kPa the more practical unit: specifying 1.75 kPa is clearer than 0.254 psi.
kPa in Food Science, Vacuum Sealing, and Sous Vide Cooking
Vacuum Packaging Pressure in kPa: What the Numbers on Your Sealer Mean
Commercial and home vacuum sealer machines (FoodSaver, Weston, chamber vacuum sealers) display vacuum level in kPa or percent vacuum on their control panels. A reading of -90 kPa on a chamber vacuum sealer means the chamber pressure is 90 kPa below atmospheric, equivalent to: atmospheric pressure of 101.325 kPa minus 90 kPa = 11.325 kPa absolute = 1.64 psi absolute (roughly 90% vacuum). Full vacuum (0 Pa absolute) = -101.325 kPa gauge = -14.696 psi gauge. Standard chamber vacuum sealer settings for common foods: fresh meat at -85 to -95 kPa (-12.3 to -13.8 psi gauge); delicate pastries and chips at -50 to -70 kPa (-7.3 to -10.2 psi gauge, to avoid crushing); liquid-containing foods at -60 to -80 kPa (-8.7 to -11.6 psi gauge). Sous vide cooking uses atmospheric pressure (vacuum bags sealed at near-vacuum do not apply significant pressure during the cooking process: a bag sealed at -95 kPa gauge has less than 7 kPa absolute pressure inside, but once submerged in the water bath, the external water pressure above the water surface is negligible). Some modernist cooking techniques use actual pressure cooking: a sous vide circulator set to cooking in a pressure vessel at 120 kPa gauge (17.4 psi gauge) = 221.325 kPa absolute = 32.1 psia = a temperature of approximately 123 degrees Celsius (253 F) when using superheated water.
kPa in Building Science and HVAC Engineering Across the Canada-US Border
Building scientists, mechanical engineers, and HVAC contractors working on buildings near the US-Canada border or on LEED-certified projects that reference both US and Canadian codes encounter kPa and psi frequently in the same set of construction documents. Duct static pressure in air handling systems: both ASHRAE (American) and SMACNA (Sheet Metal and Air Conditioning Contractors’ National Association) standards express duct pressure in inches of water column (in WC) in the US and Pa or kPa in Canadian documents. 1 inch WC = 249.09 Pa = 0.24909 kPa = 0.0361 psi. A typical commercial AHU static pressure of 1.5 inches WC = 373.6 Pa = 0.374 kPa = 0.054 psi, numbers that illustrate why HVAC duct pressures are measured in inches WC or Pa rather than kPa or psi. Refrigerant pressures in HVAC systems: R-410A low side (suction) at 21 degrees Celsius (70 F): 810-896 kPa (117.5-130 psi). R-410A high side (discharge) at 35 degrees Celsius (95 F): 2,413-2,758 kPa (350-400 psi). Canadian HVAC technicians using refrigerant gauges calibrated in kPa: 810 kPa suction = 117.5 psi; 2,413 kPa discharge = 350 psi. US gauges show psi; Canadian gauges may show kPa or bar. Converting: 1 kPa = 0.14504 psi, or equivalently, 1 bar = 100 kPa, so a 24 bar gauge reading = 2,400 kPa = 348.1 psi.
Korean and Japanese Vehicle kPa Tire Specifications: Hyundai, Kia, Toyota, Honda US Models
Beyond Canadian vehicles, kPa tire pressure specifications appear on Korean and Japanese vehicles exported to the US that use kPa as the primary placard unit, sometimes with psi as a secondary value, sometimes kPa only. South Korean automakers Hyundai and Kia increasingly ship global-spec vehicles to the US with kPa-primary placards, particularly on models shared across the South Korean domestic market (where kPa is official). A Hyundai Tucson sold in the US may carry a placard reading 240 kPa / 35 psi front, 240 kPa / 35 psi rear, showing both units. A Kia Telluride Canadian-export spec shows kPa primary: 240 kPa front, 260 kPa rear. Japanese automakers Toyota and Honda consistently dual-label their US-market vehicles (240 kPa / 35 psi), but their Canadian-market vehicles sometimes show kPa as the only unit, and used Canadian imports then require conversion at US gas stations. Korean vehicles from the Hyundai-Kia group, Ssangyong, and Genesis also specify tire pressure in kPa in their service and owner’s manuals distributed globally, making kPa-to-psi conversion essential for independent mechanics and owners who reference the original manufacturer documentation. Understanding this: 240 kPa = 34.809 psi (round to 35 psi), 260 kPa = 37.710 psi (round to 38 psi), 280 kPa = 40.610 psi (round to 41 psi), 300 kPa = 43.511 psi (round to 44 psi).
kPa in Industrial Compressed Air and Pneumatic Systems: US vs Canadian Specs
Industrial facilities straddling the US-Canada border (auto assembly plants in Windsor-Detroit, paper mills in Northern Maine, chemical plants in Sarnia-Port Huron) must work with compressed air system specifications in both kPa and psi simultaneously. Equipment data sheets from Canadian suppliers specify pressure in kPa or MPa; US-sourced equipment uses psi. Common cross-referencing scenarios: a Canadian-supplied air compressor rated for 862 kPa (125 psi) maximum output feeds a US-spec air dryer rated for 125 psi maximum inlet. A Canadian ISO 4414 pneumatic circuit designed for 620-689 kPa (90-100 psi) working pressure connects to US air tools rated for 90-100 psi. Industrial tool manufacturers supplying both Canadian and US facilities (Ingersoll Rand, Atlas Copco, Sullair) dual-label their compressor nameplates: both kPa/MPa and psi appear on the specification plate. Pressure relief valves for Canadian-spec vessels are stamped with kPa ratings (ASME Code Section VIII applies to Canadian pressure vessels under Canadian standards B51); converting to psi is required to verify equivalence with US-purchased replacement valves. A relief valve rated 2,069 kPa = 300 psi in Canadian documentation matches a US-purchased valve rated at 300 psi for the same application.
Quick Reference: Common kPa to PSI Conversions
| kPa | PSI | Bar | atm | Context |
|---|---|---|---|---|
| 1 kPa | 0.14504 psi | 0.01 bar | 0.009869 atm | 1 kPa = 1,000 Pa exactly. 1 bar = 100 kPa exact. |
| 101.325 kPa | 14.696 psi | 1.01325 bar | 1.000 atm | 1 standard atmosphere (ISA, exact per BIPM) |
| 165 kPa | 23.9 psi | 1.65 bar | 1.629 atm | TPMS alert zone (25% below 220 kPa spec) |
| 220 kPa | 31.9 psi | 2.20 bar | 2.171 atm | Most common Canadian front tire spec |
| 250 kPa | 36.3 psi | 2.50 bar | 2.467 atm | Canadian SUV and CUV rear tire |
| 414 kPa | 60.0 psi | 4.14 bar | 4.087 atm | IRC P2903.3.1 residential water preferred |
| 552 kPa | 80.1 psi | 5.52 bar | 5.449 atm | UPC and NPC maximum residential water pressure |
| 862 kPa | 125.0 psi | 8.62 bar | 8.507 atm | Air compressor cutoff (typical US consumer unit) |
| 1,000 kPa | 145.038 psi | 10.0 bar | 9.869 atm | 1 MPa exactly. Engineering pressure reference. |
Frequently Asked Questions About kPa to PSI Conversion
1 kPa = 0.145037737730… psi (non-terminating). Rounded: 0.14504 psi. Derivation: 1 kPa = 1,000 Pa (exact SI). 1 psi = 6,894.75729316836 Pa (NIST SP 811). 1 kPa = 1,000 / 6,894.757 = 0.14504 psi. Also: 1 bar = 100 kPa exactly. 1 atm = 101.325 kPa exactly. Quick rule: divide kPa by 6.895 for approximate psi, or multiply by 0.145.
Multiply kPa by 0.14504: psi = kPa × 0.14504. Precisely: psi = kPa × 1,000 / 6,894.75729316836. Quick mental shortcut: divide kPa by 7 for rough psi (5% overestimate), or divide by 6.9 for better accuracy. Reverse (psi to kPa): kPa = psi × 6.8948. Examples: 220 kPa × 0.14504 = 31.908 psi. 250 kPa × 0.14504 = 36.259 psi.
220 kPa = 220 × 0.14504 = 31.908 psi, rounded to 32 psi. This is the most common Canadian passenger car cold inflation specification, appearing on the door-jamb placard of Honda Civics, Toyota Corollas, and most Canadian-spec compact and mid-size vehicles. At a US gas station with a psi gauge: fill to 32 psi to match the 220 kPa Canadian placard value. Also: 220 kPa = 2.20 bar = 220,000 Pa.
200 kPa = 200 × 0.14504 = 29.008 psi = 2.00 bar = 200,000 Pa. This is at the lower end of the acceptable tire pressure range for most vehicles, common on some economy compact Canadian specifications. A tire at 200 kPa (29 psi) when the placard calls for 220 kPa (32 psi) is 20 kPa (2.9 psi) underinflated, approaching the TPMS alert threshold for many vehicles but not yet at the 25% below-spec alert level.
250 kPa = 250 × 0.14504 = 36.259 psi = 2.50 bar. This is a common rear tire specification for Canadian mid-size and full-size SUVs and crossovers: Toyota Highlander, Honda Pilot, Nissan Pathfinder, and similar vehicles. Fill to 36 psi at a US station to match a 250 kPa Canadian placard. Truck tires: 275-310 kPa (39.9-45.0 psi) are common on Canadian pickup trucks and commercial vans.
32 psi = 32 × 6.8948 kPa = 220.632 kPa, rounded to 221 kPa. This is the US standard passenger car cold inflation (the most common value on US door-jamb placards for compact and mid-size cars). It aligns almost exactly with the Canadian 220 kPa specification: 220 kPa = 31.908 psi ≈ 32 psi. So US 32 psi and Canadian 220 kPa are essentially the same tire pressure expressed in different units, with only 0.632 kPa (0.092 psi) difference.
100 kPa = 100 × 0.14504 = 14.504 psi = 1.00 bar exactly = 100,000 Pa. This is an important reference: 100 kPa = exactly 1 bar (since 1 bar = 100,000 Pa and 1 kPa = 1,000 Pa, so 100 kPa = 100,000 Pa = 1 bar exactly). Standard atmosphere: 101.325 kPa = 14.696 psi. A tire at 100 kPa (14.5 psi) is dangerously flat for all passenger vehicle applications and well below any TPMS alert threshold.
500 kPa = 500 × 0.14504 = 72.519 psi = 5.00 bar = 500,000 Pa. This falls in the US residential water pressure range for high-pressure zones (the UPC maximum is 552 kPa / 80 psi). It is also in the range for European pneumatic systems (500-690 kPa = 72.5-100 psi). Road bicycle tire upper range: 620-896 kPa (90-130 psi). Useful shortcut: 500 kPa ≈ 72.5 psi, or about half of 1,000 kPa (145 psi).
Both measure pressure (force per unit area). kPa (kilopascal) is the metric SI unit: 1 kPa = 1,000 N/m squared = 1,000 Pa. PSI (pounds per square inch) is the US customary unit: 1 lbf per 1 in squared = 6,894.757 Pa. Key relationships: 1 bar = 100 kPa exactly. 1 atm = 101.325 kPa = 14.696 psi. 1 kPa ≈ 0.145 psi; 1 psi ≈ 6.895 kPa. Canada uses kPa for tire pressure and engineering. The US uses psi for consumer applications and kPa/MPa in engineering standards. 1 MPa = 1,000 kPa = 145.038 psi.
35 psi = 35 × 6.8948 = 241.317 kPa, rounded to 241 kPa. This is a common US SUV and light truck front tire specification. Converting for a cross-border vehicle: if the Canadian placard says 240 kPa, filling to 35 psi gives 241.3 kPa, just 1.3 kPa (0.2 psi) above the placard value, well within gauge accuracy. Canadian CUV tire specs: Honda CR-V (Canadian) typically specifies 240 kPa front = 34.8 psi; rounding to 35 psi is acceptable.
240 kPa = 240 × 0.14504 = 34.809 psi, rounded to 35 psi. This is a very common Canadian crossover and mid-size SUV front tire specification. Honda CR-V (Canadian spec): 240 kPa front, 240-250 kPa rear. Toyota RAV4 (Canadian): 240 kPa front and rear for standard load. At a US gas station: fill to 35 psi to match 240 kPa. The difference between 35 psi (241.3 kPa) and 34.8 psi (240 kPa) is 1.3 kPa (0.2 psi), well within the 2 psi (14 kPa) accuracy of typical gas station gauges.
1 MPa = 1,000 kPa exactly (SI prefix: Mega = 10 to the 6th, Kilo = 10 to the 3rd, so 1 MPa / 1 kPa = 1,000). Converting to psi: 1,000 kPa × 0.14504 = 145.038 psi. Also: 1 MPa = 10 bar exactly (since 1 bar = 100 kPa and 1 MPa = 1,000 kPa). Engineering reference: concrete design strength 28 MPa = 28,000 kPa = 4,061 psi. Structural steel A36 yield: 248 MPa = 248,000 kPa = 35,980 psi (approximately the A36 36,000 psi designation in kPa).
101.325 kPa = 101.325 × 0.14504 = 14.696 psi = 1.01325 bar = 1 standard atmosphere (atm). This is the exact definition of 1 standard atmosphere per BIPM: 101,325 Pa = 101.325 kPa. This is the baseline for converting between gauge pressure and absolute pressure: absolute = gauge + 101.325 kPa (14.696 psi) at sea level. A car tire at 220 kPa gauge = 220 + 101.325 = 321.325 kPa absolute = 46.6 psia. At altitude: atmospheric pressure is lower, so gauge and absolute pressures diverge more. At Denver (5,280 ft / 1,609 m): atmospheric = approximately 83.3 kPa (12.08 psia), so a 220 kPa gauge tire has 220 + 83.3 = 303.3 kPa absolute (44.0 psia). TPMS systems measure gauge pressure, so altitude does not affect the TPMS threshold directly.
700 kPa = 700 × 0.14504 = 101.526 psi = 7.00 bar. This is above the US 80 psi (552 kPa) residential water maximum, in the range of EU commercial appliance max inlet pressure (7 bar / 700 kPa). EU espresso machines operate at 8-9 bar (800-900 kPa). In the US: 700 kPa is within the range of shop air compressor output (90-125 psi = 620-862 kPa). A US air compressor outputting 101.5 psi delivers approximately 700 kPa to the connected air tools.
275 kPa = 275 × 0.14504 = 39.885 psi, rounded to 40 psi = 2.75 bar. This is within the Canadian full-size pickup truck and van tire specification range, where 275-310 kPa (40-45 psi) is common for light-load rear inflation. A Canadian Ford F-150 rear tire spec of 275 kPa (40 psi) aligns with the US F-150 rear spec of 40 psi. Natural gas medium-distribution pressure: 14-700 kPa; 275 kPa (39.9 psi) is at the upper boundary of medium-pressure distribution networks that feed commercial buildings and industrial facilities.
Yes, this converter uses Big.js arbitrary-precision arithmetic and exact definitions from both SI and NIST SP 811. 1 kPa = 1,000 Pa exactly (SI). 1 psi = 6,894.75729316836 Pa (NIST, from exact chain: 1 lbf = 0.45359237 kg × 9.80665 m/s²; 1 in² = 0.0254² m²). Exact results: 220 kPa = 31.9083 psi; 250 kPa = 36.2594 psi; 552 kPa = 80.0608 psi; 1,000 kPa = 145.0377 psi; 101.325 kPa = 14.6959 psi. Also: 1 bar = 100 kPa exactly (no rounding). Sources: NIST SP 811; BIPM.org; Transport Canada CMVSS; NPC 2020; PHMSA 49 CFR 192.
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This kPa to psi converter is provided for educational and informational purposes only. The conversion factor 1 kPa = 0.145037737730… psi is derived from the exact SI definition of kPa (1 kPa = 1,000 Pa) and NIST SP 811 definition of psi (1 lbf = 0.45359237 kg × 9.80665 m/s²; 1 in² = 0.0254² m²; 1 psi = 6,894.757 Pa). The relationship 1 bar = 100 kPa is exact. 1 atm = 101.325 kPa is exact per BIPM. All conversions use Big.js arbitrary-precision arithmetic. Canadian tire pressure values (220-250 kPa) are illustrative of typical specifications; always use the door-jamb placard value for your specific vehicle. TPMS thresholds reflect NHTSA FMVSS 138 (US, 25% below recommended) and Transport Canada CMVSS 110 (Canada). Residential water pressure limits (552 kPa UPC / 550 kPa NPC) reflect 2021/2020 code editions; verify local adoption. Pipeline pressure conversions (kPa to psi) are for educational context; licensed engineers must perform calculations for actual pipeline design and compliance. CPAP pressure data (cmH2O to kPa) is for informational context; CPAP prescription and settings must be determined by a licensed sleep medicine professional. The cmH2O-to-kPa conversion cited (1 cmH2O = 98.07 Pa = 0.09807 kPa) uses the international standard water density of 999.972 kg/m cubed at 4 degrees Celsius and standard gravity 9.80665 m/s squared. Natural gas pressure tiers are illustrative of typical North American distribution; always follow applicable gas utility and code requirements. Content reviewed by the USCalculators.com editorial team. References: NIST SP 811; BIPM.org; Transport Canada CMVSS 110; NPC 2020; NBC 2020; UPC 2021; IRC 2021; PHMSA 49 CFR 192; CSA B51; ASHRAE Fundamentals; SMACNA Duct Design; SAE J1297; ISO 4414; Canada Energy Regulator (formerly NEB).