Free US Calculators
Built in American Units
for Every Trade and Hobby
Cubic yards, gallons, feet, Fahrenheit, every calculator on this site runs in the measurements Americans actually use. No metric conversion required. No sign-up. No cost. Ever.
Every Calculator Category, Organized for You
Browse by trade, hobby, or topic. Every category is a hub page with its own set of specialized tools built around US standards and measurements.
How Every Calculator Works in Four Steps
Search by name, browse by category, or open a category hub. 900+ tools cover every US trade, hobby, and daily-life calculation need.
Type in your real-world numbers, feet, inches, gallons, pounds. Every input field uses American units. No converting to metric first.
Results calculate in real time in your browser. Your numbers never leave your device. No server, no wait, no data sharing.
Download a branded PDF report or share results directly via WhatsApp. Available on every major calculator, no account required.
Trade, Hobby, and Industry Calculators: 78 Specialty Hubs
Truckers, pitmasters, divers, machinists, and beekeepers all run their own numbers. Each hub below holds the tools for one craft, built on the US codes and units that trade actually uses.
Building Trades and Property
Codes, loads, and materials for contractors, facility teams, and site engineers.
- HVAC and Refrigeration5 tools
- Plumbing6 tools
- Insulation5 tools
- Siding and Exterior5 tools
- Pool and Spa5 tools
- Elevator Mechanics5 tools
- Facility Management5 tools
- ADA Accessibility5 tools
- Land Surveying5 tools
- Geotechnical5 tools
- Wastewater and Septic5 tools
- Traffic Engineering5 tools
- Fire Hydraulics5 tools
Energy, Industry and Shop
Field math for drilling crews, machinists, inspectors, and electronics benches.
Transport and Logistics
Weights, routes, fuel, and freight for drivers, pilots, and shippers.
Food and Drink Craft
Ratios, yields, and timing for pitmasters, bakers, brewers, and roasters.
Farm, Garden and Nature
Planting, livestock, weather, and land tools tuned to US growing zones.
Outdoors and Sports
Gear, safety margins, and performance math for the field, the trail, and the course.
Arts, Media and Hobbies
Precision tools for makers, performers, collectors, and studio pros.
- 3D Printing5 tools
- Tabletop Gaming5 tools
- Music5 tools
- Acoustics10 tools
- Ham Radio5 tools
- Ceramics and Pottery5 tools
- Weaving5 tools
- Leathercraft5 tools
- Gemology5 tools
- Watch and Clock Repair5 tools
- Cosmetics Formulation5 tools
- Taxidermy5 tools
- Print Production5 tools
- Stagecraft5 tools
- Film Grip and Rigging5 tools
- Amusement Rides5 tools
- Art Conservation5 tools
Built Differently from Every Other Calculator Site
Most calculator sites are built to attract search clicks, not to actually solve your problem. We started from the opposite direction.
Every calculator on this site was designed from the ground up in feet, inches, pounds, gallons, and Fahrenheit. You will never need to convert your measurements to metric before entering them.
Before writing a single line of code, we study the top 10 existing tools for that calculation, find what they are missing, and build every missing feature into our version. The result is consistently more complete than what you will find anywhere else.
Take your estimates to the job site, share them with a contractor, or save them for your records. A branded, printable PDF report is one click away on every significant calculator on this site.
Every calculation runs locally in your browser using JavaScript. The dimensions, quantities, and personal figures you enter never leave your device, are never stored on our servers, and are never shared with anyone.
We use Big.js precision arithmetic to eliminate the floating-point errors that plague basic JavaScript calculators. When your concrete estimate says 3.33 cubic yards, it means exactly that, not some rounded approximation that gets you a half-bag short at the store.
Every calculator comes with a thorough guide written by someone who understands the trade or hobby, covering the formulas, the US-specific rules, worked examples from real American cities, and expert tips that save you from the most common mistakes.
The Calculator You Need Is Already Here
900+ free tools built for American measurements, American trades, and American life. No account required. No metric conversions. No cost.