David: Founder of USCalculators.com Verified Expert
Meet the Author

David – Founder

Founder and Lead Calculator Developer: USCalculators.com
David is a pen name of Zeeshan Abbas.
MBA Finance MSc 20+ Years Experience 900+ Calculators Built Lab and CS Manager: Coats
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About

Who Is David?

David is the founder and lead calculator developer at USCalculators.com America’s largest free calculator library with over 900 tools covering construction, landscaping, health, auto, solar energy, math, education, and 90+ specialty trades and hobbies. Every calculator on this site was designed, coded, and verified by David or his team.

By day, David works as a Lab and Computer Systems Manager at Coats a FTSE 250 global industrial thread and yarn manufacturer with 18,000+ employees across 50 countries. His professional background spans 20+ years in finance, data systems, laboratory operations, and process management: disciplines that directly inform how he builds calculators: with precision, accuracy, and a respect for what can go wrong when the math is off.

He holds an MBA in Finance from the University of Engineering and Technology (UET) Lahore and an MSc from the University of Karachi. That quantitative foundation shapes every formula on this site: from ACI 318 concrete standards to CDC BMI guidelines to IRS solar tax credit rules.

Why USCalculators.com Exists

David built this site after years of noticing the same problem: existing online calculators for the US market either defaulted to metric units, missed critical US-specific standards, or produced results without any explanation of the underlying math. A landscaper needing cubic yards got cubic meters. A homebuilder needing ACI 318 guidance got a generic volume formula. He built USCalculators.com to fix that: one calculator at a time, all in American units, all referencing actual US regulatory and industry standards.

The Build Methodology

Before writing a single line of code for any calculator, David studies the top 10 existing tools for that calculation, identifies every missing feature, and builds all of them into the new version. The result is consistently more comprehensive than what you find elsewhere. Every tool uses Big.js precision arithmetic to eliminate floating-point errors, includes a PDF export, and is tested against known reference values before publishing.

Areas of Expertise

What David Builds, and Knows Cold

Construction and Concrete
ACI 318 standards, cubic yard estimation, footing depths, rebar spacing, asphalt and masonry math
Landscaping and Lawn
Mulch cubic yards and bags, gravel tonnage, sod coverage, irrigation run times, US soil and material standards
Health and Fitness Metrics
CDC BMI guidelines, TDEE and macro calculations, military fitness standards, pregnancy health benchmarks
Solar Energy and ITC
Panel sizing, 30% federal tax credit math, off-grid battery banks, RV solar, net metering by US state
US Imperial Conversions
Feet, inches, gallons, pounds, Fahrenheit: all 100+ unit converters built to US Imperial standards with no metric defaults
DIY and Home Improvement
Drywall, flooring, paint, roofing, framing: all built around US sheet and bag sizes with waste factors
Auto and RV
MPG, towing capacity, tire size, payload limits, gear ratios, road trip cost, and RV solar planning
Specialty Trades
CDL trucking, machining feeds and speeds, rigging OSHA limits, ballistics, aviation, HVAC BTU: 90+ specialty hubs
Web Development and SEO
Vanilla JavaScript, Big.js precision arithmetic, JSON-LD schema, WordPress, technical SEO, and E-E-A-T architecture
Featured Tools

Popular Calculators Built by David

Mulch Calculator: Cubic Yards, Bags and Cost
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Concrete Slab Calculator: ACI 318 Standard
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Adult BMI Calculator: CDC Weight Categories
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TDEE Calculator: Total Daily Energy Expenditure
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Tip Calculator and Bill Splitter
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Topsoil Calculator: Cubic Yards and Bags
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Drywall Calculator: Sheets and Screws
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Thanksgiving Turkey Calculator: Pounds Per Person
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MPG Calculator: Gas Mileage and Cost
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Editorial Standards

How Every Calculator Is Built

David’s methodology: Every calculator on USCalculators.com starts with a structured competitor audit: studying the top 10 existing tools for that calculation, identifying every feature gap, and building all missing features into the new version. Mathematical formulas are sourced from primary US standards: ACI 318 for concrete, ASTM for materials, CDC and NIH for health metrics, IRS publications for tax calculations, and USDA for agricultural tools. All arithmetic uses Big.js precision library to eliminate floating-point errors. Results are tested against known reference values before publishing. Every major calculator includes PDF export and WhatsApp sharing. Content is updated when US standards, pricing averages, or regulations change. David specializes in US Imperial unit calculations, construction math, landscaping estimating, health benchmarks, and solar energy ROI, and has been actively building and publishing US calculator tools since 2025.