About Us
About EveryCalcPro
Free, verified calculators built on authoritative sources — for builders, gardeners, fitness enthusiasts, and everyone in between.
Who Builds This Site
Khan
Khan is the founder and developer of EveryCalcPro.com. With hands-on experience in residential construction, landscaping, and digital tool development, Khan built this platform to solve a specific problem: finding a reliable, code-referenced calculator for real projects without expensive software subscriptions.
Every calculator on this site is built from primary sources — not from other calculator websites. All formula methodology has been published and assigned a permanent DOI through Zenodo, the open-access repository operated by CERN and the European Commission.
ORCID: 0009-0007-2819-8353
EveryCalcPro by the Numbers
What We Cover
Construction
Roof pitch, rafter length, concrete, footings, retaining walls — all referenced to IRC 2021 and AWC standards.
Landscaping
Topsoil, gravel, soil weight, garden beds, and lawn calculators — verified against USDA NRCS and ASTM data.
Health & Fitness
Calorie burn, BMR, body fat, macronutrients — based on FDA constants, WHO guidelines, and peer-reviewed MET values.
Military
Army and Navy body composition calculators following AR 600-9 and MILPERSMAN 6110-120 official protocols.
Finance & Tax
Texas paycheck calculator based on current IRS Publication 15-T withholding tables. Tip calculators for US and UK.
Utility
Date, time, IP subnet, unit conversion, and weight calculators — built on international BIPM and ISO standards.
Our Authoritative Sources
We do not copy formulas from other calculator sites. Every formula traces back to a primary source:
- IRC 2021 (International Residential Code) — construction span tables, framing requirements codes.iccsafe.org
- AWC — American Wood Council, Span Tables for Joists and Rafters, DCA6 Deck Guide awc.org
- ASCE 7-22 — Minimum Design Loads (snow load formula) asce.org
- ACI 318-19 — American Concrete Institute, structural concrete code
- USDA NRCS — soil bulk density and nutrient data nrcs.usda.gov
- ASTM D448 — aggregate size classification (defines #57 stone, etc.)
- FDA Nutrition Labeling — calorie constants (protein 4 kcal/g, fat 9 kcal/g)
- USDA FoodData Central — nutrient database fdc.nal.usda.gov
- WHO & AHA — sodium, dietary fat, and nutrition guidelines
- Compendium of Physical Activities (2011) — MET values for exercise calculators
- AR 600-9 — US Army body composition program
- MILPERSMAN 6110-120 — US Navy physical readiness program
- IRS Publication 15-T — federal income tax withholding tables
- NIST Handbook 44 — unit conversion constants nist.gov
- Zenodo DOI: 10.5281/zenodo.22735157 — published calculator methodology doi.org
Our Mission
EveryCalcPro exists to give everyone — DIY homeowners, builders, gardeners, athletes, and military members — access to the same accurate calculation tools that professionals use, completely free, with transparent sources.
We believe a calculator is only as good as the formula behind it. That is why every result on this site links back to the standard, regulation, or peer-reviewed research that defines it.
All calculators are free. No registration. No subscription. No ads that compromise accuracy.
Questions or corrections? Email us at everycalcpro@gmail.com