About SportCalc

SportCalc is a free collection of 64+ sports and fitness calculators built to be fast, accurate, and genuinely useful — no signups, no clutter, instant results.

What we do

We build focused, single-purpose calculators across 4 areas: running and endurance, strength and fitness, cycling and triathlon, and ball and team sports. Each tool does one job well, shows its working where it helps, and runs entirely in your browser.

How our calculators work

Every calculator is based on an established, published formula or method — for example the Riegel race-prediction model, the Mifflin–St Jeor equation for energy expenditure, the Daniels–Gilbert VO2 estimate, the U.S. Navy body-fat method, Coggan power zones, and the Wilks coefficients for powerlifting. We test each formula against known reference values before it goes live.

Our principles

• Accuracy first. Results are estimates, but they are grounded in recognised methods and validated against references.
• Speed and privacy. Calculations happen in your browser. We do not require accounts and we do not need your data to give you an answer.
• Clarity. Each tool explains how to use it, what the result means, and answers common questions.

Contact

Spotted an error or want a tool added? We would love to hear from you — visit our contact page.