# Fitness & Sports Calculators

- **URL:** https://codeasystem.com/calculators/fitness/
- **Markdown index:** https://codeasystem.com/calculators/fitness/index.md
- **Calculators in this category:** 7

Fitness and sports calculators for running pace, race predictions, one-rep maxes, target heart rate and calorie burn.

Focus areas: Pace, lifting maxes, heart rate and calorie burn.

## All calculators
- [One-Rep Max Calculator](https://codeasystem.com/calculators/fitness/one-rep-max-calculator.md); Estimate your one-repetition max from any set of 1–12 reps, with Epley as the primary formula and Brzycki for comparison.
- [Running Pace Calculator](https://codeasystem.com/calculators/fitness/running-pace-calculator.md); Convert a distance and duration into running pace in min/km or min/mile, with average speed in km/h alongside.
- [Race Time Predictor](https://codeasystem.com/calculators/fitness/race-time-predictor-calculator.md); Predict finish times at new race distances from a recent result using the Riegel formula; from 5K through the marathon.
- [Calories Burned Calculator](https://codeasystem.com/calculators/fitness/calories-burned-calculator.md); Estimate exercise energy expenditure from activity MET values, body weight and duration using the Compendium of Physical Activities.
- [Target Heart Rate Calculator](https://codeasystem.com/calculators/fitness/target-heart-rate-calculator.md); Compute Karvonen training zones from your age and resting heart rate, with HRmax estimated by the Tanaka equation.
- [VO2 Max Calculator](https://codeasystem.com/calculators/fitness/vo2-max-calculator.md); Estimate VO₂max from a Cooper 12-minute run test, with approximate fitness bands for interpreting the result.
- [Steps to Calories Calculator](https://codeasystem.com/calculators/fitness/steps-to-calories-calculator.md); Convert daily steps into distance walked and rough calories burned using stride length and body weight, documented as an approximation.

Each link above points to the full Markdown reference for that calculator (inputs, formula, worked example, FAQs). The interactive HTML version lives at the same path without the `.md` suffix.

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Last updated: 2026-08-23 · [Section overview](https://codeasystem.com/calculators/index.md)