# Sports & Fitness calculators

> Pace, race-time prediction, calories burned, one-rep max, VO2 max, steps and cycling.

8 calculators. HTML index: https://tttkmbb.com/fitness · JSON: https://tttkmbb.com/api/v1/calculators?category=fitness

- [Running Pace Calculator](https://tttkmbb.com/fitness/running-pace.md): Computes running pace in min/km and min/mile and speed in km/h and mph from a distance and elapsed time, and projects the finish time for 5 km, 10 km, half marathon and marathon at that constant pace. Tool: `calculate_running_pace`.
- [Race Time Predictor](https://tttkmbb.com/fitness/race-time-predictor.md): Predicts finish times for 5 km, 10 km, half marathon and marathon from one known race result using Riegel's endurance formula T2 = T1 × (D2/D1)^1.06, with the corresponding paces. Tool: `predict_race_time`.
- [Calories Burned Calculator](https://tttkmbb.com/fitness/calories-burned.md): Estimates the calories burned during an activity from body weight, duration and the activity's MET value from the 2011 Compendium of Physical Activities, using the ACSM metabolic equation kcal/min = MET × 3.5 × kg / 200. Tool: `estimate_calories_burned`.
- [One-Rep Max Calculator](https://tttkmbb.com/fitness/one-rep-max.md): Estimates the one-repetition maximum from a weight lifted for 2–12 repetitions using the Epley, Brzycki and Lombardi equations, reports their average, and lists training loads at 95 % to 70 % of that 1RM. Tool: `estimate_one_rep_max`.
- [VO2 Max Calculator](https://tttkmbb.com/fitness/vo2-max.md): Estimates maximal oxygen uptake (VO2max, ml/kg/min) from the distance covered in the Cooper 12-minute run test, and/or from the ratio of maximum to resting heart rate (Uth et al. 2004). Tool: `estimate_vo2_max`.
- [Steps to Distance Calculator](https://tttkmbb.com/fitness/steps-to-distance.md): Converts a pedometer step count into distance using a measured stride length, or a walking stride estimated from height (stride ≈ 0.414 × height). Tool: `convert_steps_to_distance`.
- [Swim Pace Calculator](https://tttkmbb.com/fitness/swim-pace.md): Computes swimming pace per 100 metres and per 100 yards, speed in m/s and km/h, and the number of 25 m and 50 m pool lengths from a swum distance and time. Tool: `calculate_swim_pace`.
- [Pace Converter](https://tttkmbb.com/fitness/pace-converter.md): Converts a running pace or speed given in any one of min/km, min/mile, km/h or mph into all four units, plus seconds per km/mile and metres per second. Tool: `convert_running_pace`.