Fitness & Training
4 free calculators & converters. Every tool runs entirely in your browser — nothing you type is uploaded.
Available calculators
One Rep Max (1RM) Calculator
Free one rep max (1RM) calculator. Enter a weight you lifted and how many reps you did to estimate your theoretical 1RM. Supports multiple formulas.
VO2 Max Calculator
Estimate your VO2 max (maximal oxygen uptake) from age, resting heart rate, or distance performance. Cardiovascular fitness indicator.
Pace Calculator
Instantly convert running pace between minutes per mile, minutes per kilometer, miles per hour, and kilometers per hour. Perfect for runners and cyclists.
Race Time Predictor
Predict your 5K, 10K, half-marathon, and marathon times from any recent race using the proven Riegel formula. Works for all distances and paces.
About the Fitness & Training
All 4 free fitness & training calculators and converters at mQuickCalc Health. No sign-up, no email, no data collected. The tool runs entirely in your browser, so nothing you enter is uploaded or stored.
Choosing the right tool
- One Rep Max (1RM) Calculator — Free one rep max (1RM) calculator. Enter a weight you lifted and how many reps you did to estimate your theoretical 1RM. Supports multiple formulas.
- VO2 Max Calculator — Estimate your VO2 max (maximal oxygen uptake) from age, resting heart rate, or distance performance. Cardiovascular fitness indicator.
- Pace Calculator — Instantly convert running pace between minutes per mile, minutes per kilometer, miles per hour, and kilometers per hour. Perfect for runners and cyclists.
- Race Time Predictor — Predict your 5K, 10K, half-marathon, and marathon times from any recent race using the proven Riegel formula. Works for all distances and paces.
For general information only, not medical advice — see our disclaimer.
Frequently asked questions
How do I calculate my one-rep max?
Use the Brzycki formula: 1RM = weight / (1.0278 - 0.0278 x reps). If you lift 80 kg for 5 reps, your estimated 1RM is about 93 kg. The 1RM calculator handles multiple formulas.
How do I convert running pace between units?
Pace conversion: min/mile x 1.609 = min/km. An 8-minute-mile pace is about 4:58 min/km. The pace calculator converts between min/mile, min/km, mph and kph.
How do I predict my race time for a different distance?
Use the Riegel formula: T2 = T1 x (D2/D1)^1.665. If you run a 5K in 25:00, your predicted 10K time is about 52:40. The race predictor handles multiple formulas.