6 free workout math calculators
The math behind your training.
Free, no-signup workout math — pace, one-rep max, calories burned, race-time predictions, body-fat estimate, and protein targets. Every formula shown, all estimates (not medical advice).
Running Pace Calculator
Pace, finish time, and speed (mi or km)
Calculate paceOne Rep Max Calculator
Estimate your 1RM from reps
Estimate 1RMCalories Burned Calculator
MET-based estimate for any activity
Estimate caloriesRace Time Predictor
Predict your time at another distance
Predict race timeNavy Body Fat Calculator
Tape-measure body-fat estimate
Estimate body fatProtein Intake Calculator
Daily protein range for your training
Calculate proteinGuides
Plain-English explainers: how to estimate your one-rep max, predict your race time, and how much protein you really need.