About Workout Math Calculators

Last updated June 9, 2026

Training numbers are estimate numbers: a one-rep max predicted from a five-rep set, calories from MET tables, body fat from tape measurements. Each of those comes from a published formula with known limits, so this site names the formula it’s using and states the limits alongside the result.

The numbers covered

6 calculators: Running Pace Calculator, One Rep Max Calculator, Calories Burned Calculator, Race Time Predictor, Navy Body Fat Calculator, and Protein Intake Calculator.

Named formulas, visible disagreement

The one-rep-max page runs Epley and Brzycki side by side — they agree at low reps and drift apart above that, and seeing the spread is more honest than picking one and pretending it’s exact. The body-fat tool is the Navy tape method, presented with its margin of error rather than as gospel.

Estimates about bodies

Nothing here is medical, dietary, or training advice — talk to a qualified professional about your own body and health.

Challenge the math

If a pace table or formula here disagrees with its published source, email corrections@workoutmathcalc.com — sources get re-checked and pages corrected.