Tools
Fitness Calculators
Frequently asked questions
- Which fitness calculators does Exsercise.com offer?
- One-rep max (Epley/Brzycki), plate loading, BMI (WHO adult), protein intake (g/kg), Navy body-fat estimate, heart-rate zones, RPE and rest, and running pace.
- Are the calculators free to use?
- Yes. They are free web tools for practical workout and body-composition planning, with formula explanations on each page.
Browse fitness calculators
One-Rep Max Calculator
Estimate 1RM from a submaximal set with Epley and Brzycki formulas.
Plate Loading CalculatorConvert a target barbell weight into plates per side, or reverse-total a loaded bar — with a companion how-to guide.
BMI CalculatorAdult Body Mass Index with the WHO kg/m² formula, category ranges, and a companion how-to guide.
Protein Intake CalculatorBodyweight-based daily protein targets for common training goals, with a companion g/kg guide.
Body Fat CalculatorU.S. Navy / Hodgdon–Beckett circumference estimate, with a companion how-to guide.
Heart Rate Zones CalculatorTarget training zones with Tanaka/Fox max HR and Karvonen heart-rate reserve.
RPE & Rest CalculatorMap reps × RPE to %1RM, estimate e1RM or target loads, and pick between-set rest times — with a companion rest guide.
Running Pace CalculatorConvert between pace, finish time, and distance for running or walking (km or miles).