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Calculators
Strength & Body
Composition Tools
Every calculator includes clinical context you won't find on other sites — because the person who built them is both a Registered Nurse and a 20-year powerlifter.
1RM Calculator
Estimate your one rep max from a submaximal set with the Epley, Brzycki, or Lombardi formula, plus a full percentage chart.
Open CalculatorBody Fat Calculator
U.S. Navy method body fat estimate from circumference measurements. No equipment beyond a tape measure.
Open CalculatorDOTS Calculator
The modern powerlifting score. Compare your total to lifters of any bodyweight.
Open CalculatorWilks Calculator
The classic powerlifting score behind decades of best-lifter awards and records.
Open CalculatorRPE to Percentage Chart
Interactive reference chart converting Rate of Perceived Exertion to estimated %1RM across rep ranges.
Open Calculator