Free Strength Training Calculators
Quick calculators for the numbers lifters need between sets. They run in your browser, with no account needed.
One Rep Max Calculator
Estimate your one-rep max from any set using the Epley and Brzycki formulas, then get a percentage chart for planning training weights.
Open calculatorRPE & RIR Chart
Convert RPE to reps in reserve, see %1RM for every rep and RPE combination, and work out the weight for your next set.
Open calculatorPlate Calculator
Find exactly which plates to load on each side of the bar, in pounds or kilograms, with your own bar weight and plate set.
Open calculatorWarm-Up Calculator
Build warm-up sets that ramp up to your working weight, rounded to loadable weights with plates per side.
Open calculatorFree training programs
Full plans with exercises, sets, rep ranges, and effort targets, ready to use with the calculators above.
Want the plan, not just the numbers?
Gainr builds weekly Coach plans around your goals, schedule, and equipment, and tracks every set you log.
Free logging and progress charts · 14-day Coach preview