Every calculator, one place
Each runs entirely client-side — type your numbers and the answer updates instantly. Pair them with the Plan Builder and the Herculog app to put the numbers to work.
Plate Calculator
Enter a target weight and bar — see exactly which plates to load on each side, with a visual of the loaded barbell.
StrengthOne Rep Max Calculator
Estimate your 1RM from any set with the Epley and Brzycki formulas, plus a full percentage table for programming.
EffortRPE Calculator
Turn a weight, reps, and RPE into an estimated 1RM — and get the target loads to hit any rep count at any RPE.
PreparationWarmup Set Calculator
Enter your working weight and get a ramped warmup — sets, reps, and loads that prime you without burning energy.
PowerliftingWilks, DOTS & IPF GL
Enter squat, bench, and deadlift to score your total against bodyweight with the Wilks, DOTS, and official IPF GL formulas.
Free ToolPlan Builder
Build a full training plan in the browser — exercises, sets, reps, weights, RPE — and import it straight into the app.
From numbers to gains
Calculators tell you what to lift; Herculog remembers what you did. Log every set, track PRs, and watch strength climb — private, ad-free, on your device.