Gym Strength Calculators
Free, mobile-friendly tools for the gym maths you'll do again and again in your workouts. Each calculator does one thing well, is designed for mobile browsers, and never asks for an email to use. Pro tip: in your browser, Share this page and Add to Home Screen for quick access.
1RM calculator
Free 1RM calculator using all seven major formulas (Epley, Brzycki, Lander, Lombardi, Mayhew, O'Conner, Wathen) plus an averaged result.
Load–velocity profile
Create your own load–velocity profile from velocity-based training data.
Max power calculator
Find the load and velocity that produces peak mechanical power output on any of your lifts.
Plate loading calculator
Solve the gym math instantly — "how do I get 117.5 kg on the bar?" Fastest plate combinations for any target weight, kg or lb, with bar weight and gym plate inventory accounted for.
RPE → velocity
Find the last-rep velocity that matches each RPE value on your lifts.
RPE calculator
Free RPE calculator.
Warm-up calculator
Free warm-up calculator.