Weightlifting Calculator
Use this free weightlifting calculator to estimate your one-rep max, training percentages and plates per side.
Health information notice: Results are estimates based on general formulas and may not reflect individual circumstances. This tool is not a diagnosis or substitute for personalized advice from a qualified healthcare professional.
How the weightlifting calculator works
The 1RM averages the Epley and Brzycki formulas. Plates per side are calculated for a 45 lb (20 kg) bar.
Frequently asked questions
How do I use the percentages?
Train around 70–90% of your 1RM for most working sets, depending on your goal.
Results are estimates for general information only. They are not a substitute for professional advice where applicable. Found a mistake? Report an error.