Strength calculator
Estimate your one rep max without maxing out.
Enter the weight you lifted and the reps completed. This tool estimates your one rep max, shows training loads by percentage, and gives a single target rep recommendation for each percentage.
Enter your lift
Best used with sets between 2 and 10 reps. Very high-rep sets become less accurate.
Use a clean set with consistent form. Do not use forced reps.
Your results
Enter your lift and click calculate. Your estimated one rep max, percentage chart, and target reps will appear here.
Need help pricing your training sessions?
Use the trainer rate calculator to estimate what you need to charge based on income goals, gym cuts, expenses, and no-shows.