1RM Calculator
Your strength training tool
1RM Calculator launched on April 12, 2025 with 8 votes and more than 50% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Calculate your one-rep maximum (1RM) with our easy-to-use calculator. Get accurate estimates using multiple formulas.
Free 1RM calculator for bench press, squat, and deadlift. Compare proven formulas, then measure barbell velocity and video-based 1RM in Power VBT.
Record or import a set to measure rep-by-rep concentric velocity and bar path. Build a load–velocity profile for a more personal 1RM. Estimate your one-rep maximum with proven formulas. Also calculate Rep Max and Percentages of 1RM. 100 kg is a useful estimate. Power VBT turns your lifting video into rep velocity, bar path, and a training record. Each formula below is shown with the same input: 100 kg lifted for 5 reps. The spread between formulas is the point. Working weights derived from a 100 kg one-rep maximum. Treat them as starting points, not tested limits. Use a recent working set with consistent technique. The closer the set is to failure, the more useful the estimate usually…from maxrep.net
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