Estimate your one-repetition maximum and training percentages from weight lifted and repetitions completed.
Version 1.0 · Last Updated: August 5, 2026 · Maintained by ToolLarder
For a useful estimate, enter the weight and reps from one near-failure set completed with good form.
Enter weight and repetitions, then calculate.
The 1RM value is an estimate. Attempt maximal loads with proper technique, suitable safety equipment, and a spotter when needed.