Frequently Asked Questions
What is 1RM?
1RM (One Rep Max) is the maximum weight you can lift for a single repetition with proper form. It serves as a benchmark for measuring strength.
Is it safe to test my actual 1RM?
Directly testing your 1RM carries a higher injury risk. Estimating from multiple reps is safer and nearly as accurate, especially when using 10 or fewer reps.
Which formula is used?
This calculator uses the Epley, Brzycki, and Lander formulas, which are well-validated for estimating 1RM from submaximal loads.
Updated 2026 — WHO standards