Tools you might need next
Calculate Wilks score for powerlifting total relative to bodyweight. Free wilks score calculator for weightlifting, powerlifting, and gym programming.
Calculate total training volume for a lift or session. Free training volume calculator for weightlifting, powerlifting, and gym programming.
Calculate barbell plate loading for a target weight. Free plate loading calculator for weightlifting, powerlifting, and gym programming.
This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
1RM = Weight × (1 + Reps/30) — EpleyThe calculation requires: Weight Lifted, Reps Completed. Each parameter contributes to the final result according to the formula above. Accuracy depends on the precision of your input measurements.
Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
Check the expected unit for each input field (shown as suffix). Converting between imperial and metric units before entering values prevents calculation errors.
Ensure denominator values (divisors) are non-zero. The calculator validates this, but understanding which fields cannot be zero helps interpret results correctly.
Estimate your one-rep max from submaximal weight and reps. Free one-rep max (1rm) calculator for weightlifting, powerlifting, and gym programming. It applies the calculation formula (1RM = Weight × (1 + Reps/30) — Epley). For example: 225 lb × 5 reps — A typical use case demonstrating the calculator with representative values.