Sports

One-Rep Max Calculator

Estimate your 1RM from a weight and reps (Epley formula).

Calculated Output

Estimated 1RM 215.83

90% of 1RM 194.25

Formula: 1RM = weight × (1 + reps ÷ 30)

Step-by-Step Breakdown

1. Values used:

2. Weight lifted = 185

3. Reps performed = 5

5. Estimated 1RM = 215.83

6. 90% of 1RM = 194.25

Did this calculator solve your problem today?

The math behind it

Epley formula: 1RM = weight × (1 + reps ÷ 30). Most accurate for reps under ~10.

185 lb × 5 reps → ~216 lb.

Should I test a true 1RM?

Estimating is safer — true 1RM attempts carry higher injury risk.