1RM Calculator

Calculate your one-rep max for any lift and see your training weight percentages.

✓ Free to use ✓ Instant results ✓ Mobile friendly ✓ No sign-up needed

Weight Lifted (kg)

Reps Performed

Estimated 1RM

90% (strength)

80% (power)

70% (hypertrophy)

🏋 Gear up for big lifts

How 1RM is Calculated

1RM is estimated from submaximal lifts using the Epley formula: 1RM = weight × (1 + reps/30). Other formulas include Brzycki and Lombardi.

What percentage of 1RM should I use for hypertrophy?+

70–85% of 1RM for 6–12 reps is the hypertrophy sweet spot.

Is it safe to test my actual 1RM?+

For beginners, estimated 1RM from submaximal lifts is safer. True 1RM testing should be done with a spotter.