1 Rep Max Calculator

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Select a Formula
Epley: Good for higher rep ranges
Brzycki: Conservative, good for up to 10 reps
Lander: Suitable for athletes with more experience

Select Lift

Your 1 Rep Max (1RM) is the maximum amount of weight that you can lift for a single repetition of a given exercise. This calculator offers estimates using three different formulas. Consider trying each to find which one best matches your actual 1RM.

1RM Formulas - Uses

Formula	Qualities
Epley	Good for higher rep ranges Estimates 1RM based on weight and reps Widely accepted and commonly used
Brzycki	Conservative estimates, especially for up to 10 reps Good for beginners to intermediate lifters Can be more accurate for moderate rep ranges
Lander	Suitable for athletes with more experience Factors in the physiology of experienced lifters May provide a lower estimate for heavy singles

Knowing your One Rep Max (1RM) can help you set workout intensities based on percentage-based training methods. These estimates can guide your training program, but always listen to your body and consult with a fitness professional when attempting new maxes.

Read more about 1RM and its significance here.