Question 1

What is a 1RM calculator?

Accepted Answer

A 1RM (one-rep maximum) calculator estimates your maximum strength for a single repetition of an exercise based on submaximal lifts. It uses scientifically validated formulas to predict your 1RM without actually attempting a maximum lift.

Question 2

Which 1RM formula is most accurate?

Accepted Answer

The Brzycki formula is most widely used and accurate for 2-10 reps. Epley works well for 1-6 reps, while Lander is better for 6-10 reps. The best formula depends on your rep range and individual response to training.

Question 3

How do I use the 1RM calculator?

Accepted Answer

Enter the weight you lifted and the number of reps performed, then select your preferred formula. The calculator will estimate your 1RM and show results from all formulas for comparison.

Question 4

Are 1RM calculators accurate?

Accepted Answer

1RM calculators provide estimates that are generally accurate within 5-10% for most people. Accuracy depends on factors like training experience, technique, and the specific rep range used for the calculation.

1RM Calculator

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