1RM Calculator

Free 1rm calculator — get instant, accurate results. No sign-up required.

Enter Your Details

Weight Liftedkg

Reps Completedreps

Estimated 1RM

~113 kg

90% 1RM

101 kg

80% 1RM

90 kg

70% 1RM

79 kg

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What Is the 1RM Calculator?

The 1RM Calculator is a free online tool for strength & muscle planning. Enter your details above to get instant personalised results.

How to Use It

Fill in the fields and your result will update instantly. No account needed.

Why It Matters

Tracking the right metrics is one of the most effective ways to make consistent progress toward your health and fitness goals.

This tool provides estimates for informational purposes only. Results are based on general formulas and may not reflect individual circumstances. Consult a qualified professional for personalised advice.