One Rep Max (1RM) Calculator | Calculate Your Maximum Lift

One Rep Max (1RM) Calculator

Calculate the maximum weight you can lift for a single repetition based on your working sets.

Your Estimated One Rep Max

0 lbs

Common Training Percentages

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What is One Rep Max (1RM)?

One Rep Max (1RM) is the maximum weight you can lift for a single repetition of an exercise with proper form. It's a key metric for strength training and program design.

How to Use This Calculator

1. Enter the weight you can lift for multiple reps
2. Input the number of reps you can perform
3. Select your preferred unit (lbs/kg)
4. Click calculate to see your estimated 1RM

Training Tips

• Don't test your 1RM too frequently
• Always warm up properly
• Maintain proper form
• Use a spotter when necessary