1RM Calculator

Calculate your one-rep max and discover your optimal training weights for any rep range. Perfect for planning your strength training program.

How to Use This Calculator

  1. 1.Enter the weight you lifted for multiple reps
  2. 2.Enter the number of reps you completed (1-30)
  3. 3.Choose a calculation formula (Brzycki is recommended)
  4. 4.View your estimated 1RM and percentage table

Note: These are estimates. Your actual 1RM may vary based on training experience, technique, and individual factors. Always prioritize safety when attempting heavy lifts.

Formula Comparison

Brzycki Formula

Most accurate for 2-10 reps. Best general-purpose formula.

Epley Formula

Optimal for low reps (2-5). Popular among powerlifters.

Lander Formula

Accounts for body weight. Good for compound movements.

Average Formula

Combines all formulas for balanced estimation.

Safety Tips for Testing Your 1RM

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Proper Warm-Up

Always warm up thoroughly with progressive loads before attempting heavy lifts

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Use a Spotter

Never attempt a true 1RM without an experienced spotter or safety equipment

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Progress Gradually

Build up to heavy weights over time and listen to your body