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Calcimator

One Rep Max (1RM) Calculator

Estimate your one-rep max for any lift based on weight and reps. Get a training percentage chart for programming your workouts.

Inputs

lbs

Results

Estimated 1RM (Epley)

215.8 lbs

Brzycki Estimate208.1 lbs
Lander Estimate210.4 lbs

Estimated 1RM (Epley)

215.8 lbs

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Weight Lifted — Body weight in the selected unit. Accepts values from 1 lbs to 2,000 lbs (default: 185 lbs).
  3. Reps Performed — Number of repetitions performed. Accepts values from 1 to 30 (default: 5).
  4. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  5. Estimated 1RM (Epley) — shown as a numeric value. This is the primary result of this calculator.
  6. Brzycki Estimate — shown as a numeric value.
  7. Lander Estimate — shown as a numeric value.
  8. View the Training Percentages below for a visual breakdown of how the numbers relate to each other.
  9. Check the Training Chart for a detailed row-by-row breakdown. This is useful for spotting trends or finding values at specific points.
  10. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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