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Strength Calculator

Estimate your one-rep max from a recent set, then see how your strength compares to general population standards for your bodyweight — for squat, bench press, deadlift, and overhead press.

FITNESS & MILITARY · CALCULATOR

Strength Calculator

Estimated 1RM 0 lb
Ratio to Bodyweight 0.00x
Strength Level -

How to Use the Strength Calculator

  1. Select your lift (squat, bench press, deadlift, or overhead press).
  2. Select your sex and enter your bodyweight.
  3. Enter the weight you lifted and how many reps you completed with it.
  4. Click "Calculate Strength Level" to see your estimated one-rep max, bodyweight ratio, and general strength classification.

How This Is Calculated

Your one-rep max (1RM) is estimated using the Epley formula, one of the most widely used methods for predicting max strength from a submaximal set:

1RM = Weight Lifted × (1 + Reps ÷ 30)

Your 1RM is then divided by your bodyweight to get a ratio, which is compared against general population-based bodyweight-ratio benchmarks (novice, intermediate, advanced, elite) for your selected lift and sex.

Frequently Asked Questions

How accurate is the Epley formula?
It's a widely used estimate, most accurate for rep ranges under about 10. Very high rep sets (15+) tend to produce less reliable 1RM estimates.

Are these strength standards official?
No — they're general population-based reference ranges commonly used across fitness calculators, not an official governing body's standard. Individual results vary based on training history, limb length, technique, and other factors.

Should I actually attempt a true 1-rep max to test this?
Not necessarily, especially without a spotter or coach — using a formula-based estimate from a safer, lower-risk set is generally the recommended approach for most lifters rather than testing a true max frequently.

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Disclaimer: This calculator provides general estimates for educational purposes only and is not a substitute for guidance from a qualified coach or medical professional. Always use proper form and appropriate safety measures (spotters, safety bars) when attempting heavy lifts.

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