One-Rep Max (1RM) Strength Calculator

Calculate maximum single-rep lift (1RM) using Epley and Brzycki formulas plus workout percentage training zones.

  • 100% free
  • Private in browser
  • No signup
  • No watermarks
Estimated 1RM (Epley Formula)
263
Estimated 1RM (Brzycki Formula)
253
85% 1RM Heavy Strength Target
219
70% 1RM Hypertrophy Volume Target
180

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About One-Rep Max (1RM) Strength Calculator

Calculate maximum single-rep lift (1RM) using Epley and Brzycki formulas plus workout percentage training zones.

How to use One-Rep Max (1RM) Strength Calculator

  1. Enter your required input values into the fields.
  2. View the automatically calculated results in real time.

Key features

  • Instant client-side calculation
  • Real-time updates without page reloads
  • Private and secure: zero data leaves your browser

Frequently asked questions

Is this calculation free and private?
Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.