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One-Rep Max Calculator

Estimate your 1RM using Epley, Brzycki, and Lombardi formulas with a practical percentage table.

Lift Inputs

1RM Estimate

115.5 kg

Epley 116.7 kg · Brzycki 112.5 kg · Lombardi 117.5 kg

PercentTraining weight
40%46.2 kg
50%57.8 kg
60%69.3 kg
70%80.9 kg
75%86.7 kg
80%92.4 kg
85%98.2 kg
90%104 kg
95%109.8 kg

Formulas: Epley (1985), Brzycki (1993), Lombardi (1989).

Method

Compares Epley, Brzycki, and Lombardi equations, then reports a blended estimate for programming.

Method source

How To Use This Calculator

  1. Set your inputs with real body or training data.
  2. Confirm metric or imperial units, then run the calculation.
  3. Review the output ranges and method assumptions before deciding.
  4. Re-run with conservative and aggressive assumptions to compare outcomes.
  5. Save your assumptions with a shareable URL, then compare one conservative and one aggressive scenario before acting.

Frequently Asked Questions

Which formula is used here?

Compares Epley, Brzycki, and Lombardi equations, then reports a blended estimate for programming.

Can I use metric or imperial units?

Yes. This tool supports both metric and imperial units and remembers your preference.

Is this medical advice?

No. This tool provides general fitness estimates and should not replace medical guidance.

Is this tool free and private to use?

Yes. AI Fit Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.

Do these tools replace medical guidance?

No. These outputs are general fitness estimates — not medical advice.

Can I switch between metric and imperial units?

Yes. Every tool supports both systems and remembers your preference in localStorage.

General fitness estimates — not medical advice. Consult a healthcare professional for medical decisions.