One-Rep Max Calculator

Estimate your one-rep max from the weight and reps of a set, using two common formulas.

Weight lifted

Reps

Estimated 1RM (Epley)

—

Brzycki—

For 5 reps (~87%)—

✉ Email me this result

</> Embed this calculator

Paste this into any website or blog post. It is free — the small "powered by" link must stay visible.

<iframe src="https://calculatorspoint.net/embed/one-rep-max-calculator/" style="width:100%;max-width:640px;height:560px;border:1px solid #e3e8ef;border-radius:12px;" loading="lazy" title="One-Rep Max Calculator"></iframe>

How it works

Epley: w × (1 + reps/30); Brzycki: w × 36 ÷ (37 − reps)

Frequently Asked Questions

How does the One-Rep Max Calculator work?

Estimate your one-rep max from the weight and reps of a set, using two common formulas.

Is this medical advice?

No. It gives general estimates only. For decisions about your health, speak with a qualified professional.