Tool4SaaS

One-Rep Max Calculator

Estimate your one-rep max strength from weight lifted and reps using Epley and Brzycki formulas. Get training-zone weights instantly, private offline.

Epley estimated 1RM

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Epley: w × (1 + r / 30)
Brzycki estimated 1RM

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Brzycki: w × 36 / (37 − r)

90% of 1RM (avg)

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85% of 1RM (avg)

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80% of 1RM (avg)

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75% of 1RM (avg)

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Training zones are based on the average of Epley and Brzycki estimates. Enter 1–36 reps; estimates are most accurate for low rep ranges.

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About the author

Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .

Frequently asked questions

Epley: w×(1+r÷30); Brzycki: w×36÷(37−r); shown side by side.

No, for informational purposes only. Consult a healthcare professional for personal guidance.

Yes, it is free, works offline in your browser, and your data never leaves your device.

How to use One-Rep Max Calculator

  1. Enter lift: Type weight and reps performed.
  2. View max: See Epley and Brzycki estimates.
  3. Train: Use zone table for sets.