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CalcWisee

One Rep Max Calculator

Estimate your 1RM for any lift using Epley, Brzycki, or Lander formulas.

Reviewed October 7, 2026 Runs in your browser — inputs are never stored

One Rep Max Calculator

1 Rep Max

116.7 kg

epley formula

Training loads from your 1RM
  • 100% · ~1 reps116.7 kg
  • 95% · ~2 reps110.8 kg
  • 90% · ~4 reps105.0 kg
  • 85% · ~6 reps99.2 kg
  • 80% · ~8 reps93.3 kg
  • 75% · ~10 reps87.5 kg
  • 70% · ~12 reps81.7 kg
  • 65% · ~15 reps75.8 kg
  • 60% · ~20 reps70.0 kg

Rep counts are typical for each percentage; individual results vary.

This tool provides general sports and fitness estimates for educational purposes only. It is not medical advice — consult a physician before starting or intensifying training, especially if you have a cardiovascular condition.

About the One Rep Max Calculator

The one rep max calculator estimates your 1RM with your choice of three formulas: Epley, Brzycki and Lander. They agree closely at low reps and diverge as reps increase, so sets of 2–10 reps give the most reliable estimates.

How to use it

  1. 1Enter the weight lifted.
  2. 2Enter the number of reps.
  3. 3Choose a formula and read the estimate.

Worked example

100 kg for 5 reps gives about 116.7 kg (Epley), 112.5 kg (Brzycki) and 113.7 kg (Lander).

Common use cases

  • Setting training percentages
  • Tracking progress
  • Comparing lifts

Frequently asked questions

A:Epley and Brzycki are most commonly used. All have similar accuracy for 3–10 reps.

Reviewed for accuracy · Last updated October 7, 2026

Formulas follow published sports-science literature and official league definitions (Karvonen heart rate reserve, Cooper and Bruce protocols, MET compendium values, and standard baseball, cricket, and basketball statistics).

CW

CalcWisee Editorial Team

Calculator development and formula review

CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.

Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards

References & sources

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