How do I use the One Rep Max Calculator?

Enter your values in the fields provided and click Calculate. The calculator will instantly process your input and provide accurate results.

What formula does the One Rep Max Calculator use?

Uses the Epley or Brzycki formula to estimate the maximum weight liftable for a single repetition. The formula used is: Epley: 1RM = Weight × (1 + Reps / 30); Brzycki: 1RM = Weight × (36 / (37 - Reps)). This ensures accurate results based on established standards.

Is the One Rep Max Calculator free to use?

Yes, all Calzyra calculators are completely free to use. No registration or payment is required.

Are the results accurate?

Our calculators use mathematically verified formulas and are regularly tested for accuracy.

Can I use this on my phone?

Yes, all our calculators are fully responsive and work perfectly on smartphones, tablets, and desktops.

Sports CalculatorTraining & Performance

One Rep Max Calculator

Estimate your one-rep max (1RM) from submaximal lifts using proven formulas.

Updated 2025-01-152 min read

Calculator

Enter your values below

Weight Lifted*

Weight used for the set

Repetitions Performed*

Number of reps completed

Formula

Choose estimation formula

Formula

How it works

Epley: 1RM = Weight × (1 + Reps / 30); Brzycki: 1RM = Weight × (36 / (37 - Reps))

Uses the Epley or Brzycki formula to estimate the maximum weight liftable for a single repetition.

FAQ

Common questions