Try Calculators

Strength Calculator

Free strength calculator to estimate 1rm. Instant results in your browser — no signup.

Also known as: Estimate 1RM, one rep max calculator, Estimate one-rep max, Calculate strength level relative to body weight, estimate 1rm calculator, estimate 1rm, strength sports, fitness & gaming, strength estimate 1rm

Direct calculator

Inputs

Results update when you click Calculate.

Estimated 1RM

93.3

(weight) * (1 + (reps)/30)

Ad · below results slot

Recently used

Tools you open will show up here on this device — with your last inputs when available.

What this result means

Free strength calculator to estimate 1rm. Instant results in your browser — no signup. Estimate 1RM: (weight) * (1 + (reps)/30).

Assumptions

  • Rule dependency: Game/sport rules may vary.

How it works

Estimate 1RM: (weight) * (1 + (reps)/30).

Example

Example: “one rep max calculator”. Enter your values and click the button to get a result.

Frequently asked questions

What does this 1rm calculator do?+

It helps you estimate 1rm. Typical search: “one rep max calculator”.

How should I read the result?+

Estimate 1RM using weight; reps; formula. Result: estimated 1RM.