One Rep Max Calculator

Use the free online One Rep Max Calculator tool. Fast, private and easy to use — runs entirely in your browser. Part of our Sports Calculators collection.

One Rep Max Calculator

Estimate your one-rep max with the Epley formula plus common training percentages.

Running Calorie Calculator

Estimate calories burned running or walking a distance based on your body weight.

Race Time Predictor

Predict your finish time at a new distance from a recent result using the Riegel formula.

VO2 Max Calculator (Cooper Test)

Estimate aerobic fitness from a 12-minute run using the classic Cooper test formula.

Power-to-Weight Ratio Calculator

Compute watts per kilogram, the key performance metric in cycling and climbing.

Vertical Jump Power Calculator

Convert a vertical jump into peak leg power with the Sayers equation.

Ape Index Calculator

Find your ape index — wingspan minus height — the climber's favourite measurement.

Batting Strike Rate Calculator

Work out a cricket batting strike rate — runs per 100 balls faced.

Frequently Asked Questions

Is the One Rep Max Calculator free to use?
Yes. The One Rep Max Calculator is completely free with no sign-up, no limits and no watermarks. You can use it as many times as you like.
Is the One Rep Max Calculator safe and private?
Absolutely. The One Rep Max Calculator runs entirely in your browser, so your data never leaves your device and nothing is uploaded to a server.
Do I need to install anything to use the One Rep Max Calculator?
No installation is needed. The One Rep Max Calculator works instantly online in any modern browser on desktop, tablet or mobile.
Does the One Rep Max Calculator work on mobile phones?
Yes. The One Rep Max Calculator is fully responsive and works smoothly on iPhone, Android and any other device.