Kalkulator 1RM

Use the free online Kalkulator 1RM tool. Fast, private and easy to use — runs entirely in your browser. Part of our Kalkulatory sportowe collection.

Weight lifted (kg) Reps performed

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

Kalkulator kalorii biegania

Distance (km) Body weight (kg)

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

Recent race distance (km) Recent race time (minutes) Target distance (km)

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

Distance in 12 minutes (m)

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

Power (watts) Body weight (kg)

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

Vertical jump (cm) Body weight (kg)

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

Wingspan (cm) Height (cm)

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

Runs scored Balls faced

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

Is the Kalkulator 1RM free to use?

Yes. The Kalkulator 1RM is completely free with no sign-up, no limits and no watermarks. You can use it as many times as you like.

Is the Kalkulator 1RM safe and private?

Absolutely. The Kalkulator 1RM 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 Kalkulator 1RM?

No installation is needed. The Kalkulator 1RM works instantly online in any modern browser on desktop, tablet or mobile.

Does the Kalkulator 1RM work on mobile phones?

Yes. The Kalkulator 1RM is fully responsive and works smoothly on iPhone, Android and any other device.