Kiiro
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Free running tools

Calculators for runners, with no sign-up. Where Kiiro makes the same calculation, as with heart rate zones and load balance, the numbers match what you see in the app.

The pace of a race, the finish times a pace leads to, or how far a pace takes you, with a split for every kilometer or mile.

Also known as a Riegel calculator

Enter one recent race and get the times it points to at 5K, 10K, half marathon and marathon.

A weekly mileage calculator, also known as an ACWR calculator

Enter your last few weeks and see which distance next week keeps your training in balance, next to what the 10% rule would allow.

Treadmill speed in km/h or mph to pace per kilometer and per mile, and back, with a pace chart.

Also known as the 12-minute run test

An estimate of your VO2 max from the distance you cover in 12 minutes.

Enter your maximum heart rate, or your age, and get your five training zones in beats per minute.

Also known as the Karvonen formula

Zones from your maximum and your resting heart rate.

Also known as LTHR zones

Zones anchored to the hardest effort you can hold for about an hour, with a simple test to find it.

Free on the App Store. Syncs with Apple Health in seconds.

Download Kiiro on the App Store