Free tools

Run the numbers.

Calculators we use ourselves when planning a block or a race. Free, no sign-up, and nothing you type leaves your browser.

Distance and time in, pace and every split out. Kilometres or miles.

Turn one recent race into a fair guess at the other three.

Five training zones from your age, max or resting heart rate.

Easy, tempo, interval and rep paces worked out from one recent race.

How many gels, when to take them, and roughly how much to drink.

Turn the km/h or mph on the console into pace per km and per mile.

Log the miles on each pair and see when the foam is due for retirement.