Free tools

Simple calculators, no account and no ads. They run entirely in your browser — nothing you type is sent anywhere.

• Running pace calculatorWork out pace per kilometre, speed and split times for the distance you pick.
• Calories burned calculatorEstimate the calories burned in a session, from weight, duration and type of effort.
• Race time predictorFrom one race time, estimate your times over 5 km, 10 km, half marathon and marathon.