Running tools
Quick calculators for pace, marathon splits and race predictions. Everything runs in your browser.
Pace calculatorPace or finish time for 5K, 10K, half marathon, marathon or any distance – with splits.
Marathon splitsA marathon split table for every kilometer, even pace or negative split, with a printable pace band.
Race predictorFrom one race result to 5K, 10K, half and marathon (Riegel + VDOT) plus training paces.
How it works
These tools turn a finish-time target into pace and checkpoints. Tables are mathematical planning references, not promises about fitness or personalised training advice.
Frequently asked questions
Do I need an account?
No. Public calculators and reference tables are free and require no login.
Are my calculations saved?
Calculations run in your browser. Entered results are not saved in the training database; the language preference may be stored locally in your browser.