Run smarter. Never miss a ballot.

Free running calculators for pace, race predictions and splits — plus race dates and ballot windows for all eight World Marathon Majors, in one place.

Calculators

/km

Running Pace Calculator

Pace, time or distance — enter two, get the third. Km and miles.

 42k

Race Time Predictor

Predict your 5K, 10K, half and marathon times from one recent race.

 splits

Marathon Split Calculator

Even or negative splits for any goal time, per km or per mile.

Marathon majors Full guide →