Predict your race time from a recent run, or plan around a goal time. Get your pace per km and per mile, your halfway split and every split to the finish.
It uses the Riegel formula, a widely used model that scales a recent race time to a new distance. It assumes similar training and conditions, so predictions for much longer races, especially the marathon, tend to be optimistic without the endurance training to match.
Running the second half of a race faster than the first. This calculator sets a gentle negative split, starting about 1% slower than your average pace and finishing about 1% faster, which many runners find easier to hold than going out hard.
Use whatever your watch and the race markers show. UK races often mark miles, while most of the world uses kilometres. Switch between the two and the splits update instantly.
Choose "A goal time", enter your target and pick the race. You will get the pace per km and per mile, your halfway split and every split to the finish.
Yes. Use Print my splits to get a clean copy of your pace and splits for race day.
Training for a fitness race? Try the HYROX, DEKA FIT or Hybrid Games calculator.