Any two of pace, time and distance give you the third. Splits come with it, every mile or every kilometer, ready to print before a race.
e.g. 3:30:00 or 25:00
Nothing’s estimated here: any two values give you the third. The mile and race distances are the official values, unrounded.
time = distance × pace
Speed is pace flipped over: a 7:30 mile is 8 mph, because 60 ÷ 7.5 = 8. Each row of the splits table is the time your watch should show at that marker if you run even. Print it, or copy the link to keep your numbers.
1 mile = 1.609344 km
Exact since 1959. To switch units without solving anything, use the pace converter.
13.109 mi · 26.219 mi
21.0975 km and 42.195 km, the official road distances every certified course is measured to.
5K in 25:00: 8:03 per mile. 10K in 50:00: same pace. Half marathon in 1:45: 8:01 per mile. Marathon in 4:00: 9:09 per mile. To see what your 10K says about your marathon, try the race time predictor.
8:01 per mile (4:59 per km), all the way through 26.2. A 4-hour marathon takes 9:09 per mile, and sub-3 takes 6:52. On the Pace tab, tap Marathon and type your goal time to get every mile split.
9:09 per mile (5:41 per km), about 6.55 mph. Weaving around people and running wide on corners adds distance, so aim a few seconds per mile faster.
Divide 60 by your speed in mph: 6 mph is a 10:00 mile, 7.5 mph is 8:00, 8 mph is 7:30. Here, switch to the Time or Distance tab and type the speed in the speed box. Add 1% incline to match outdoor effort.
Course measurers use the shortest line through every corner, and you won’t run that line to the foot. GPS also wobbles between tall buildings. Finishing on 26.4 to 26.6 is normal, so if you pace off your watch, run a few seconds per mile faster than the number here.
The splits assume even pacing, the cheapest way to cover a flat course. Plenty of runners start the first mile or two a little slower, settle into goal pace and finish a touch faster. Going out too fast is still the classic way to hit the wall at mile 20.