Calculate your pace, predict your finish time, or find your distance — for the half marathon and any race.
Tips:
This tool works three ways. Switch the mode to calculate the one you need:
The half marathon rewards even pacing. Going out too fast in the first few miles is the most common reason runners fade in the back half. Knowing your target pace — and practicing it in training — lets you bank energy early and finish strong. Pair this calculator with the race time predictor to turn a recent race result into a realistic half marathon goal.
Divide your total time by the distance you ran. For example, running 13.1 miles in 2 hours is a pace of about 9:09 per mile. This calculator does the math for you and also works in reverse — enter a goal pace to find your finish time, or a time to find how far you can go.
It depends on your experience. Many first-time finishers run 10:00–12:00 per mile (a finish time of roughly 2:11–2:37). A sub-2:00 half marathon requires holding about 9:09 per mile, and competitive recreational runners often target 7:00–8:00 per mile. Use your recent training paces as the most realistic guide.
One mile is 1.609 kilometers, so a per-mile pace is faster-sounding than the same effort per km. To convert min/mile to min/km, divide by 1.609; to go the other way, multiply by 1.609. This calculator supports both units so you do not have to convert manually.
Mostly no. Long runs are best run 60–90 seconds per mile slower than goal half marathon pace to build endurance without excessive fatigue. Save goal-pace running for tempo runs and race-specific workouts, with only segments of your long runs at race pace as the race approaches.