Running Pace Calculator
Calculate running pace, finish time or distance — enter any two and get the third, with 5K, 10K, half and full marathon splits.
About the Running Pace Calculator
This running pace calculator solves the classic runner's triangle: pace, time and distance. Enter any two — say, a 10K distance and a 55-minute goal time — and it computes the third, in your choice of minutes per kilometre or minutes per mile. One-tap presets fill in exact race distances for the 5K, 10K, half marathon (21.0975 km) and marathon (42.195 km).
The maths is simple division — pace equals time divided by distance — but doing it in your head with hours, minutes and seconds mid-training is error-prone. The calculator also converts your pace to speed in km/h and mph, and projects a splits table showing what that pace delivers over 1 km, 1 mile and every major race distance, which is ideal for pacing strategy.
Use it to answer everyday training questions: what pace do I need for a sub-2-hour half marathon (5:41/km)? If I hold 6:00/km, when do I finish a 10K (1:00:00)? How far did I run in 45 minutes at 5:30/km (8.18 km)? Everything updates live as you type.
How to Use the Running Pace Calculator
- 1Choose what to calculate: pace, time or distance.
- 2Pick your unit — kilometres (min/km) or miles (min/mi).
- 3Enter the two known values; use the 5K/10K/half/marathon presets for exact race distances.
- 4Read the result, your speed, and the projected times for common race distances.
Frequently Asked Questions
How do I calculate my running pace?
Divide your total time by the distance covered. If you ran 5 km in 27:30, that is 1,650 seconds ÷ 5 = 330 seconds, or 5:30 per kilometre. This calculator does the seconds arithmetic for you and also converts between min/km and min/mi — a 5:00/km pace equals roughly 8:03 per mile.
What pace do I need to run a sub-2-hour half marathon?
A half marathon is 21.0975 km, so two hours requires 120 ÷ 21.0975 ≈ 5:41 per kilometre, or about 9:09 per mile. To bank a small buffer for aid stations and fatigue, many runners target 5:35–5:38/km. Enter the half-marathon preset and your goal time in this calculator to see any target pace exactly.
What is a good pace for a beginner runner?
Most new runners settle between 6:30 and 8:00 per kilometre (10:30–13:00 per mile) for easy continuous running, and that is exactly the right zone — easy pace should let you speak in full sentences. Speed comes later from consistency; a common first goal is a sub-30 5K, which needs 6:00/km.
How do I convert pace between min/km and min/mi?
One mile is 1.609344 km, so multiply a min/km pace by 1.609 to get min/mi (and divide to go back). A 5:00/km pace is 5 × 1.609 ≈ 8:03/mi; a 9:00/mi pace is about 5:36/km. Switching the unit selector in this calculator performs the conversion automatically on all results and splits.
Are the race splits realistic predictions of my finish times?
The splits table shows what a perfectly even pace produces over each distance — it is a pacing tool, not a fitness predictor. Nobody holds 5K pace for a marathon; endurance decays with distance (Riegel's rule suggests roughly 6% slower pace per doubling). Use splits to plan even pacing for a race you have already chosen a goal time for.