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Running Pace Calculator

Calculate pace (min/km or min/mile), finish time, or distance for 5K, 10K, half marathon, marathon, or any custom run.

Enter any two of distance, time, and pace to calculate the third.

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How to use a pace calculator

A pace calculator solves the relationship between three variables: distance, time, and pace. If you know any two, the third is determined. This calculator handles all three directions.

Find Pace is the most common use. Enter your race distance and finish time, and the calculator tells you the pace you ran (or need to run). This is what you use when planning a race: "I want to run a half marathon in 1:45. What pace is that?"

Find Time works the other way. You know your target pace and the distance, and the calculator tells you your finish time. Useful for goal-setting: "If I run 10K at 5'30"/km, when do I finish?"

Find Distance is for time-based runs. You have 45 minutes and plan to run at 6'00"/km. How far will you go? This is what coaches use when prescribing "run for 40 minutes at easy pace" and the runner wants to plan a route.

When even splits don't work

This calculator gives you even-split targets, the same pace every kilometer. Real races are messier. Three things break even pacing:

  • Terrain. Hills force pace variation. A 5'00"/km average on a hilly course might mean 4'40" on the downhills and 5'30" on the climbs. The calculator assumes flat.
  • Fatigue. In races longer than 10K, most runners slow in the final third. A marathon goal pace of 5'00"/km often means running 4'55" early and 5'10" late. Planning for this is smarter than pretending it won't happen.
  • Crowding. The first kilometer of a big race is always slower than planned. Build that into your mental model. Don't chase the lost seconds.

How Pace It handles pacing

This calculator gives you a static number from a single input. Pace It derives your training paces from your actual running data: recent workouts, heart rate trends, and performance history. Your paces update automatically as your fitness changes, so you always train at the right intensity.

Related Tools

VDOT Calculator

Get your VDOT fitness score, equivalent race times, and training paces from a single race result.

Pace & Speed Converter

Convert between min/km, min/mile, km/h, and mph instantly.

Questions

Running Pace Calculator FAQ

Divide your total time by the distance you ran. For example, if you ran 10km in 50 minutes, your pace is 50 / 10 = 5'00" per kilometer.

To convert to miles, multiply the per-km pace by 1.609, so 5'00"/km is approximately 8'03"/mile. This calculator does the conversion automatically and works in both directions.

A sub-4-hour marathon requires a pace of 5'41"/km (9'09"/mile) over 42.195km. That means crossing each 5km mark in roughly 28:25.

In practice, most runners need to train at a slightly faster pace to account for slowing in the final 10km. A good target of 5'35"/km for the first 32km builds a small buffer for the inevitable late-race fade.

A comfortable beginner pace is typically 6'30" to 8'00" per kilometer (10'30" to 12'50" per mile). The right pace is one where you can hold a conversation without gasping.

Most beginners run too fast. If you can't speak in full sentences, slow down. Speed comes from consistency over months, not from pushing every run. A typical beginner 5K time is 30 to 40 minutes.

Multiply your min/km pace by 1.609 to get min/mile. For example, 5'00"/km is 5 × 1.609 = 8'03"/mile. To go the other way, divide min/mile by 1.609.

The conversion factor is the number of kilometers in a mile (1.60934). This calculator handles the conversion automatically when you toggle between km and miles.

A pace calculator gives you an even-split target, the same pace every kilometer. Real races are rarely that even. Hills, wind, crowding, and fatigue all affect actual splits.

Use the calculated pace as a planning tool, not a rigid target. Most experienced runners aim to run the first half slightly slower than goal pace and the second half at or slightly faster.

At 5'00"/km you cover 6.0km in 30 minutes. At 6'00"/km you cover 5.0km. At 7'00"/km you cover 4.29km.

Use this calculator's "find distance" mode to calculate the exact distance for any pace and time combination. This is useful for planning time-based runs. For example, if you have 45 minutes before work and want to know how far you can go at your easy pace.

Running Pace Calculator - Time, Distance, Pace | Pace It