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Half Marathon Pace Calculator

Calculate half marathon pace from a target finish time, including mile and kilometer paces and even cumulative splits.

Published

Pace

Pace per mile
00:09:09
Pace per kilometer
00:05:41
Total time
02:00:00
Distance
13.1094 mi / 21.0975 km
Split times
1.0 miles
00:09:09
2.0 miles
00:18:18
3.0 miles
00:27:28
4.0 miles
00:36:37
5.0 miles
00:45:46
6.0 miles
00:54:55
7.0 miles
01:04:05
8.0 miles
01:13:14
9.0 miles
01:22:23
10.0 miles
01:31:32
11.0 miles
01:40:41
12.0 miles
01:49:51
13.0 miles
01:59:00
13.1 miles
02:00:00

Split times are rounded from the target time over the standard half marathon distance.

Split unit

Results update as you type.

Worked example

hours: 2 · minutes: 0 · seconds: 0 · distanceUnit: miles

Result: 00:09:09

Try it →

Half Marathon Pace Calculator

Calculate half marathon pace from a target finish time, including mile and kilometer paces and even cumulative splits.

Inputs and method

Enter finish time and choose split units. Pace and cumulative splits use the standard 21.0975 km half-marathon distance; calculations retain raw seconds and round split displays to the nearest second.

Interpreting the estimate

Use the result as a planning value and keep input precision consistent with the measurements or source data you have. Small displayed differences can come from final-place rounding; intermediate values are not rounded.

Assumptions and limits

Even pacing is an arithmetic plan, not a prediction or coaching prescription. Course measurement, terrain, weather, stops, and individual capacity affect actual splits.

Rejecting empty, invalid numeric, prohibited negative, zero-denominator, impossible, or unsupported inputs prevents the page from presenting a misleading numeric result. For related running tools, see the running pace calculator, the pace converter calculator, and the stride length calculator.

Method basis

Pace and cumulative splits are publisher derivations from the stated 21.0975 km distance and entered finish time. The route does not provide race-day guidance.

Compare Half Marathon Pace Calculator with related tools

All comparisons →
Half Marathon Pace vs Pace ConverterCompare planning a half marathon with race-specific even splits for the 21.0975 km distance versus converting a known pace between min/km, min/mile, km/h, and mph.Half Marathon Pace vs Running Pace CalculatorCompare race-specific half marathon pacing with even mile and kilometer splits against a general pace, time, and distance calculator.Half Marathon Pace vs Stride LengthCompare a race-pacing tool — even half-marathon splits from a target finish time over 21.0975 km — with a measured gait tool — step length from a measured distance and counted-step trials.Half Marathon Pace vs Swimming SpeedCompare two sport-specific pace calculators: even half-marathon splits from a target finish time versus swimming speed, pace per 100 meters, and projected times from a measured swim.Bicycle Power vs Half Marathon PaceCompare two endurance-effort measurements: cycling mechanical power computed from motion and resistance inputs versus half marathon pace from a target finish time, one in watts and the other in time per distance.Half Marathon Pace vs Vertical SpeedCompare two pace-planning calculators: even mile and kilometer splits for the standard 21.0975 km half marathon versus neutral ascent or descent rates from signed vertical distance and elapsed time.

Frequently asked questions

What distance does the half marathon pace calculator use?
It uses the standard half-marathon distance of 21.0975 km, which is 13.1094 miles. Pace and cumulative splits are computed from that fixed distance and the finish time you enter.
Why do split displays sometimes differ from hand-math?
Calculations retain raw seconds throughout and round only when a split is displayed, to the nearest second. Intermediate values are not rounded, so small final-place differences come from display rounding rather than a different method.
Does even pacing predict my actual race splits?
No. Even pacing is an arithmetic plan, not a prediction or coaching prescription. Course measurement, terrain, weather, stops, and individual capacity can all make actual splits differ from the calculated values.

Sources

  • half-marathon-distance-world-athletics

    primary · Aug 10, 2026

    Supports: Standard half-marathon distance of 21.0975 km (13.1094 mi) used for pace and cumulative-split calculations.

    — vWorld Athletics Half Marathon discipline page accessed 2026-08-10

  • half-marathon-mile-conversion-nist

    primary · Aug 10, 2026

    Supports: 1959 international definitions of the inch (25.4 mm) and yard (0.9144 m), the exact basis for the mile-to-kilometre conversion used in mile-denominated splits.

    — United States federal weights and measures, vFederal Register Notice 59-5442 (June 30, 1959)

Related calculators

Running Pace CalculatorCalculate running pace, elapsed time, or distance in miles or kilometers using exact unit conversion.Pace Converter CalculatorConvert pace and speed between min/km, min/mile, km/h, and mph using the exact international mile conversion.Swimming Speed CalculatorCalculate average swimming speed, pace per 100 meters, equivalent pool lengths, and constant-pace projected times.Stride Length CalculatorEstimate step or stride length from a measured distance and repeated counted-step trials, showing the observed range.Miles to Kilometers CalculatorConvert statute miles to kilometers using the exact international relationship 1 mi = 1.609344 km.Astronomical Unit CalculatorConvert astronomical units, kilometers, miles, meters, and light-years using the official AU value of 149,597,870,700 meters.

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