By Zencalcy Editorial TeamLast reviewed About us
Work out the steady pace a marathon goal time demands. A marathon is 42.195 km, or 26.2 miles, so the finish time divided by that distance gives the average pace you must hold from the gun to the line.
Find the average pace for your marathon goal time.
pace (per km) = goal time ÷ 42.195 pace (per mile) = pace (per km) × 1.609344 split = pace × split distance
This is an even pace, which is a useful benchmark but not a target for everyone. Many runners run the first half slightly slower and aim for a negative split, especially on a hilly course.
| Symbol | Meaning |
|---|---|
| goal time | Your target marathon finish time in hours and minutes. |
| pace | Average time per kilometre or per mile at that finish time. |
| split | The time you would reach a shorter distance at the same pace. |
A 3:30 marathon needs an average pace of about 4:59 per km, which is about 8:01 per mile. At that pace you would pass 5K in 24:53, 10K in 49:46, and the half marathon in 1:45:00.
Marathon pace is the average speed that carries you over 42.195 kilometres, or 26.2 miles, in your target finish time. The calculator divides your goal time by that fixed distance to give minutes per kilometre and per mile, which is the steady rhythm you would hold if the effort were perfectly even.
A common way to find a realistic target is to take a recent shorter race and scale it up, but the marathon rewards endurance far more than shorter races do, so a straight proportional projection is usually too optimistic. Most runners choose a pace their long runs have shown they can sustain rather than one extrapolated from a fast ten kilometre.
The headline pace assumes you run even splits, but most people slow in the closing stages because of fatigue, heat, or starting too fast. A negative split, where the second half is slightly quicker, generally marks a well judged race, while a large positive split usually traces back to an opening that felt momentarily easy.
Terrain and weather move the real pace away from the average too. A hilly course gives back on the descents only part of what the climbs cost, and a warm day slows almost everyone, so the number is a target line to run toward rather than a promise of the exact minute.
Continue with the Race Time Prediction Calculator, Running Cadence Calculator, or the Running Pace Calculator — or browse more running tools and all sports calculators.
An even pace is the simplest plan and is often close to the most efficient. If the course has hills or you prefer to start slower, adjust the aim but keep the same average.
Every result is computed locally in your browser from the formulas shown above. Nothing you type is uploaded, logged, or stored, and no account is required.
Reference material used to build and check this calculator:
Last reviewed: September 2026. See how we build and check every tool on the about page.
Free calculator · No signup
Free calculator · No signup
Free calculator · No signup
Free calculator · No signup
Free calculator · No signup
Free calculator · No signup
Content updated: September 2026