Question 1

What pace do I need for a 4:00:00 marathon?

Accepted Answer

A 4:00:00 marathon requires an average pace of 9:09/mi per mile (5:41/km per km).

Question 2

Should I run an even pace or a negative split?

Accepted Answer

Even pacing is the safest default and the easiest to execute without a watch. A negative split — running the second half faster than the first — is often the fastest net strategy on hilly or hot courses, but takes discipline to hold back early.

Question 3

How accurate is a pace calculator for race prediction?

Accepted Answer

A pace calculator is exact for converting a goal time into a target pace. Predicting a goal time from a different race distance is less reliable, and gets less accurate the larger the gap between the reference and target distance.

Question 4

What's the marathon world record?

Accepted Answer

As of July 2026, the men's marathon world record is 1:59:30, set by Sabastian Sawe (Kenya) at the London Marathon on Apr 26, 2026. The women's record is 2:09:56, set by Ruth Chepng'etich (Kenya) at the Chicago Marathon on Oct 13, 2024. Source: World Athletics.

Segment	Pace / mi	Split	Cumulative
First half	9:09/mi	2:00:00	2:00:00
Second half	9:09/mi	2:00:00	4:00:00
Total	9:09/mi	4:00:00

Marathon Pace Calculator

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