How to Use the Running Pace & Race Split Calculator
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1
Select a standard distance (5K, 10K, Half Marathon 13.1 mi, Marathon 26.2 mi) or enter a custom distance.
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2
Enter target finish time or desired pace (e.g. 5:00 min/km or 8:00 min/mile).
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3
View converted pace metrics and an interactive split table for every single kilometer or mile.
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4
Inspect halfway split times and finish velocity in km/h and mph.
Practical Example & Use Case
Common Real-World Scenario
Targeting a sub-4-hour marathon (3:59:59) requires maintaining a consistent pace of 9:09 min/mile (5:41 min/km).
Technical Notes & Limitations
Browser Engine Architecture
Calculates mathematical even splits without elevation course adjustments.
Frequently Asked Questions
How many kilometers is a Half Marathon?
A Half Marathon is exactly 21.0975 kilometers (13.1094 miles).