How far is a half marathon?

A half marathon is exactly 21.0975 km (13.1094 miles). Race courses are measured to this standard distance by World Athletics certification.

What is a good half marathon finish time?

The average recreational finisher completes a half marathon in about 2:10–2:20. Sub-2:00 is a common goal for regular runners; sub-1:45 is competitive at most local races; sub-1:30 is a strong club-level performance.

How do I use this calculator to set my GPS watch?

Enter your goal time, then note the "Pace per Mile" or "Pace per KM" value shown. Enter that pace as the target pace alert in your watch. The split table also lets you confirm expected times at each mile or km marker.

What is an even-split race strategy?

An even-split strategy means running each mile or kilometer in the same amount of time. This calculator assumes even splits, which is the most efficient approach for most runners. A negative-split strategy (slightly faster in the second half) is even better if you can execute it.

How do I calculate half marathon pace without a calculator?

Divide your total target time in seconds by 21.0975 to get seconds per km, or by 13.1094 to get seconds per mile. Convert back to minutes and seconds by dividing by 60 for the minutes and taking the remainder as seconds.

Half Marathon Pace Calculator

Name: Half Marathon Pace Calculator
Availability: InStock
Author: Nham Vu

Enter a target finish time to get the exact per-mile and per-km pace you need, plus a full split table for every mile and kilometer.

Goal Finish Time

Target Time (h : m : s)

Hours

Minutes

Seconds

Quick Presets

Show Splits In

Enter your goal time and click Calculate

Pace • Splits • Mile & KM markers

Required Pace

per mile

Required Pace

per kilometer

Finish Time

Speed

km/h

Speed

mph

Split Table

Marker	Split Time	Elapsed

Copied!

Summary

Enter a target finish time to get the exact per-mile and per-km pace you need, plus a full split table for every mile and kilometer.

How it works

Enter your target finish time in hours, minutes, and seconds.
Choose whether to view splits in miles or kilometers.
Click Calculate to see your required pace per mile and per kilometer.
Scroll the split table to review your expected time at every mile or kilometer marker.
Click any pace or time value to copy it to your clipboard.

Use cases

Plan your race-day pacing strategy before a half marathon.
Set per-mile or per-km targets to display on your GPS watch.
Check what finish time a given training pace projects to.
Review split times for every mile marker to pace negative splits.
Share your planned splits with a running coach or pacer.
Convert a goal time between min/km and min/mi without manual math.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu