Sports

Half Marathon Pace Calculator

Find the pace needed for a target half-marathon time.

Target hours

Target minutes

Calculated Output

Pace per km (s/km) 298.61

Pace per mile (s/mi) 480.57

Formula: pace = total time ÷ 21.0975 km

Step-by-Step Breakdown

1. Values used:

2. Target hours = 1

3. Target minutes = 45

5. Pace per km = 298.61s/km

6. Pace per mile = 480.57s/mi

Did this calculator solve your problem today?

The math behind it

pace = total time ÷ 21.0975 km (or ÷ 13.11 miles).

A 1:45 half → about 4:59 per km (8:01 per mile).

Should I go out at this pace?

Yes — even pacing usually beats starting too fast and fading.