Half Marathon Pace Calculator

Pacing a half marathon

The half marathon (13.10938 miles / 21.0975 km) is long enough that pacing errors compound quickly. This calculator converts a goal finish time into a target pace and gives you 5K, 10K, and halfway checkpoints so you can gauge whether you're on track mid-race.

Fueling and hydration start to matter at this distance in a way they usually don't in a 5K or 10K. Practicing your race pace and fueling plan together in training reduces the odds of a late-race fade.

Where these numbers come from

The formulas and default values in this calculator are based on:

• Official half marathon race distance (13.10938 miles / 21.0975 km)

These are planning estimates for training purposes. Check with a coach, trainer, or physician before starting a new program or maxing out.