Half Marathon Pace Calculator
Calculate the pace needed for a target half marathon finish time.
About Half Marathon Pace Calculator
Dividing the target time by the race distance gives the pace that must be held throughout. The halfway split is the checkpoint that reveals whether the pace is on track early enough to correct. The half marathon is the longest distance most runners can hold near threshold pace, which makes even pacing more forgiving than in a full marathon.
Formula
Half Marathon Pace
Pace = finish time ÷ the half marathon distance of 21.0975 km
- pace
- Time per kilometre needed to hit the target
- even splits
- Running the second half at the same pace as the first
Worked example
With the default values below, Half Marathon Pace Calculator returns Required Pace of 10.6648. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Target finish hoursaccepts 0–24 h
- 3 h
- Target finish minutesaccepts 0–59 min
- 45 min
- Target finish secondsaccepts 0–59 s
- 0 s
Results
- Required Pace
- 10.6648 min/km
- Required Pace
- 10:40 per km
- Required Speed
- 5.626 km/h
- Required Pace per Mile
- 17.1633 min/mile
- Halfway Split
- 1:52:30
Step by step
- 1Values used
- 2Half Marathon Pace
- 3Required Pace= 10.6648 min/km
- 4Required Pace= 10:40 per km
- 5Required Speed= 5.626 km/h
- 6Required Pace per Mile= 17.1633 min/mile
- 7Halfway Split= 1:52:30
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
- This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
Frequently Asked Questions
How is Half Marathon Pace calculated?
Pace = finish time ÷ the half marathon distance of 21.0975 km Dividing the target time by the race distance gives the pace that must be held throughout. The halfway split is the checkpoint that reveals whether the pace is on track early enough to correct.
Why does Half Marathon Pace matter?
The half marathon is the longest distance most runners can hold near threshold pace, which makes even pacing more forgiving than in a full marathon.
What values do I need to enter?
This calculator takes 3 inputs: Target finish hours, Target finish minutes, Target finish seconds. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.