Fitness & Health

Pace Calculator

Estimate pace, speed, and projected race time.

Inputs

Adjust the assumptions to match your scenario. Results update instantly.

DistanceCompleted distance in kilometers for the reference effort.Time minutesTotal time in minutes for the completed distance.Target distanceTarget race or workout distance used for the projected finish time.

Results

Primary outputs and comparison insights are built from the current inputs.

Pace per km

5.2

Average minutes needed to cover one kilometer.

Speed km/h

11.54

Average speed in kilometers per hour.

Projected time

109.72

Projected minutes needed to cover the target distance at the same pace.

How this calculator works

The Pace Calculator converts a completed run into average pace, speed, and a projected finish time for another distance at the same effort. Enter distance, time minutes, and target distance to estimate pace per km, speed km/h, and projected time. The calculator updates instantly and adds a comparison table plus chart so you can test the sensitivity of the result before you use it in a decision.

Quick guide

Jump straight to the section you need, then return to the calculator.

Inputs Outputs Assumptions Tips Formulas Examples Reference table Visual breakdown References

Inputs

Completed distance in kilometers for the reference effort.
Total time in minutes for the completed distance.
Target race or workout distance used for the projected finish time.

Outputs

Average minutes needed to cover one kilometer.
Average speed in kilometers per hour.
Projected minutes needed to cover the target distance at the same pace.

Assumptions

The pace is assumed to stay constant across the target distance.
Terrain, weather, and fatigue changes are not modeled.

Tips

Use this as a pacing baseline, then adjust for hills, heat, or race-day conditions.
Projection becomes less reliable as the target distance moves far away from the reference run.

Formula guide

Use these formulas to audit the output or explain it to someone else.

2 formulas

Pace per km = Total Time ÷ Distance

Projected Time = Pace per km × Target Distance

Usage examples

Review a ready-made scenario, copy it, then tweak inputs to match your case.

Example

3 inputs3 outputs

10K to half-marathon projection

Inputs

Example input Distance: 10
Example input Time minutes: 48
Example input Target distance: 21.1

Outputs

Example result Pace per km: 4.8
Example result Speed km/h: 12.5
Example result Projected time: 101.28

A pace projection is useful for setting expectations, but longer races often require a slower sustainable pace than shorter efforts.

Projected time by target distance

5 of 5 rows

Target distance	Pace per km	Projected time
16.1	5.2	83.72
19.1	5.2	99.32
21.1	5.2	109.72
26.1	5.2	135.72
31.1	5.2	161.72

Projection assumes the same pace throughout, which is useful for planning but not a guarantee for longer or hillier events.

Projected finish time

Highest: 31.1 (161.72)Lowest: 16.1 (83.72)

Sort

Target distanceProjected time

Focus point

16.1

83.72

Position

#1 of 5

Original order

Share of total

14.19%

Total: 590.2

PositiveNegative

Projection assumes the same pace throughout, which is useful for planning but not a guarantee for longer or hillier events.

References

Running pace and speed conversion basics
Endurance planning with pace-based projections

FAQ

Common questions

What does the Pace Calculator do?

What inputs do I need?

Typical inputs include Completed distance in kilometers for the reference effort., Total time in minutes for the completed distance., Target race or workout distance used for the projected finish time..

How are the results calculated?

We follow the formulas and assumptions outlined in the "How this calculator works" section. You will see outputs like Average minutes needed to cover one kilometer., Average speed in kilometers per hour., Projected minutes needed to cover the target distance at the same pace..