A worked example
A 21.0975 km half-marathon in 1:45:00 averages about 4:59/km. A 1 km card has 22 rows; the last is 0.0975 km.
Race splits
Create an even-pace split card for a target finish time, including the final partial kilometre or mile.
YOUR LITTLE WORKBENCH
Race splits
Start with the example, then make it your own. Results update as you type.
How this is calculated
Cumulative time at distance x = target time × x ÷ full distance. Partial final splits use the same pace.
YOUR PLAN / LIVE RESULT
Average pace
4:59 /km- Pace per mile
- 8:01 /mi
- Average speed
- 12.0557 km/h
- Average speed
- 7.4911 mph
- Elapsed time
- 1:45:00
- Distance
- 21.0975 km
Times are calculated at full precision, then rounded for display; adjacent rounded split values may differ by one second. This is an even-pace plan and does not model elevation, stops or negative splits. Maximum 1,000 segments.
Your detailed plan
22 rows · all included in CSV| Split | Segment (km) | Cumulative (km) | Segment time | Elapsed time |
|---|---|---|---|---|
| 1 | 1 | 1 | 4:59 | 4:59 |
| 2 | 1 | 2 | 4:58 | 9:57 |
| 3 | 1 | 3 | 4:59 | 14:56 |
| 4 | 1 | 4 | 4:58 | 19:54 |
| 5 | 1 | 5 | 4:59 | 24:53 |
| 6 | 1 | 6 | 4:59 | 29:52 |
| 7 | 1 | 7 | 4:58 | 34:50 |
| 8 | 1 | 8 | 4:59 | 39:49 |
| 9 | 1 | 9 | 4:59 | 44:48 |
| 10 | 1 | 10 | 4:58 | 49:46 |
| 11 | 1 | 11 | 4:59 | 54:45 |
| 12 | 1 | 12 | 4:58 | 59:43 |
| 13 | 1 | 13 | 4:59 | 1:04:42 |
| 14 | 1 | 14 | 4:59 | 1:09:41 |
| 15 | 1 | 15 | 4:58 | 1:14:39 |
| 16 | 1 | 16 | 4:59 | 1:19:38 |
| 17 | 1 | 17 | 4:58 | 1:24:36 |
| 18 | 1 | 18 | 4:59 | 1:29:35 |
| 19 | 1 | 19 | 4:59 | 1:34:34 |
| 20 | 1 | 20 | 4:58 | 1:39:32 |
| 21 | 1 | 21 | 4:59 | 1:44:31 |
| 22 | 0.0975 | 21.0975 | 0:29 | 1:45:00 |
THE METHOD / 01
Know what goesinto your result.
Cumulative time at distance x = target time × x ÷ full distance. Partial final splits use the same pace.
Keep the assumptions clear
Times are calculated at full precision, then rounded for display; adjacent rounded split values may differ by one second. This is an even-pace plan and does not model elevation, stops or negative splits. Maximum 1,000 segments.
A FEW USEFUL ANSWERS
Good to know.
Are my inputs uploaded?
No. Calculations run locally in your browser. The host still receives normal requests for website pages and assets.
Can I keep my result?
Export a CSV, or use Print / PDF and choose Save as PDF in your browser. Inputs are not saved between visits.
Do I need an account?
No sign-up, paid API or subscription is required. Both language versions use the same calculation logic.
STRIDEKIND / TOOLKIT
A little help for every step.
01
Pace calculator
Enter distance and elapsed time to calculate pace per kilometre, pace per mile and average speed.
Open tool02
Finish time
Estimate elapsed time from a constant pace and distance. Includes 5K, 10K, half-marathon and marathon presets.
Open tool04
Speed converter
Convert km/h or mph to running pace and calculate a constant-speed 400-metre lap time.
Open tool