Planning a track session? Pick your rep distance, enter the target pace, set the number of reps and recovery type - the calculator builds a series-by-series plan with timed rest intervals based on the work-to-rest ratio for your chosen distance.
1200 m interval workout: splits and recovery
Planning a track session? Pick your rep distance, enter the target pace, set the number of reps and recovery type - the calculator builds a series-by-series plan with timed rest intervals based on the work-to-rest ratio for your chosen distance.
Set to 1200 m, the calculator applies a rule the neighbouring options do not. Rep distance decides how long each effort lasts, and that decides which energy system the session actually trains. This page opens the calculator with 1200 m already selected, so only the remaining fields are left to fill in. Swap in your own figures and the arithmetic is rebuilt from them.
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Five distances, three recovery types, one structured plan
This calculator takes four inputs - rep distance, target pace per kilometer, number of repetitions and recovery method - and returns a complete series-by-series interval workout. Rest periods follow the work-to-rest ratio principle: shorter reps get equal rest, longer reps get proportionally less. The result is a table showing each rep's time, the rest after it and a running cumulative clock.
How to use the interval training calculator - step by step
- Rep distance - select between 200 m and 2000 m. Short reps (200-400 m) target raw speed, long reps (1000-2000 m) target lactate threshold.
- Target pace - minutes and seconds - enter the per-kilometer pace you plan to hold during each fast rep. For example, 4 min 30 sec means a 4:30 min/km interval pace.
- Number of reps - set between 2 and 20. Beginners typically run 4-6 reps, advanced runners 8-12.
- Recovery type - choose jog (keeps heart rate elevated), walk (moderate recovery) or standing rest (full recovery).
- Read the results: total workout time, distance, rest duration per interval and a full series-by-series table.
Work-to-rest ratios by distance and recovery type
The calculator uses evidence-based ratios. Shorter reps need relatively more rest (equal time), while longer reps use shorter relative rest because the effort is submaximal.
| Rep distance | Jog recovery | Walk recovery | Standing rest |
|---|---|---|---|
| 200-400 m | 1:1 | 1:0.75 | 1:0.5 |
| 600-800 m | 1:0.75 | 1:0.67 | 1:0.5 |
| 1000-1200 m | 1:0.67 | 1:0.5 | 1:0.4 |
| 1600-2000 m | 1:0.5 | 1:0.5 | 1:0.4 |
Practical examples
When to use each rep distance
| Distance | Trains | Race goal | Typical effort |
|---|---|---|---|
| 200-400 m | Speed, neuromuscular power | 800 m - 1500 m | 90-95% |
| 600-800 m | VO2max, anaerobic capacity | 3 km - 5 km | 85-90% |
| 1000-1200 m | Lactate threshold | 5 km - 10 km | 80-85% |
| 1600-2000 m | Tempo endurance | 10 km - half marathon | 75-80% |
FAQ - Frequently asked questions
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See also
Calculator verified by the LiczGrupa.pl team
Content, formulas and results have been reviewed for accuracy and relevance by our team of specialists.
Reviewed by: Natalia Skrzek