Run/walk finish-time calculator

Why the final interval matters

Run for 4:00 at 8:00/km, then walk for 1:00 at 12:00/km. Each full cycle covers 0.5 km running plus 1/12 km walking, or 7/12 km in five minutes. Repeating that pattern indefinitely averages about 8:34.3/km.

Over exactly 1 km, you finish during the second running interval: run 4:00, walk 1:00, then run another 3:20. Finish time is 8:20, with 7:20 running and 1:00 walking. Applying the repeated-cycle average to the whole kilometer would miss the fact that you finish before the next walk.

The calculation

Convert both paces to seconds per meter. Cycle distance = run interval ÷ running pace + walk interval ÷ walking pace. Calculate the number of complete cycles, then cover any remaining distance by running first and walking only if necessary. Add your separately entered stationary stops after calculating moving time. Paces must be combined through distances and speeds, not an arithmetic average of minutes per mile.

Walk breaks begun includes a final partial walk when there is one. At a complete cycle boundary, the final partial cycle is zero. A 0:00 walk interval gives continuous running; the walking pace is then ignored. This page calculates finish time from chosen paces; it does not solve backward for the pace needed to hit a goal.

Units and practical limits

Running and walking pace share one selected unit; distance has its own unit. Unit changes convert existing values. The NIST conversion is 1 mile = 1,609.344 meters. Times use m:ss or h:mm:ss. The maximum distance is 1,000 selected units and the maximum finish time is seven days. Results round to tenths; exported calculation rows retain unrounded values.

Assumes fixed speeds and a run-first timed pattern. Extra stops do not advance the run/walk cycle clock. It does not select suitable intervals or account for terrain, weather or fatigue. For continuous race checkpoints, try the race split calculator; for work/recovery sessions, use the track interval calculator.