Pace Ladder
Solve pace, time or distance and plan even or negative splits per km or mile
Pace Ladder is a running calculator for training and race planning. Give it any two of distance, time and pace, and it works out the third, in kilometers or miles.
Pick what you want to find, then fill in the other two boxes. The answer appears in a large display at the top, together with the speed in km/h or mph; when you solve for pace, it also shows the same pace in the other unit. Times are typed as plain digits and the colons appear by themselves, so 14530 becomes 1:45:30 without looking for a colon key. Presets cover 1 mile, 5K, 10K, 15K, the half marathon (21.0975 km) and the marathon (42.195 km), and keep their exact length in either unit.
The split ladder turns a goal time into a plan. Each rung is one km or mile, with its split and the running total, and a bar that shows how much of the goal time has passed by then. A marathon ends with a short rung for the last 0.195 km. A slider moves up to 5% between the two halves for a negative or positive split, and the rounded splits still add up to the goal time to the second.
The race predictor takes one recent result and estimates 5K, 10K, half marathon and marathon times with Riegel's formula. The exponent is 1.06 by default and can be set anywhere from 1.01 to 1.15. Tap a prediction to open it in the solver.
The treadmill converter turns belt speed into pace and back, in km/h or mph, with a quick table of common belt settings and the finish times a speed would give over 5K, 10K, the half and the marathon.
Results worth keeping can be saved under a name, up to 20, with the date. Tap one to load it back into the solver.
Features:
- Solve pace, finish time or distance from the other two
- Kilometers or miles, with speed in km/h or mph
- Presets for 1 mile, 5K, 10K, 15K, half marathon and marathon
- Split ladder: one rung per km or mile with split and running total
- Even, negative or positive splits up to 5% that still sum to the goal
- Race predictor from 5K to marathon with an adjustable exponent
- Treadmill speed and pace converter with a quick table
- Up to 20 saved results, tap one to reload it
- Digit-only time entry, no colon key needed
Everything is worked out and stored on your phone. There are no accounts, no ads and no network access, and nothing you enter leaves the device.
Support
Questions or feedback: support@wobbly-emu.lol.