# Running calculators

> Markdown copy of https://pacewise.doughworks.dev/calculators, generated from the page. The page is canonical. Every page on this site has one; the index is https://pacewise.doughworks.dev/llms.txt.

Pace, race prediction, VDOT, age grading, treadmill conversion, pace charts and pace bands. Free, no sign-up.

- [**Pace calculator** Solve for pace, time or distance, and see every split.](https://pacewise.doughworks.dev/pace-calculator)
- [**Pace chart** Every pace from 3:00 to 8:00 /km and 5:00 to 13:00 /mile, as a table to read.](https://pacewise.doughworks.dev/pace-chart)
- [**Race time predictor** What your time is worth at every other distance. Three models, side by side.](https://pacewise.doughworks.dev/race-time-predictor)
- [**VDOT calculator** Your Daniels & Gilbert VDOT, and the race times it implies.](https://pacewise.doughworks.dev/vdot-calculator)
- [**Age grade calculator** Score a time against the world standard for your age and sex (WMA 2020).](https://pacewise.doughworks.dev/age-grade-calculator)
- [**Treadmill pace converter** Belt speed to outdoor pace, plus what an incline costs you.](https://pacewise.doughworks.dev/treadmill-pace-converter)
- [**Pace band generator** An even or negative-split plan to print and carry.](https://pacewise.doughworks.dev/pace-band)

## Why you can trust the numbers

Most running calculators never say which model they use, so when two disagree you can't tell which one is wrong. Every tool here names its model, shows the formula and cites the source.

Where a model has a known weakness the page says so next to the number, not in small print at the bottom. Riegel over-predicts a marathon off a 5K. Age-grade factors are a fitted standard, not a measurement.

The arithmetic is a port of the code the apps run, and a build check re-runs the apps' own test suite against the browser version. They can't drift apart without CI failing.

The app's own projection model, the one that blends every result you have logged rather than extrapolating from one, is specified in full on [the model page](https://pacewise.doughworks.dev/model): every formula, constant and source, written to be checked.