# Running Pace Calculator Example

Calculate running pace in Calcul.io from a timed distance, then reuse the pace to estimate how long another route will take.

## Running pace

Use a timed 12 km run to find a pace, then reuse it to estimate the time for another distance. Calcul.io keeps the units visible as each line updates.

```calculio
distance = 12 km
time = 30 min
pace = time / distance
weekendDistance = 8 km
weekendTime = weekendDistance * pace
```

## How it works

1. Replace `distance` and `time` with a measured effort.
2. Read `pace` as the time per kilometre.
3. Change `weekendDistance` to plan a second route.

Keep the units attached to both inputs so Calcul.io can convert and report a meaningful pace.

[Next: calculate circle measurements](https://calcul.io/examples/circle-measurements/index.md)