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# Convert a distance, or work out what fuel will cost

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## All calculators

- [Kilometers to miles](https://www.kilometer-mileage.com/km-to-miles.html): Convert any distance in km, plus a reference table of common values.

- [Miles to kilometers](https://www.kilometer-mileage.com/miles-to-km.html): The other direction, with the exact conversion factor explained.

- [Mileage calculator](https://www.kilometer-mileage.com/mileage-calculator.html): Distance driven and fuel used, in whatever units you have.

- [MPG and km/L converter](https://www.kilometer-mileage.com/fuel-economy-converter.html): Compare specs across US MPG, imperial MPG, km/L and L/100km.

- [Fuel cost and trip planner](https://www.kilometer-mileage.com/fuel-cost-calculator.html): How much fuel a journey needs and what it will cost.

- [Speed: km/h and mph](https://www.kilometer-mileage.com/kmh-to-mph.html): Convert a speed limit either way, with a chart of common limits.

- [Litres and gallons](https://www.kilometer-mileage.com/litres-to-gallons.html): Litres, US gallons and imperial gallons, all three at once.

## Common conversions

Common kilometer to mile conversions.

| Kilometers | Miles |
|---|---|
| 1 km | 0.62137 |
| 5 km | 3.10686 |
| 10 km | 6.21371 |
| 20 km | 12.42742 |
| 50 km | 31.06856 |
| 100 km | 62.13712 |

## The two numbers worth remembering

Every distance conversion on this site comes from one exact definition: the international mile has been fixed at 1,609.344 metres since 1959, which makes both directions simple multiplication.

```
miles = kilometers × 0.621371
kilometers = miles × 1.609344
```

For rough mental arithmetic, kilometers to miles is close to multiplying by 0.6, and miles to kilometers is close to adding half again. A 100 km drive is a bit over 60 miles; a 60 mile drive is a bit under 100 km.

## Watch out for the two gallons

A US gallon is 3.785 litres and an imperial gallon is 4.546 litres, so the same car looks about 20% more efficient when its economy is quoted in imperial MPG. If you are comparing a British review with an American one, check which gallon each is using before you conclude anything. The fuel economy converter shows both at once.

## Next steps

- [where every constant on this site comes from](https://www.kilometer-mileage.com/about.html)

- [how accurate these fuel estimates really are](https://www.kilometer-mileage.com/disclaimer.html)

## Common questions