Kilometres to Metres Converter
This calculator converts between kilometres and metres instantly, using the exact SI definition that 1 kilometre equals 1,000 metres, so you get a precise result every time rather than an estimate. Type a value into either the kilometres field or the metres field and the other field updates immediately, which makes it useful for running and cycling distances, road and travel distances, physics and engineering calculations, and mapping, surveying or construction work where plans mix the two units. You can also pick a common distance from the preset dropdown, including 1 metre, 100 metres, 500 metres, 1 kilometre, a mile (1.609 km), 5 km, 10 km, a half marathon (21.0975 km), a full marathon (42.195 km) and 100 km, and the calculator fills in the kilometres field and converts automatically. Results are shown for kilometres, metres and centimetres in the results bar, with the full conversion, including millimetres, repeated in the detail boxes alongside a worked example and the formula used, kilometres multiplied by 1,000. Below the calculator you will find a reference table of common km to m conversions at a glance, plus notes on how the metric prefix system works. Because the conversion is defined exactly, with no rounding involved, you can rely on the figures for scientific work as well as everyday distance conversions.
Convert Kilometres to Metres
Convert Metres to Kilometres
Type in either field. Editing kilometres updates metres and vice versa.
Common km to m Reference
| Kilometres (km) | Metres (m) | Centimetres (cm) | Millimetres (mm) |
|---|---|---|---|
| 0.001 km | 1 m | 100 cm | 1,000 mm |
| 0.01 km | 10 m | 1,000 cm | 10,000 mm |
| 0.1 km | 100 m | 10,000 cm | 100,000 mm |
| 0.5 km | 500 m | 50,000 cm | 500,000 mm |
| 1 km | 1,000 m | 100,000 cm | 1,000,000 mm |
| 5 km | 5,000 m | 500,000 cm | 5,000,000 mm |
| 10 km | 10,000 m | 1,000,000 cm | 10,000,000 mm |
| 42.195 km | 42,195 m | 4,219,500 cm | 42,195,000 mm |
| 100 km | 100,000 m | 10,000,000 cm | 100,000,000 mm |