Kilometers to meters (km to m)

One kilometer is exactly 1,000 meters. That is the meaning of the metric prefixes, not a measurement: milli is a thousandth, centi a hundredth and kilo a thousand, so every conversion inside the metric system is a power of ten and nothing has to be looked up.

Worked through: 10 km x 1,000 = 10,000 m.

Going the other way, one meter is 0.001 kilometers.

To convert without a calculator, multiply by 1,000. Rounding that to 1,000 is within 0% for most purposes.

A decimal shift, searched mostly in a running context: race distances are quoted in kilometers and split times in meters. A 5K is 5,000 m and a marathon is 42,195 m, which is where the odd 42.195 comes from.

Precision is worth matching to the input. A measurement given as 1 km carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.