km to mm converter

1 kilometer equals 1,000,000 millimeters. Conversions use mm = km × 1000000

km → 1,000,000 mm

mm = km × 1000000

Converter

Worked examples

1 km = 1,000,000 mm
2 km = 2,000,000 mm
5 km = 5,000,000 mm
10 km = 10,000,000 mm
100 km = 100,000,000 mm

kilometers to millimeters conversion table

km	mm	Arithmetic
1 km	1,000,000 mm	× 1000000
2 km	2,000,000 mm	× 1000000
3 km	3,000,000 mm	× 1000000
4 km	4,000,000 mm	× 1000000
5 km	5,000,000 mm	× 1000000
6 km	6,000,000 mm	× 1000000
8 km	8,000,000 mm	× 1000000
10 km	10,000,000 mm	× 1000000
12 km	12,000,000 mm	× 1000000
15 km	15,000,000 mm	× 1000000
20 km	20,000,000 mm	× 1000000
25 km	25,000,000 mm	× 1000000
30 km	30,000,000 mm	× 1000000
40 km	40,000,000 mm	× 1000000
50 km	50,000,000 mm	× 1000000
60 km	60,000,000 mm	× 1000000
70 km	70,000,000 mm	× 1000000
80 km	80,000,000 mm	× 1000000
90 km	90,000,000 mm	× 1000000
100 km	100,000,000 mm	× 1000000

How to convert km to mm

Take your value in kilometers.
Multiply by 1000000
That is your answer in millimeters — no rounding needed until you choose a display precision.

Related conversions

mm to km mm to cm mm to m mm to in mm to ft mm to yd mm to mi mm to nmi cm to mm all length units

Questions

How many millimeters in 1 kilometer?

Exactly 1,000,000 mm. The factor follows from the definitions of both units, not from a measurement, so it is exact.

How do I convert km to mm?

Multiply the kilometers figure by 1000000 — or use the converter above, which updates as you type.

Is km to mm the same as mm to km?

No — they are inverses. One km is 1,000,000 mm, while one mm is 0.000001 km.

What is 1 km in mm?

1 km = 1,000,000 mm (see the value page for the full arithmetic).