Convert KM To MM

Please enter a value below to convert kilometers to millimeters:

In order to do a reverse conversion from millimeters to kilometers clear values in the above fields and input the value in the “Millimeters” field or go to millimeters to kilometers converter page.

Facts about Kilometer

Basic facts: A kilometer is a unit of length in the metric system, its symbol is “km”, it is equivalent to one thousand meters and 0.6214 miles. [kilo-is the SI prefix for 1000]. A slang term for the kilometer in the US, Canadian, and UK, militaries is “klick”.

History: The origin of the kilometer is related to that of the meter, and its present definition is the distance traveled by light in 1/299 792 458 seconds. The relationship between the meter and the kilometer will remain constant, although the above-mentioned definition is subject to change.

Use: Currently, it is the official unit of measurement for expressing distances between the world’s most geographical places on land. Though, there still remain some countries that mainly use the mile instead of the kilometer including the United Kingdom (UK) and the United States (US). The UK has adopted the metric system, unlike the United States, while in the UK, the metric system is widely used in government, industry, and commerce, rest of the imperial system can still be seen in the United Kingdom’s use of miles in its road systems.

Facts about Millimeter

Basic facts: A millimeter [American spelling] or millimetre [international spelling – symbol: mm] is a unit of length in the SI (International System of Units). The millimeter is equivalent to one-thousandth of a meter and it is defined as the distance traveled by light in 1/299 792 458 000 of a second.

History: The prefix “milli” is one of many metric prefixes. It shows the base unit’s one-thousandth, in this instance, the meter. The current definition is based on the distance traveled by the speed of light in a given amount of time, however, the definition of the meter has changed over time. The relationship between the meter and the millimeter is continuous. Before this definition, the meter was based on the length of a prototype meter bar. The meter has been re-defined based on the changes made to the definition of a second, in 2019.

Use: The millimeters are used to exactly measure the length of small or narrow objects. On a metric ruler or stick, it is the smallest unit of length.

How many millimeters in a km? 

1 km is equivalent to 1000000 millimeters. Use 1000000 as the factor to convert kilometers to millimeters. Below find some popular kilometers to millimeters conversion questions:

• How many millimeters in 2 kilometers?  2 kilometers x 1000000 = 2000000 number millimeters
• How many millimeters in 3 kilometers?  3 kilometers x 1000000 = 3000000 number millimeters
• How many millimeters in 5 kilometers?  5 kilometers x 1000000 = 5000000 number millimeters
• How many millimeters in 10 kilometers? 10 kilometers x 1000000 = 10000000 number millimeters
• How many millimeters in 20 kilometers? 20 kilometers x 1000000 = 20000000 number millimeters
• How many millimeters in 50 kilometers? 50 kilometers x 1000000 = 50000000 number millimeters
• How many millimeters in 100 kilometers? 100 kilometers x 1000000 = 100000000 number millimeters
• How many millimeters in 1000 kilometers? 1000 kilometers x 1000000 = 1000000000 number millimeters

kilometers to millimeters conversion chart

Kilometers	Millimeters	Kilometers	Millimeters	Kilometers	Millimeters	Kilometers	Millimeters
1	1000000	26	26000000	51	51000000	76	76000000
2	2000000	27	27000000	52	52000000	77	77000000
3	3000000	28	28000000	53	53000000	78	78000000
4	4000000	29	29000000	54	54000000	79	79000000
5	5000000	30	30000000	55	55000000	80	80000000
6	6000000	31	31000000	56	56000000	81	81000000
7	7000000	32	32000000	57	57000000	82	82000000
8	8000000	33	33000000	58	58000000	83	83000000
9	9000000	34	34000000	59	59000000	84	84000000
10	10000000	35	35000000	60	60000000	85	85000000
11	11000000	36	36000000	61	61000000	86	86000000
12	12000000	37	37000000	62	62000000	87	87000000
13	13000000	38	38000000	63	63000000	88	88000000
14	14000000	39	39000000	64	64000000	89	89000000
15	15000000	40	40000000	65	65000000	90	90000000
16	16000000	41	41000000	66	66000000	91	91000000
17	17000000	42	42000000	67	67000000	92	92000000
18	18000000	43	43000000	68	68000000	93	93000000
19	19000000	44	44000000	69	69000000	94	94000000
20	20000000	45	45000000	70	70000000	95	95000000
21	21000000	46	46000000	71	71000000	96	96000000
22	22000000	47	47000000	72	72000000	97	97000000
23	23000000	48	48000000	73	73000000	98	98000000
24	24000000	49	49000000	74	74000000	99	99000000
25	25000000	50	50000000	75	75000000	100	100000000

Convert kilometers to other volume units

• Convert KM to CM
• Convert KM to Inches
• Convert KM to Feet