Length Converter.

Convert between millimetres, centimetres, metres, kilometres, inches, feet, yards and miles.

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Reference Table

mm	cm	m	km	in	ft	yd	mi	nmi
0.1	0.01	0.0001	1.000000e-7	0.0039370079	0.000328084	0.0001093613	6.213712e-8	5.399568e-8
1	0.1	0.001	0.000001	0.0393700787	0.0032808399	0.0010936133	6.213712e-7	5.399568e-7
10	1	0.01	0.00001	0.3937007874	0.032808399	0.010936133	0.0000062137	0.0000053996
100	10	0.1	0.0001	3.937008	0.3280839895	0.1093613298	0.0000621371	0.0000539957
1000	100	1	0.001	39.370079	3.28084	1.093613	0.0006213712	0.0005399568
10000	1000	10	0.01	393.700787	32.808399	10.936133	0.0062137119	0.005399568
100000	10000	100	0.1	3937.0079	328.08399	109.36133	0.0621371192	0.0539956803

Units in this converter

mmMillimetre

cmCentimetre

1 mm = 0.1cm

mMetre

1 mm = 0.001m

kmKilometre

1 mm = 0.000001km

inInch

1 mm = 0.03937008in

ftFoot

1 mm = 0.00328084ft

ydYard

1 mm = 0.00109361yd

miMile

1 mm = 6.2137e-7mi

nmiNautical Mile

1 mm = 5.3996e-7nmi

Understanding length conversion

A length converter changes a distance from one unit into another — centimetres to inches, or kilometres to miles. It is handy whenever a measurement is given in a system you don't use day to day: reading an imperial tape measure in a metric country, sizing furniture from an overseas store, or comparing race distances. This tool covers metric units (mm, cm, m, km), imperial units (inch, foot, yard, mile) and the nautical mile.

The formula. Every value is converted through one base unit, the metre. Each unit has an exact factor: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 yard = 0.9144 m, 1 mile = 1,609.344 m and 1 nautical mile = 1,852 m. A value is multiplied to metres, then divided by the target unit's factor: result = value × factor(from) ÷ factor(to).

Worked example. Say a room is 4.5 metres wide and you want the width in feet. Since 1 foot = 0.3048 m, divide: 4.5 ÷ 0.3048 ≈ 14.76 feet, or about 14 feet 9 inches. Going the other way, a 6-foot shelf is 6 × 0.3048 = 1.83 metres.

Where it's used. Length conversion comes up everywhere: a 5 km run is about 3.11 miles, a 55-inch TV is roughly 140 cm across, and an aircraft cruising at 35,000 feet is near 10,668 metres. Construction drawings, tailoring, shipping dimensions and international online shopping all mix metric and imperial units, so quick conversion avoids costly errors.

How to convert length units

Choose the unit you are converting from. This converter covers 9 units: mm, cm, m, km and 5 more.
Choose the unit you want in the second dropdown, or press the swap button to reverse the direction.
Type your value. The result updates as you type; there is no calculate button.
Use Copy to take the number, or Share to send a link with your value already filled in.

Frequently Asked Questions

How many centimetres are in an inch?

One inch equals exactly 2.54 centimetres — this is the internationally agreed definition, not a rounded approximation. So 12 inches (one foot) is 30.48 cm, and 1 cm is about 0.3937 inches.

What is the difference between a mile and a nautical mile?

A statute mile is 1,609.344 metres and is used for distances on land. A nautical mile is 1,852 metres — a little longer — and is used in aviation and at sea because it equals one minute of latitude along a meridian.

How do I convert metres to feet?

Multiply metres by 3.28084, because 1 foot is 0.3048 m exactly. For example, 1.8 m × 3.28084 ≈ 5.91 ft, which is about 5 feet 11 inches. To convert feet back to metres, divide by 3.28084.

Are inches and feet the same in the US, UK and India?

Yes. The 1959 international yard and pound agreement fixed 1 inch = 2.54 cm exactly, so the inch, foot, yard and mile are identical across the US, UK, India and other English-speaking countries. Only the rarely used "US survey foot" differs, by a few parts per million in specialised land surveying.