Which units does this length converter support?

Nine units: millimetres, centimetres, metres, kilometres, inches, feet, yards, statute miles and nautical miles. Type a value into either the From or the To box and the other one recalculates as you type — the converter tracks which field you last edited and converts in that direction, so you can work entirely in whichever unit you already have.

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

A statute mile is exactly 1609.344 m and is used for land distances. A nautical mile is exactly 1852 m — about 15% longer — and is used at sea and in aviation. Because a nautical mile was defined as one minute of latitude along a great circle, it is also the unit speed is measured in at sea: 1 knot is one nautical mile per hour, which is 1.852 km/h, not 1.609 km/h.

Why does the result have so many decimal places?

Because the conversion factors are exact, not rounded. 1 metre is precisely 3.280839895013123 feet, so the true answer is a repeating decimal that never terminates. The converter computes to 10 decimal places and then strips trailing zeros, which means short results stay clean (1 ft = 12 in shows as exactly 12) while genuinely irrational ones keep their full precision instead of being flattened to something like 3.28.

How do I convert feet and inches to metres?

Put the inch value in the From box and select inches, then choose metres as the target — or simply type your value into whichever box matches the unit you are starting from. Every imperial unit here is an exact multiple of the inch (1 ft = 12 in, 1 yd = 3 ft, 1 mi = 1760 yd), so there is no accumulated rounding error anywhere in the chain.

Length Converter

Free online length converter. Convert m, km, miles, feet, inches, cm. Fast, accurate, runs in your browser.

From

Result

1 m = 3.280839895 ft

Common Conversions

1 inch=2.54 cm

1 foot=30.48 cm

1 yard=0.914 m

1 mile=1.609 km

1 nautical mile=1.852 km

1 meter=3.281 ft

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Frequently Asked Questions about Length Converter

Length Converter — Nine Units, Both Directions, Live

This length converter converts between nine units of length: millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles. Type into either box and the other updates immediately, so you can work in whichever unit you already have. The conversion happens as you type — no button, no waiting.

Every factor used is an exact definition rather than a rounded approximation, which is why the results agree with engineering and surveying references to the last decimal place. All maths is done in your browser.

The Nine Units and Their Exact Definitions

Length units are not arbitrary. Several are exact multiples of others by international agreement, and knowing which are exact and which are not explains most of the surprising results:

Unit	In metres (exact)	Relationship
mm	0.001	Millimetre. Exactly one thousandth of a metre.
cm	0.01	Centimetre. Exactly one hundredth of a metre.
m	1	The base unit. All others are defined against it.
km	1000	Kilometre. Exactly one thousand metres.
in	0.0254	Inch. Defined as exactly 0.0254 m — this is the international inch, fixed since 1959.
ft	0.3048	Foot. Exactly 12 inches.
yd	0.9144	Yard. Exactly 3 feet.
mi	1609.344	Statute mile. Exactly 1760 yards.
nmi	1852	Nautical mile. Exactly 1852 m, agreed internationally in 1929.

Everything derives from the metre, and every imperial unit here is a clean multiple of the inch. So inch, foot, yard and mile are all exactly related to each other with no rounding at all. The nautical mile is different: it is defined directly in metres, which is why it is not a round number of feet.

Common Conversions at a Glance

From	To	Value
1 inch	centimetres	2.54
1 foot	centimetres	30.48
1 yard	metres	0.9144
1 mile	kilometres	1.609344
1 nautical mile	kilometres	1.852
1 metre	feet	3.280839895
1 mile	metres	1609.344
1 foot	inches	12

The result panel also prints the ratio in the form 1 m = 3.280839895 ft, which is useful when you need the multiplier for a calculation of your own.

Miles Versus Nautical Miles

These are genuinely different distances, not different names for the same thing, and confusing them is one of the most common errors in travel and navigation.

A statute mile is 1609.344 m and is used for land distances — road signs, running tracks, and anything on land in the UK, US and most of the world. A nautical mile is exactly 1852 m, about 15% longer, and is used for distances at sea and in aviation. Because a nautical mile was defined by taking one minute of latitude along a great circle, it is also the unit in which speed is expressed at sea: 1 knot is one nautical mile per hour. 10 knots therefore equals 18.52 km/h, not 16.09 km/h.

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Every converter runs locally in your browser — no sign-up, no limits, and it keeps working without a connection once the page has loaded.