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Convert a length from one unit to another across metric and imperial units.
Example
Convert 5 feet to inches: 5 ft × 0.3048 = 1.524 m, then 1.524 ÷ 0.0254 = 60 inches.
How it works
Each unit has an exact factor relative to one meter; the input value is converted to meters and then divided by the target unit's factor to get the result.
Good to know
The Length Conversion Calculator turns a measurement in one unit into its equivalent in another, covering eight common length units: millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Enter a value, pick the unit you have under "From," pick the unit you want under "To," and the result updates instantly. It is handy for anyone bridging the metric and imperial systems, such as DIY builders following overseas plans, students checking homework, travelers reading distances, sewists and crafters, or engineers double-checking a spec sheet.
Reach for it whenever a number is in the "wrong" unit for the job, for example converting a 5 ft height to inches for a height chart, a 26.2 mile marathon to kilometers, or a 2400 mm board length to feet. Because every unit is defined relative to exactly one meter, the tool pivots through meters internally: your value is first expressed in meters, then divided by the target unit's factor, so any pair of units can be converted without a special lookup table.
Three readouts help you sanity-check the math. The large "Result" is your answer; the "In meters" field shows the same length in SI units, which is useful as a neutral reference point; and the "Conversion" line gives the unit rate (for example, 1 m = 39.3701 in) so you can scale other quantities by hand or spot an obvious mistake at a glance.
One practical note: the displayed numbers are rounded for readability, with more decimal places shown for very small values and fewer for large ones, so a value like 60 inches may appear clean while another lands on a long decimal. The underlying factors are exact, so if you need full precision for fabrication or legal documents, keep more digits by working from the meter value rather than the rounded result, and remember this tool handles length only, not area or volume.
Frequently asked questions
How many inches are in one meter?
One meter equals 1 / 0.0254 = 39.3701 inches, since an inch is defined as exactly 0.0254 meters.
Are these conversions exact?
Yes. The factors used (1 in = 0.0254 m, 1 ft = 0.3048 m, 1 yd = 0.9144 m, 1 mi = 1609.344 m) are exact international definitions, so results are limited only by display rounding.
Is my data uploaded anywhere?
No — this calculator runs entirely in your browser. Your inputs never leave your device, and it works offline once loaded.
Is this calculator free?
Yes, completely free with no sign-up and no limits.
People also ask
How do I convert centimeters to feet?
Multiply the centimeter value by 0.01 to get meters, then divide by 0.3048. For example, 180 cm = 1.8 m, and 1.8 / 0.3048 = about 5.91 feet. The calculator does both steps automatically when you select cm as From and feet as To.
How many feet are in a mile?
There are exactly 5,280 feet in a mile, because a mile is defined as 1609.344 meters and a foot as 0.3048 meters (1609.344 / 0.3048 = 5,280).
What is the difference between metric and imperial length units?
Metric units (mm, cm, m, km) are based on the meter and scale by powers of ten, while imperial units (inches, feet, yards, miles) use fixed historical ratios such as 12 inches per foot and 3 feet per yard. This calculator converts freely between both systems.
How do I convert millimeters to inches?
Divide the millimeter value by 25.4, since one inch equals exactly 25.4 millimeters. For instance, 100 mm / 25.4 = about 3.94 inches.
Why does my converted result show a long string of decimals?
Most conversions between metric and imperial units do not divide evenly, so the exact answer is a repeating or non-terminating decimal. The tool rounds the display for readability, but the calculation itself uses exact international factors.
Can I use this calculator to convert area like square feet?
No. This tool converts one-dimensional length only. Converting area requires squaring the length factor (for example, 1 square meter is about 10.764 square feet), so use a dedicated square footage or area converter instead.
What is the exact definition of an inch in meters?
An inch is defined as exactly 0.0254 meters under the international agreement adopted in 1959. This makes inch-to-metric conversions exact rather than approximate.
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