Inches Converter
Convert Inches (in) to any other length unit. The table below gives the exact figure for each unit, and every conversion is worked from the same engine as the converter.
What inches convert to
One in in every other length unit.
| Unit | 1 in | Reverse |
|---|---|---|
| Millimeters | 25.4 mm | 0.03937 in |
| Centimeters | 2.54 cm | 0.393701 in |
| Meters | 0.0254 m | 39.370079 in |
| Kilometers | 2.54e-5 km | 39,370.07874 in |
| Feet | 0.083333 ft | 12 in |
| Yards | 0.027778 yd | 36 in |
| Miles | 1.5783e-5 mi | 63,360 in |
| Nautical miles | 1.3715e-5 nmi | 72,913.385827 in |
Multiply a inches figure by the figure in the second column to get the unit in the first, or multiply by the third column to go the other way.
Inches conversion reference
Inches to Millimeters
One inches is 25.4 millimeters, and one millimeters is 0.03937 inches.
A millimeter is one thousandth of a meter. It is the unit for precision work — engineering tolerances, rainfall, wire gauges and the thickness of paper or sheet metal.
- 1 in= 25.4 mm
- 5 in= 127 mm
- 10 in= 254 mm
Inches to Centimeters
One inches is 2.54 centimeters, and one centimeters is 0.393701 inches.
A centimeter is one hundredth of a meter. It is the everyday metric unit for short distances: body measurements, clothing sizes, furniture and school rulers.
- 1 in= 2.54 cm
- 5 in= 12.7 cm
- 10 in= 25.4 cm
The centimeter is exactly one hundredth of a meter, written 0.01 m, and it is the unit most metric rulers and tape measures are marked in, with ten millimeters to one centimeter.
It appears on clothing labels, school rulers, rainfall reports and body measurements, and in medicine for wound sizes. A person's height is commonly recorded in centimeters on metric forms.
Inches to Meters
One inches is 0.0254 meters, and one meters is 39.370079 inches.
The meter is the SI base unit of length, defined as the distance light travels in a vacuum in 1/299,792,458 of a second. It is used for room sizes, heights, fabric and track distances.
- 1 in= 0.0254 m
- 5 in= 0.127 m
- 10 in= 0.254 m
The meter is the base unit of length in the International System, defined by the distance light travels in a vacuum in 1/299,792,458 of a second.
It measures room dimensions, fabric sold by the metre, athletic tracks, water depth and building heights. Scientific work uses meters and its decimal multiples, from nanometers to gigameters, almost everywhere outside everyday imperial trade.
Inches to Kilometers
One inches is 2.54e-5 kilometers, and one kilometers is 39,370.07874 inches.
A kilometer is 1,000 meters. It is the standard unit for road distances and speed limits, and the one used on road signs and by police across Tanzania and most of the world.
- 5 in= 1.27e-4 km
- 10 in= 2.54e-4 km
- 25 in= 6.35e-4 km
The kilometer is exactly 1,000 meters, the unit of length in the International System used for distances between places rather than across a room. It is written km and is the basis of the metric road network.
Road signs, speed limits, odometers and race distances use kilometers in most of the world. Maps quote distances in kilometers, and athletic events such as the marathon are described in kilometers.
Inches to Feet
One inches is 0.083333 feet, and one feet is 12 inches.
A foot is exactly 0.3048 meters, or 12 inches. It is used for height, altitude in aviation and room dimensions wherever imperial measurements are standard.
- 1 in= 0.083333 ft
- 5 in= 0.416667 ft
- 10 in= 0.833333 ft
The foot is exactly 0.3048 meters, or twelve inches. United States survey work has used a separate survey foot, defined as 1200/3937 meters and equal to about 0.3048006 meters.
Aviation uses feet for altitude and flight levels worldwide, even in countries that measure road distance in kilometers. Building heights, room dimensions, timber and, in some places, body height are also quoted in feet.
Inches to Yards
One inches is 0.027778 yards, and one yards is 36 inches.
A yard is exactly 0.9144 meters, or 3 feet. It is the unit for fabric and carpet sales, and for sports distances such as the 22-yard cricket pitch.
- 1 in= 0.027778 yd
- 5 in= 0.138889 yd
- 10 in= 0.277778 yd
The yard is exactly 0.9144 meters, three feet or thirty-six inches. It is a defined multiple of the meter, not an independent standard. Its value was fixed by the same international agreement that defined the foot and the inch.
Fabric, carpet and some flooring are still sold by the yard, and the chain and furlong used in land and horse racing are built from yards. American football is measured in yards.
Inches to Miles
One inches is 1.5783e-5 miles, and one miles is 63,360 inches.
A mile is exactly 1,609.344 meters, or about 1.609 kilometers. It is the standard road-distance unit in the United States and the United Kingdom.
- 10 in= 1.5783e-4 mi
- 25 in= 3.9457e-4 mi
- 100 in= 0.001578 mi
The international mile is exactly 1,609.344 meters, or 1.609344 kilometers. It descends from the Roman mile of a thousand paces and remains the standard road distance in the United States and the United Kingdom.
Road signs and speed limits, distance markers on highways, running and cycling events and aviation track distances are quoted in miles in those countries. Nautical miles are separate and longer.
Inches to Nautical miles
One inches is 1.3715e-5 nautical miles, and one nautical miles is 72,913.385827 inches.
A nautical mile is exactly 1,852 meters — one minute of latitude. It is the standard unit for maritime and air navigation, which is why ship and aircraft speeds are given in knots per hour.
- 10 in= 1.3715e-4 nmi
- 25 in= 3.4287e-4 nmi
- 100 in= 0.001371 nmi
What inches are used for
An inch is exactly 2.54 centimeters. It remains the standard unit for screen sizes, pipe and hose diameters, and tool sizes in imperial-measure countries.
An inch is exactly 2.54 centimeters, or 25.4 millimeters. Twelve inches make one foot and thirty-six make a yard, so the inch sits inside two larger imperial units.
Screen and tyre sizes are given in inches, as are pipe and hose diameters, wrench openings and the diagonal of a television. Rainfall is still recorded in inches in some countries.
Because the inch has an exact metric value, converting to millimeters or centimeters introduces no error beyond display rounding. This site shows at most six decimal places, so very small fractions may appear shortened.
A frequent mistake is reading a pipe size as an exact outside diameter when trade sizes are nominal. Another is converting inches to centimeters and then labelling the answer millimeters.
People confuse inches with centimeters most often of all, then with feet. Screen and pipe sizes are inches, while fabric and body measurements may be either, and a twelvefold confusion between inches and feet is the usual consequence of misreading a unit label in practice.
Metric-to-metric conversions are exact. Imperial figures are exact by definition but are rounded for display, so a value converted back and forth can differ in the final digit.
Inside the metric units every length conversion is a shift of the decimal point, so millimeters to centimeters, meters to kilometers and the rest can be done by moving it. Which way, and how far, follows from the prefix alone.
Converting between metric and imperial is not a shift but a single exact multiplication, and the factor is the same one for that pair however large or small the value. The trap is mixing the two systems halfway, as when a distance is stated in meters and inches in the same sentence.
To check a length conversion, run it backwards, or convert through a familiar middle value such as a meter or a foot. The one thing to keep straight is pairs that differ by a thousand rather than by ten, since those are where a misplaced decimal point survives unnoticed.
Tanzania reference points
Real quantities, converted into inches.
Uhuru Peak on Mount Kilimanjaro, the highest point in Africa
5,895 m = 232,086.614173 in
The datasheet also records Kilimanjaro as rising 4,877 m above the surrounding plains.
Source: UNEP-WCMC World Heritage datasheet — Kilimanjaro National Park · verified 2026-09-14
Marangu Gate, the main road entrance to Kilimanjaro National Park
1,830 m = 72,047.244094 in
Source: UNEP-WCMC World Heritage datasheet — Kilimanjaro National Park · verified 2026-09-14
How far Mount Kilimanjaro rises above the plains around it
4,877 m = 192,007.874016 in
Source: UNEP-WCMC World Heritage datasheet — Kilimanjaro National Park · verified 2026-09-14
Inches conversion tables
Inches to Millimeters
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
Inches to Centimeters
| Inches (in) | Centimeters (cm) |
|---|---|
| 1 | 2.54 |
| 2 | 5.08 |
| 3 | 7.62 |
| 4 | 10.16 |
| 5 | 12.7 |
| 10 | 25.4 |
| 25 | 63.5 |
| 50 | 127 |
| 100 | 254 |
Inches to Meters
| Inches (in) | Meters (m) |
|---|---|
| 1 | 0.0254 |
| 2 | 0.0508 |
| 3 | 0.0762 |
| 4 | 0.1016 |
| 5 | 0.127 |
| 10 | 0.254 |
| 25 | 0.635 |
| 50 | 1.27 |
| 100 | 2.54 |
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