Length Unit Converters: Metric, Imperial and Nautical

Convert length and distance measurements between metric, imperial, and nautical units. Use Meters to Feet for a quick conversion, or choose the Length Universal Converter when you need to switch between different units. The Yarn Count calculator helps you work with the relationship between yarn length and weight.These tools are useful for students, travelers, makers, and anyone checking measurements for a project or purchase. Enter your value and select the units you need to see the result.

mm to Inches

Convert millimeters to inches and back in one step, with the exact decimal result plus the nearest fractional inch (down to 1/64 in) and the rounding error. Just type your value in either field.

Paper Sizes

Look up the exact dimensions of any ISO A, B or C series paper size or North American size (Letter, Legal, Tabloid, ANSI) in millimetres, centimetres or inches, together with area and aspect ratio.

Feet and Inches

Add, subtract, multiply, or divide lengths in feet and fractional inches, or convert decimal feet or centimeters. Enter your measurements and choose how precisely to display the inch fraction.

Yarn Count

Calculate yarn count from the number of bundles, the length of each bundle in meters, and the total yarn weight in grams. The result is meters per gram, numerically equal to metric yarn count (Nm).

Map Scale

Convert between map distance, real-world distance and map scale (representative fraction 1:N). Enter what you know — for example, a measured map distance and the scale — and get the missing value instantly.

cm to Inches

Convert centimeters to inches (or inches back to centimeters) instantly. Enter a value in either field and get the result plus feet + inches and fractional inches to the nearest 1/16.

Length Universal Converter

Convert a length or distance between meters, centimeters, millimeters, kilometers, inches, feet, yards, miles, and nautical miles. Enter a value, then choose the From unit and To unit.

Meters to Feet

Convert a length from meters to feet. Enter a nonnegative value in the Length in meters field to see the equivalent in feet.

Miles to km

Convert miles to kilometers and kilometers back to miles, plus mph to km/h and running pace (min/mi to min/km). Type a value into either field of a pair and the converter updates the rest instantly.

Linear Feet

Add up linear feet for boards, trim, moldings, fencing and decking — enter piece lengths with quantities, or convert an area in ft² to linear feet from the board width, and get total cost per linear or board foot.

Calculators