Unit Converter Guide: How to Convert Length, Weight, Temperature and More

A unit converter changes a measurement from one unit into another unit within the same category. For example, a length can be converted from meters to feet, or a temperature can be converted from Celsius to Fahrenheit.

Unit converters are useful when information is expressed in a unit different from the one you need for a calculation, document, project, or everyday task.

Unit conversion can involve different conversion factors and, in some cases, different mathematical formulas. An online converter performs the calculation automatically so you do not have to look up and apply each factor manually.

This can be particularly useful when working with several measurements or when you need a quick conversion between commonly used units.

The MartTools Unit Converter supports several measurement categories: length, weight, temperature, volume, area, speed, and digital data.

Each category provides a set of commonly used units that can be selected as the starting and target units.

The length converter supports millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.

These units can be useful for converting measurements between metric and commonly used imperial or US customary units.

The weight converter supports milligrams, grams, kilograms, tonnes, ounces, pounds, and stones.

Weight conversions are useful when measurements need to be expressed in a different unit for a recipe, calculation, document, or other practical task.

The temperature converter supports Celsius, Fahrenheit, and Kelvin.

Temperature conversion is different from many other unit conversions because the scales use different zero points as well as different intervals. The converter therefore uses dedicated temperature formulas rather than a simple multiplication factor.

The volume converter supports milliliters, liters, cubic meters, US gallons, US quarts, US pints, cups, fluid ounces, tablespoons, and teaspoons.

These units cover both metric measurements and several common US volume measurements.

The area converter supports square millimeters, square centimeters, square meters, hectares, square kilometers, square inches, square feet, square yards, acres, and square miles.

Area conversion is useful when comparing the size of spaces or converting measurements between metric and imperial units.

The speed converter supports meters per second, kilometers per hour, miles per hour, feet per second, knots, and Mach.

These units are commonly encountered in transportation, physics, engineering, and other situations involving rates of movement.

The data converter supports bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes.

The converter uses powers of 1024 for these digital data units. This means, for example, that one kilobyte is represented as 1024 bytes in the tool.

Select the measurement category you need, choose the unit you are converting from, choose the target unit, and enter the value. The converted result is calculated automatically.

You can also swap the selected units when you need to perform the conversion in the opposite direction.

A conversion result is only useful when the source and target units are correct. Before copying a result, verify both selected units and the original value.

For measurements used in important calculations, it is also sensible to consider the required level of precision and whether rounding is appropriate for your particular use case.