Unit Conversion

Unit and measurement conversion calculators

Last updated September 6, 2026

CloudCalcApp's unit conversion calculators convert a measurement from one unit to another using exact, standards-based conversion factors rather than rounded approximations. The Length Converter handles the common metric and imperial length units - millimeters, centimeters, meters, and kilometers alongside inches, feet, yards, and miles - by converting through a single canonical base unit, which keeps the result accurate even across large unit jumps.

Converting through a base unit matters because chaining conversions - inches to centimeters to meters, say - compounds a small rounding error at every step. Reducing every input to one reference unit (meters, here) and expanding once to the target unit means a single rounding step and a result that round-trips cleanly. The factors themselves come from the internationally agreed definitions: one inch is exactly 25.4 millimeters, one mile is exactly 1,609.344 meters, and the metric units are exact powers of ten.

Every conversion is calculated in your browser, and the calculator shows both the factor it applied and the arithmetic, so a conversion is transparent rather than a black box. This section also has converters for weight, volume, temperature, area, speed, and digital storage.

Calculators

Length Converter

Length

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles - enter a value and choose your From and To units.

Weight Converter

Weight & Mass

Convert kg, pounds, ounces, grams, stone and tons. Uses the exact 1 lb = 0.45359237 kg, with a reference table and tonne vs US and UK ton.

Volume Converter

Volume

Convert between milliliters, liters, cubic meters, and US fluid ounces, cups, pints, quarts, and gallons - enter a value and choose your From and To units.

Temperature Converter

Temperature

Convert between Celsius, Fahrenheit, and Kelvin - enter a temperature and choose your From and To scales. Negative temperatures are accepted; values below absolute zero are not.

Area Converter

Area

Convert between square millimeters, square centimeters, square meters, hectares, square kilometers, square inches, square feet, square yards, acres, and square miles - enter a value and choose your From and To units.

Speed Converter

Speed

Convert between meters per second, kilometers per hour, miles per hour, knots, and feet per second - enter a value and choose your From and To units.

Digital Storage Converter

Digital Storage

Convert between bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes - enter a value and choose your From and To units. Uses the decimal (1000-based) convention: 1 KB = 1,000 bytes.