Convert between different units of measurement with our free, accurate, and easy-to-use conversion tools.
Convert between meters, feet, inches, kilometers, miles, and more.
Convert distances between miles, kilometers, nautical miles, and more.
Convert between mph, km/h, m/s, knots, and other speed units.
Convert height between feet/inches, centimeters, and meters.
Convert between light-years, parsecs, astronomical units, and kilometers.
Convert between nautical miles, miles, kilometers, and leagues.
Convert between chains, rods, furlongs, and standard units.
Convert between pixels, points, picas, and millimeters for displays and printing.
Convert between yards, meters, ells, and other textile measurements.
Convert between nanometers, micrometers, and frequency for electromagnetic waves.
Convert between square meters, square feet, acres, hectares, and more.
Calculate square footage for rooms and buildings of various shapes.
Convert between acres, hectares, square miles, and square kilometers.
Calculate area from radius or diameter in different units.
Calculate triangle area using various methods and inputs.
Calculate surface area of 3D shapes including spheres, cubes, and cylinders.
Calculate roof area for different roof types including pitch correction.
Calculate wall area and required paint volume for interior/exterior painting.
Calculate floor/wall area and number of tiles needed for projects.
Calculate area of irregular shapes using coordinate points or divisions.
Calculate area for mulch, sod, and other landscaping materials.
Calculate carpet area and estimate flooring materials needed.
Convert between kilograms, pounds, ounces, grams, stones, and more.
Convert between kg/m³, g/cm³, lb/ft³, and other density measurements.
Convert between newton meters, foot-pounds, inch-pounds, and more.
Convert between newtons, pounds-force, dynes, and other force units.
Convert between liters, gallons, cubic meters, cubic feet, and more.
Convert between teaspoons, tablespoons, cups, pints, quarts, and more.
Convert between liters per second, gallons per minute, cubic meters per hour, and more.
Convert between mpg, km/L, L/100km and other fuel consumption units.
Convert between Celsius, Fahrenheit, Kelvin, and Rankine temperature scales.
Convert between joules, calories, BTUs, and other heat energy units.
Convert between various thermal conductivity measurement units.
Convert between thermal expansion coefficients in different unit systems.
Convert between seconds, minutes, hours, days, weeks, months, and years.
Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes.
Convert between pascals, bars, psi, atmospheres, and other pressure units.
Convert between joules, calories, electron volts, kilowatt-hours, and more.
Convert between watts, horsepower, BTU/hour, and other power units.
Convert between degrees, radians, gradians, and other angle units.
Convert between hertz, kilohertz, megahertz, gigahertz, and more.
Convert between pixel dimensions, document sizes, and image resolutions.
The metric system (used in most countries) is based on powers of 10, making conversions simpler. For example, 1 kilometer = 1,000 meters. The imperial system (used primarily in the US) has less consistent ratios between units. For example, 1 mile = 5,280 feet. Our conversion calculators handle both systems seamlessly.
Our conversion calculators use precise conversion factors and mathematical formulas to ensure accuracy to many decimal places. For everyday use, our calculators are more than sufficient. For highly specialized scientific or engineering applications, you may need to verify the precision required for your specific field.
The US gallon (3.785 liters) and UK/Imperial gallon (4.546 liters) evolved separately. The US gallon is based on the wine gallon defined in 1707, while the Imperial gallon was defined later as the volume of 10 pounds of water. Our volume converter specifies which gallon type is being used to avoid confusion.
A nautical mile (1.852 kilometers) is based on the Earth's geography - specifically, one minute of latitude along any meridian. This makes it useful for navigation purposes. A regular mile (1.609 kilometers) has historical origins based on Roman measurements. Nautical miles are primarily used in maritime and aviation contexts.
To convert Celsius to Fahrenheit: multiply by 9/5 and add 32 (°F = °C × 9/5 + 32). To convert Fahrenheit to Celsius: subtract 32 and multiply by 5/9 (°C = (°F - 32) × 5/9). Our temperature converter handles these calculations automatically.
Mass is a measure of the amount of matter in an object and remains constant regardless of location. Weight is the force of gravity acting on that mass and varies depending on the gravitational field. On Earth, we often use the terms interchangeably, but they have different units in physics: mass is measured in kilograms, while weight is measured in newtons.
There are two standards for data storage conversion: binary and decimal. In the binary system (used by computers), 1 kilobyte = 1,024 bytes (2^10), while in the decimal system (often used by hard drive manufacturers), 1 kilobyte = 1,000 bytes (10^3). Our data converter allows you to choose which system to use for your calculations.
Fuel efficiency is measured differently around the world. The US uses miles per gallon (MPG), most of Europe uses liters per 100 kilometers (L/100km), and some countries use kilometers per liter (km/L). These measurements are inversely related - a higher MPG or km/L means better efficiency, while a lower L/100km means better efficiency.
No, cooking measurements vary by country. US recipes typically use volume-based measurements (cups, tablespoons), while many other countries use weight (grams). Additionally, a US tablespoon (14.8 ml) differs from an Australian tablespoon (20 ml). Our liquid measure converter accounts for these regional differences to ensure your recipes turn out correctly.
For complex scientific calculations involving multiple unit conversions, we recommend breaking down the problem into individual steps. Convert each measurement to a standard unit (often SI units like meters, kilograms, seconds), perform your calculations, and then convert the result back to your desired unit. This approach minimizes compounding conversion errors.