Unit Converter

From cooking to construction, from science to shopping, unit conversion is one of those things you need all the time but never quite remember the formulas for. How many kilometers is a 5K race? What's 200 pounds in kilograms? How many liters in a gallon? The Unit Converter is your universal translator for measurements. It covers length, weight, volume, temperature, speed, pressure, energy, power, area, and data storage — all in one place. Whether you're a student doing homework, a traveler trying to understand foreign measurements, a DIY enthusiast following plans in different units, or a professional who needs quick conversions without leaving the browser, this tool handles hundreds of unit combinations with just a few clicks.

What Is

A unit converter is a comprehensive tool that translates measurements between different units across all major categories of physical quantities. Unlike specialized converters that handle only one type (like length or temperature only), a universal unit converter covers dozens of measurement categories: length (meters, feet, inches, kilometers, miles, etc.), weight/mass (grams, kilograms, pounds, ounces), volume (liters, gallons, cups, milliliters), temperature (Celsius, Fahrenheit, Kelvin), speed (mph, km/h, knots, m/s), pressure (bar, psi, pascal, atm), energy (joules, calories, kWh, BTU), power (watts, horsepower), area (square meters, square feet, acres, hectares), and data storage (bytes, KB, MB, GB, TB). The converter uses standardized conversion factors for each unit pair and maintains precision across all calculations. It's the go-to tool when you need to convert between units quickly without searching for specific formulas or conversion charts. The tool saves students, engineers, scientists, cooks, travelers, and professionals countless time by having every conversion in one accessible place.

How to Use

Select the measurement category you need: length, weight, volume, temperature, speed, pressure, energy, power, area, or data storage.
Choose your source unit from the input dropdown. For example, in the length category you might select miles, feet, inches, kilometers, meters, centimeters, or millimeters.
Enter the value you want to convert. The tool accepts whole numbers, decimals, and very large or small values.
Select your target unit from the output dropdown. The converted value appears instantly with full precision.
Optionally view a list of common conversions for your input value — for example, entering 1 mile can show you the equivalent in all other length units at once. Copy any result for use in your work.

Examples

Input: Convert 10 km to miles

Process: 10×0.6214=6.214

Result: 10km=6.214miles

Input: Convert 100 cm to inch

Process: 100×0.3937=39.37

Result: 100cm=39.37inch

Input: Convert 5 kg to lbs

Process: 5×2.2046=11.023

Result: 5kg=11.023lbs

Frequently Asked Questions

How accurate are the conversions?

Conversions use internationally standardized conversion factors maintained by organizations like the International Bureau of Weights and Measures (BIPM) and the National Institute of Standards and Technology (NIST). For most unit pairs, the conversion is exact by definition (1 inch = exactly 2.54 centimeters, defined in 1959). For others, the conversion factors are known to extremely high precision. The tool displays results with sufficient decimal places for practical use while avoiding misleading false precision. For critical scientific or engineering applications, verify that the displayed precision meets your requirements.

What's the difference between weight and mass in unit conversion?

Mass is the amount of matter in an object (measured in kilograms or pounds-mass), while weight is the force of gravity on that object (measured in newtons or pounds-force). In everyday usage, people say 'weight' when they mean 'mass' — your 'weight' in kilograms is actually your mass. The unit converter treats pounds and kilograms as units of mass for practical conversion purposes. The distinction matters in physics: a 70 kg person has the same mass on Earth and the Moon, but their weight is about 6 times greater on Earth. For everyday conversions (cooking, shipping, personal weight), treating them as equivalent is standard practice.

Can I convert between imperial and metric units?

Absolutely — that's one of the most common uses of the unit converter. The imperial (UK) and US customary systems both convert to metric (SI) using standard factors. For example: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.60934 km, 1 pound = 0.453592 kg, 1 gallon (US) = 3.78541 liters, 1 gallon (imperial) = 4.54609 liters. Note that US and imperial gallons are different volumes — the US gallon is about 3.785 liters while the imperial gallon is about 4.546 liters. The converter specifies which gallon it's using to avoid confusion.

How many unit categories can I convert between?

A comprehensive unit converter typically covers 10+ major categories with hundreds of individual units. The main categories include: length (20+ units from angstroms to light-years), weight/mass (15+ units from milligrams to tons), volume (15+ units including US and imperial variants), temperature (Celsius, Fahrenheit, Kelvin, Rankine), speed (mph, km/h, m/s, knots, Mach), pressure (pascal, bar, psi, atm, mmHg), energy (joules, calories, kWh, BTU, electronvolts), power (watts, horsepower, BTU/hr), time (seconds, minutes, hours, days, weeks, years), angle (degrees, radians, gradians), and data storage (bytes through petabytes). The converter makes any unit within a category convertible to any other unit in that category.

Is there a difference between a gallon in the US and a gallon in the UK?

Yes, they're significantly different volumes. A US gallon equals exactly 3.78541 liters (231 cubic inches), while an imperial (UK) gallon equals exactly 4.54609 liters. The imperial gallon is about 20% larger than the US gallon. This difference dates back to the 19th century when the two systems diverged. Canada, Australia, and New Zealand officially use metric, but you might still encounter imperial gallons in some contexts. When converting gallons using the tool, make sure you know whether the source is US or imperial gallons — confusing them can lead to significant errors in recipes, fuel calculations, or any volume-related measurements.

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