Unit Converter

How to Use This Unit Converter

1. Pick a categorySelect a category from the tabs at the top: Length, Weight, Temperature, Volume, Area, Speed, Data, or Time. Each category contains all commonly used units for that measurement type.
2. Choose source and target unitsChoose your source unit from the left dropdown and your target unit from the right dropdown. Enter a value in either field and the conversion calculates instantly. You can also click the swap button between the dropdowns to reverse the conversion direction.
3. Scan the full reference tableBelow the converter, you'll see a reference table showing your entered value converted to all available units in the selected category at once. This is helpful when you need multiple conversions quickly.
4. Trust the precisionThe tool supports decimal precision up to 10 significant figures. For temperature conversions, the formulas account for offset-based calculations (Celsius to Fahrenheit uses the standard formula, not a simple ratio).
5. Jump between everyday conversionsCommon conversions like miles to kilometers, pounds to kilograms, and Fahrenheit to Celsius are always one click away.

What is Unit Conversion?

Unit conversion is the process of expressing a measurement in a different unit while preserving the same quantity. One inch equals 2.54 centimeters — the physical length doesn't change, only the number and unit used to describe it. An online unit converter removes the math and rounding errors that come with manual conversion.

Metric vs. imperial vs. SI

The need for unit conversion arises because different countries and industries use different measurement systems. The metric system (meters, kilograms, liters) is used by most of the world, while the United States primarily uses the imperial system (feet, pounds, gallons). Scientists universally use SI (International System of Units), which is based on the metric system.

Length conversions you'll hit daily

Length conversions are among the most common, especially between metric and imperial. The relationship between meters and feet, kilometers and miles, or centimeters and inches comes up constantly in travel, construction, manufacturing, and everyday life.

Weight, mass, and temperature

Weight and mass conversions bridge the gap between kilograms and pounds, grams and ounces. Temperature conversion between Celsius, Fahrenheit, and Kelvin is unique because it involves both multiplication and addition (it's not a simple ratio like most other conversions).

Digital data units

Digital data units follow a binary-based system where each step is a factor of 1,024: bytes to kilobytes, megabytes, gigabytes, and terabytes. Understanding these conversions is increasingly important as data storage and internet speeds are part of daily decision-making.

Volume: where US and Imperial diverge

Volume conversions can be particularly confusing because the same term can mean different quantities in different systems — a US gallon (3.785 liters) differs from an Imperial gallon (4.546 liters).

Supported Unit Conversion Categories

• LengthMillimeter, centimeter, meter, kilometer, inch, foot, yard, mile, nautical mile.
• Weight / massMilligram, gram, kilogram, metric ton, ounce, pound, stone, short ton.
• TemperatureCelsius, Fahrenheit, Kelvin — with exact offset-based formulas.
• VolumeMilliliter, liter, cubic meter, teaspoon, tablespoon, cup, pint, quart, US gallon, Imperial gallon, fluid ounce.
• AreaSquare meter, square kilometer, square foot, square yard, acre, hectare.
• SpeedMeters per second, km/h, mph, knots, feet per second.
• Data / storageByte, KB, MB, GB, TB, PB — with both decimal (1,000) and binary (1,024) options.
• TimeSecond, minute, hour, day, week, month, year.

Common Unit Conversions at a Glance

• 1 meter= 3.28084 feet = 39.3701 inches
• 1 kilometer= 0.621371 miles; 1 mile = 1.60934 km
• 1 kilogram= 2.20462 pounds; 1 pound = 0.453592 kg
• 0 °C= 32 °F = 273.15 K; 100 °C = 212 °F
• 1 liter= 0.264172 US gallons = 33.814 US fl oz
• 1 hectare= 2.47105 acres = 10,000 m²
• 1 GB= 1,000 MB (decimal) or 1,024 MiB (binary)
• 60 mph= 96.5606 km/h; 100 km/h = 62.1371 mph

When You'll Use a Unit Converter

• International travelQuickly convert kilometers to miles, Celsius to Fahrenheit, and liters to gallons.
• Recipes and cookingSwitch between grams and ounces, cups and milliliters, teaspoons and tablespoons.
• DIY and constructionConvert meters to feet, square feet to square meters, and inches to centimeters for cutting and framing.
• Fitness and weight trackingTrack body weight in kg or lbs and running distances in km or miles.
• Tech and storageTranslate bandwidth (Mbps vs MB/s) and storage (GB vs GiB) for accurate planning.
• Science and engineeringConvert SI units for physics, chemistry, and engineering problem sets.
• Shipping and logisticsWeight (kg/lbs), dimensions (cm/in), and volume (L/gal) for courier and customs forms.
• Automotivempg to L/100km, mph to km/h, PSI to bar.

Frequently Asked Questions