Unit Converter
A unit converter translates a measurement from one unit into another, which sounds trivial until you meet the cases where it is not. Most conversions are a single multiplication: a metre is 3.28084 feet and that ratio never changes. Temperature is not, because Celsius and Fahrenheit do not share a zero point, so converting between them requires a shift as well as a scale. Digital storage is worse still, because two competing definitions of a gigabyte are both in everyday use and they differ by seven percent. This converter handles 56 units across 9 categories: length, weight, temperature, volume, speed, digital storage, area, pressure, and energy. Where a unit name is ambiguous, such as ton or fluid ounce, both versions are listed separately rather than one being silently assumed. Every conversion runs in your browser with no data sent anywhere, and the sections below explain the cases where the arithmetic is not a simple multiplication.
How to Use the Unit Converter - Step by Step
- Select "Category" - choose from Length, Weight, Temperature, Volume, Speed, Digital Storage, Area, Pressure, or Energy. The unit dropdowns repopulate with only the units belonging to that category, which is why you cannot accidentally ask for metres in kilograms.
- Choose your "From" unit - the unit your number is currently in. Where a name is ambiguous the list disambiguates it: Weight offers both Tonne (metric) and Short Ton (US), and Volume offers Fluid Ounce (US) rather than leaving you to guess which definition applies.
- Choose your "To" unit - the unit you want. Any unit in the category can convert to any other, including combinations that are unusual but occasionally useful, such as square centimetres to acres.
- Enter your "Value" - the number to convert. Decimals are accepted. Large and small numbers are handled without loss of precision, so converting bytes to terabytes gives an exact result rather than a rounded one.
- Read the result - displayed as a full sentence showing your input, the source unit, the converted figure, and the target unit, so the whole conversion is legible rather than a bare number that could be misread.
- Note the precision - results carry six decimal places for most categories and four for temperature. Conversion factors are stored at full published precision rather than rounded, so chained conversions do not accumulate error.
- Check the Digital Storage category carefully if you are converting drive sizes - it offers both the decimal chain (KB, MB, GB, TB, powers of 1000) and the binary chain (KiB, MiB, GiB, TiB, powers of 1024). These are different units and the difference grows with scale. The comparison table below explains which one your operating system uses.
- Use the Copy button to take the result - useful when the figure is going into a spreadsheet, a recipe, or a form where retyping a long decimal invites a transcription error.
How Unit Conversion Works
The number you are converting, in the source unit.
How many of the source unit make up one base unit of the category. Each category has a base unit: metres for length, kilograms for weight, bytes for storage.
How many of the target unit make up one base unit. Dividing by the source factor and multiplying by the target factor moves the value through the base unit.
Almost every conversion is linear, meaning the two units share a zero point and differ only by a scale. Zero metres is zero feet, so the conversion is a single multiplication and works identically at any magnitude. This converter routes every value through a base unit for its category, which keeps one factor per unit rather than one factor per pair, and means adding a unit does not require defining its relationship to every existing unit. Temperature is the exception. Celsius and Fahrenheit have different zero points, so the conversion is affine: it requires a shift as well as a scale. Zero Celsius is 32 Fahrenheit, not zero. Multiplying a Celsius value by a factor would give a wrong answer at every temperature except one, which is why temperature is handled by explicit formulas rather than the factor table. Kelvin shares the Celsius scale but starts at absolute zero, so it needs only an offset of 273.15. One consequence worth knowing: a temperature difference converts differently from a temperature. A rise of 10 degrees Celsius is a rise of 18 degrees Fahrenheit, not 50, because the offset applies to points on the scale and not to intervals between them. This tool converts temperatures, not temperature differences.
Unit Converter - Worked Examples
Example 1 - Following a European Recipe in an American Kitchen
A recipe specifies 500 grams of flour and the kitchen has cup and ounce measures. Selecting Weight, then Grams to Ounces, gives 500 x 35.2739619 / 1000 = 17.64 ounces. Note that this is a weight conversion and stays reliable. Converting a volume such as cups directly to a weight such as grams does not work with any converter, because it depends on what is being measured: one cup of flour is about 125 g while one cup of honey is about 340 g. Weigh ingredients where you can.
Category: Weight - From: Grams - To: Ounces - Value: 500
500 Grams = 17.637 Ounces
Example 2 - Reading a Property Listing in Another Country
A listing gives 1,800 square feet and you think in square metres. Selecting Area, then Square Foot to Square Metre, gives 1800 / 10.7639 = 167.23 square metres. Land is often quoted differently again: a quarter acre is 0.1012 hectares, or 1,012 square metres, which is the sort of figure that makes two listings comparable when one is written for a US audience and the other for a European one.
Category: Area - From: Square Foot - To: Square Metre - Value: 1800
1800 Square Feet = 167.225 Square Metres
Example 3 - Setting Tyre Pressure from a US Manual on a European Gauge
A manual specifies 32 psi and the garage gauge reads in bar. Selecting Pressure, then PSI to Bar, gives 32 / 14.5038 = 2.206 bar. The same value in kilopascals is 32 x 6.89476 = 220.6 kPa, which is what many European gauges display instead. Tyre pressure is a case where getting the unit wrong is not merely inconvenient: inflating to 32 bar rather than 32 psi would be roughly fourteen times the intended pressure.
Category: Pressure - From: PSI - To: Bar - Value: 32
32 PSI = 2.206 Bar
Who Uses the Unit Converter?
Cooks Working from Foreign Recipes
Converting weights and oven temperatures between metric and imperial, where a recipe written in grams and Celsius has to be executed with cup measures and a Fahrenheit dial, and where a mistake in the oven temperature is not recoverable once the dish is in.
People Buying or Renting Property Abroad
Making listings comparable when floor area appears in square feet in one country and square metres in another, and land in acres or hectares depending on the market, so that two properties can actually be judged against each other.
Anyone Working on a Car or a Bicycle
Translating between psi, bar, and kilopascals for tyre pressure, where the manual, the gauge, and the garage may each use a different unit, and where the consequences of a misread figure are immediate.
People Comparing Nutrition Labels
Converting between kilocalories and kilojoules, since US labels print Calories while EU, UK, and Australian labels print kilojoules, and the two differ by a factor of 4.184 which makes an unconverted comparison meaningless.
Common Unit Conversion Mistakes to Avoid
Three different units share the name. A metric tonne is 1,000 kg, a US short ton is 907.185 kg, and a UK long ton is 1,016.047 kg. On a 2,500 kg load that is 2.500 metric tonnes or 2.756 US short tons, a difference of roughly 9 percent. In the US, ton unqualified means the short ton. In most of the rest of the world it means the tonne. This converter lists Tonne (metric) and Short Ton (US) as separate units rather than picking one and hoping, and the long ton is omitted because it is now rare outside specialist shipping contexts.
A gigabyte in the decimal sense is 1,000,000,000 bytes. A gibibyte is 2 to the power of 30, which is 1,073,741,824 bytes, about 7 percent larger. Drive manufacturers sell in decimal units and Windows reports in binary units while labelling them GB, which is why a drive advertised as 1 TB displays as roughly 931 GB. Nothing is missing and nobody is cheating: the two figures describe the same bytes in different units. This converter offers both chains so you can see the relationship directly.
A cup is a volume and a gram is a weight, and no fixed factor connects them, because the answer depends on what is in the cup. One US cup holds about 125 g of flour, 200 g of granulated sugar, 227 g of butter, and 340 g of honey. Any converter that offers cups to grams as a single conversion is giving you the density of one specific substance, usually water, and applying it to everything. Weigh ingredients where precision matters, and use volume for liquids where it does not.
A temperature of 10 degrees Celsius is 50 degrees Fahrenheit. A rise of 10 degrees Celsius is a rise of 18 degrees Fahrenheit. The difference is the 32 degree offset, which applies to points on the scale but not to intervals between them. For a difference, multiply by 9/5 and omit the offset entirely. This converter handles temperatures, so if you are working with a change in temperature rather than a temperature, apply the scale factor yourself.
The Nine Categories and What Each Covers
Every category converts between any two of its units. Digital Storage carries two parallel chains, decimal and binary, because both are in everyday use and the difference between them is the source of the most common question about drive sizes.
| Category | Units | Base Unit | Worth Knowing |
|---|---|---|---|
| Length | 8 | Metre | Metric and imperial, millimetres through miles |
| Weight | 7 | Kilogram | Tonne and short ton listed separately |
| Temperature | 3 | Celsius | Affine, not linear: requires an offset |
| Volume | 6 | Litre | Fluid ounce is the US definition |
| Speed | 4 | km/h | Includes knots at 1.852 km/h exactly |
| Digital Storage | 9 | Byte | Decimal KB to TB and binary KiB to TiB |
| Area | 7 | Square Metre | Includes acres and hectares for land |
| Pressure | 6 | Kilopascal | psi, bar, kPa, atmospheres, torr |
| Energy | 6 | Kilojoule | kcal to kJ for nutrition labels |
Verification of the storage figures, which are the ones most often disputed. One terabyte in the decimal sense is 10 to the power of 12, or 1,000,000,000,000 bytes. One gibibyte is 2 to the power of 30, or 1,073,741,824 bytes. Dividing gives 1,000,000,000,000 / 1,073,741,824 = 931.32 GiB, which is why a 1 TB drive displays as approximately 931 GB in an operating system that reports binary units under a decimal label. In tebibytes the same drive is 1,000,000,000,000 / 1,099,511,627,776 = 0.9095 TiB. Verification of the tonne figures: 2,500 / 1,000 = 2.500 metric tonnes, and 2,500 / 907.18474 = 2.756 US short tons, a difference of 9.3 percent. Verification of the pressure example: 32 / 14.5038 = 2.2063 bar, and 32 x 6.89476 = 220.63 kilopascals. All confirmed.
Frequently Asked Questions
Why Use the Unit Converter on GlobalUtilityHub?
The Unit Converter is part of our collection of 68 free online utilities designed to make your life easier. We understand that in today's fast-paced digital world, you need tools that are not only accurate but also respect your time and privacy. That's why our unit converter runs entirely on the client side, meaning your data is processed instantly in your browser and never sent to any server.
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