Unit Converter

About the Unit Converter

The Unit Converter handles the conversions people need every day in one place. Choose one of eight categories — length, weight and mass, temperature, area, volume, speed, data storage or time — enter a value, pick the units to convert from and to, and the answer appears instantly with a table showing the same value in every other unit of that category.

It covers 82 units, from millimetres and miles to pounds, gallons, knots, kibibytes and hours. It also includes units used in Pakistan and South Asia, such as tola, maund, marla and kanal, with their definitions in the labels. Students, cooks, travellers, online shoppers, engineers and property buyers can use it without installing an app, and it works offline once the page has loaded.

What is unit conversion?

A unit is an agreed amount used to measure something: a metre for length, a kilogram for mass, a litre for volume. Different countries and trades use different systems. The metric system (SI) is used officially in Pakistan and most of the world, while the United States uses US customary units such as feet, pounds and gallons, and the UK still uses some imperial units such as miles and pints.

Converting between units means multiplying by a conversion factor. Many are exact by definition: one inch is exactly 2.54 centimetres, so a foot is exactly 0.3048 metres, and a pound is exactly 0.45359237 kilograms. This converter stores each unit relative to a base unit and converts through it, so any pair of units in a category can be converted.

Temperature is different, because the scales have different zero points. Celsius to Fahrenheit is not a simple multiplication: °F = °C × 9/5 + 32. The converter therefore converts temperatures through Kelvin. Data storage has two systems too: decimal units (1 GB = 1,000,000,000 bytes) used by drive makers, and binary units (1 GiB = 1,073,741,824 bytes) used by many operating systems.

How to use the Unit Converter

1. Choose a category from the buttons at the top: Length, Weight & mass, Temperature, Area, Volume, Speed, Data storage or Time.
2. Enter the Value you want to convert. Decimals and negative numbers (for temperature) are accepted.
3. Choose the unit to convert From and the unit to convert To.
4. Read the result and the formula underneath, or scroll the All conversions table to see the value in every unit of the category.
5. Use Swap units to reverse the conversion, Copy result to copy it, or Reset to return to the defaults.

Each category opens with a common pair already selected, such as metres to feet or kilograms to pounds, so many conversions need only a number.

Key features and benefits

• 8 categories, 82 units. Length, weight, temperature, area, volume, speed, data storage and time
• Full equivalents table. See your value in every unit of the category at once
• Exact factors. International definitions are used where they exist, such as 0.3048 m per foot
• Pakistan and South Asian units. Tola, maund, marla and kanal (both 272.25 and 225 sq ft marla) with their definitions
• Decimal and binary data units. MB and GB alongside MiB and GiB, plus bits for network speeds
• Swap and copy. Reverse a conversion in one click and copy the result
• Offline and private. All maths happens in your browser

Practical examples

Height in feet to metres

5 feet 6 inches is 5.5 ft. Length, 5.5 ft to m: 1.6764 m. Swapping and entering 1.75 m gives 5.74 ft.

Weather and cooking temperatures

30 °C is 86 °F; an oven at 180 °C is 356 °F; and −40 is the one temperature that is the same in both scales.

Gold and grocery weights

One tola is 11.6638 grams, the standard bullion value used in the converter, so 10 grams is about 0.857 tola. One maund is 40 seers, defined here as 37.32 kg, still heard in agricultural markets.

Hard drive capacity

A drive sold as 500 GB holds 500,000,000,000 bytes. Converted to GiB, the unit many computers display, that is 465.66 GiB, which is why the drive looks smaller than advertised.

Speed and fuel

100 km/h is 62.14 mph. In the volume category, one US gallon is 3.785 litres, while one UK gallon is 4.546 litres, a difference that matters when comparing fuel prices or car specifications from different countries.

Quick reference: common conversions

The conversions people look up most often, as calculated by this tool. Values marked “exact” are fixed by definition; the others are rounded.

Common use cases

• Students and teachers check science, maths and engineering homework.
• Cooks and bakers convert recipes between cups, millilitres, ounces and grams.
• Travellers and online shoppers understand sizes, speeds and temperatures from other countries.
• Property buyers and farmers convert marla, kanal, acres and square feet.
• IT professionals convert storage and file sizes between decimal and binary units.

Accuracy, limitations and privacy

Conversions use exact international definitions where they exist and commonly accepted values for traditional units, shown in the unit labels. Results are calculated with double-precision arithmetic and displayed with up to six decimal places, or more for values below one; very large and very small numbers are shown in scientific notation. Month and year in the time category are averages: 30.44 days and 365.25 days.

Traditional units such as the marla and maund have varied between regions and periods, so check the definition that applies to you. Everything runs locally in your browser.

• Cooking cups and spoons use US definitions; UK and metric cups differ slightly.
• Mach depends on air temperature and altitude; the converter uses the sea-level value of 343 m/s.
• Currency is not a unit conversion and is not included; use the currency calculator with your own rate.

Tips and best practices

• For property, confirm whether your document uses a 272.25 or 225 sq ft marla before converting.
• For internet speeds, remember that Mbps means megabits; divide by 8 to get megabytes per second.
• Use the table view to compare several units at once instead of converting one by one.
• Round only the final answer when using conversions in further calculations.
• For detailed explanations of one category, open its dedicated converter page.

Related tools and next steps

Each category also has its own page with more detail: the Length Converter, Weight Converter, Temperature Converter, Area Converter and Data Storage Converter. For property in Pakistan, use the marla and kanal converter, and for gold the gold calculator.