Unit Converter

One converter for everyday and study use

This unit converter handles the conversions people search for most, all in one place. Choose a category, enter a number and see the answer instantly, plus a table showing the same value in every other unit of that category.

Categories and examples:

• Length: millimeter, centimeter, meter, kilometer, inch, foot, yard, mile, nautical mile
• Weight: milligram, gram, kilogram, metric ton, ounce, pound, stone, tola, maund
• Temperature: Celsius, Fahrenheit, Kelvin
• Area: square meter, square foot, square yard, acre, hectare, square mile, marla, kanal
• Volume: milliliter, liter, cubic meter, teaspoon, tablespoon, cup, fluid ounce, US and UK gallons
• Speed: m/s, km/h, mph, knots
• Time: seconds up to years
• Data: bits and bytes up to terabytes, in both decimal (KB, MB, GB) and binary (KiB, MiB, GiB)
• Pressure: pascal, kPa, bar, PSI, atmosphere, mmHg
• Energy: joule, calorie, kilocalorie, watt-hour, kWh, BTU

How to use the unit converter

1. Pick a category tab such as Length or Area.
2. Enter a value in the From box and choose its unit.
3. Choose the unit you want in the To box. You can also type in the To box to convert backwards.
4. Use the swap button to flip the units.

Common conversions

About marla and kanal

Marla and kanal are land units used in Pakistan and northern India. The size of a marla is not the same everywhere. This converter uses 1 marla = 225 square feet (so 1 kanal = 4,500 ft²), which is common in many housing societies. Some areas and old revenue records use 272.25 square feet per marla. Always confirm with the local land authority or your property documents.

The values for standard units follow the international SI system, explained by the US National Institute of Standards and Technology.

Temperature is different

Temperature scales do not start at the same zero, so they cannot be converted by multiplying alone. The formulas are °F = °C × 9/5 + 32 and K = °C + 273.15. The converter handles this for you.

For calculations with your converted values, open the Scientific Calculator, or work out changes with the Percentage Calculator. See all calculators.

Quick reference: everyday conversions

Some of these, like the inch and the foot, are exact by international definition. Others are rounded to a sensible number of digits.

Land measurement in Pakistan

Land in Pakistan is often measured in marla, kanal and acre, but the size of a marla is not the same everywhere:

• A marla of 225 square feet is common in many official land records and housing societies.
• A marla of 272.25 square feet is used in some areas and older revenue records.
• Some developers use 250 square feet in their own plans.

1 kanal = 20 marla, and 1 acre = 8 kanal = 160 marla. This converter uses 1 marla = 225 square feet. Before buying or selling property, always confirm which marla size the seller, the housing society and the land record use, because the difference on a 10-marla plot can be several hundred square feet.

Traditional weights: tola and maund

Gold in South Asia is still priced per tola. One tola is defined as 11.6638 grams. A maund (mann) is used for crops and is about 37.32 kilograms (40 seers). These units are handy when comparing local prices with international prices quoted in grams, ounces or kilograms.

Metric vs. imperial in daily life

Most of the world uses the metric system (metres, kilograms, litres), while the USA still uses imperial units for many everyday things. The UK uses a mix, for example miles on road signs and kilograms in shops. When reading recipes, product specifications or fitness plans from another country, a quick conversion avoids costly mistakes. The official definitions of SI units are published by the International Bureau of Weights and Measures (BIPM).

Data sizes: KB, MB and GB

Computers use two systems. In the decimal system, 1 KB is 1,000 bytes; in the binary system, 1 KiB is 1,024 bytes. That is why a "500 GB" hard drive shows about 465 GB in Windows. This matters when you compress images or PDFs; see the Image Compressor and Compress PDF tools for real file sizes.

For calculations with converted values, use the Scientific Calculator or the Percentage Calculator.

Converting temperatures, speed and fuel

A few conversions are not simple multiplications:

• Temperature: F = C x 9/5 + 32, and C = (F - 32) x 5/9. Water freezes at 0 C (32 F) and boils at 100 C (212 F) at sea level.
• Speed: 1 km/h = 0.621 mph, and 1 m/s = 3.6 km/h.
• Fuel economy: kilometres per litre and miles per gallon depend on which gallon is used. Litres per 100 km is the reverse of km per litre, so a car using 8 L/100 km does 12.5 km per litre.

When reading imported product specifications, check units carefully, especially for power ratings, cable sizes and screen sizes, which are often given in inches.

Last updated: October 25, 2026