About Unit Converter
Free unit converter for length, weight, volume, temperature, speed, and area. Convert between metric, imperial, and SI units instantly with accurate results. No sign-up needed.
How to use
- Select the measurement category: length, weight/mass, volume, temperature, area, speed, pressure, energy, data storage, or time. Each category contains all common units used in everyday life, science, engineering, and cooking.
- Choose the source unit and enter the value you want to convert. The converter accepts any numeric value including decimals and negative numbers (for temperature). For example, enter 72 in the Fahrenheit field to convert to Celsius.
- View the conversion results across all available units in that category simultaneously. When you convert 1 kilometre, you instantly see the equivalent in miles, metres, feet, inches, yards, centimetres, and millimetres — no need to run separate conversions.
- Use the swap button to quickly reverse the conversion direction. If you converted kilometres to miles, one click swaps the fields so you can convert miles to kilometres without re-entering values.
- Access commonly needed conversions quickly: kilometres to miles for driving distances, kilograms to pounds for weight, litres to gallons for fuel, Celsius to Fahrenheit for weather, and square metres to square feet for real estate.
- Reference the conversion factors displayed alongside results to understand the mathematical relationship between units. Knowing that 1 mile = 1.609 km or 1 inch = 2.54 cm helps you do rough mental conversions when a calculator is not available.
Frequently asked questions
How do I convert kilometres to miles?
Multiply kilometres by 0.6214 to get miles. 100 km = 62.14 miles. Divide miles by 0.6214 (or multiply by 1.609) to get kilometres. 60 miles = 96.56 km. Quick mental math: multiply km by 0.6 for a rough estimate (100 km is about 60 miles). For driving in Canada where speed limits are in km/h: 100 km/h = 62 mph, 120 km/h = 75 mph. For distance: Toronto to Montreal is about 540 km or 335 miles. The converter handles these calculations instantly with full precision.
How do I convert Celsius to Fahrenheit?
Multiply Celsius by 9/5 (or 1.8) and add 32. For example: 20C = (20 x 1.8) + 32 = 68F. 37C (body temperature) = 98.6F. 0C (freezing) = 32F. 100C (boiling) = 212F. To convert Fahrenheit to Celsius: subtract 32, then multiply by 5/9. 72F = (72 - 32) x 5/9 = 22.2C. Quick mental estimate: double the Celsius, subtract 10%, add 32. For 25C: 50 - 5 + 32 = 77F (actual: 77F). This shortcut works well for everyday temperatures.
How do I convert kilograms to pounds?
Multiply kilograms by 2.2046 to get pounds. 70 kg = 154.3 lbs. Divide pounds by 2.2046 to get kilograms. 150 lbs = 68.0 kg. Quick mental math: double the kg and add 10% (70 kg x 2 = 140, + 14 = 154 lbs). For cooking: 1 kg = 2.2 lbs, 500g = 1.1 lbs, 250g = 0.55 lbs. Canadian food packaging shows both metric and imperial measurements, but recipes from different countries may use only one system. This converter handles all weight conversions including ounces, grams, and stone.
How do I convert litres to gallons?
Canada uses Imperial gallons while the US uses US gallons, and they are different sizes. 1 litre = 0.2642 US gallons = 0.2200 Imperial gallons. 1 US gallon = 3.785 litres. 1 Imperial gallon = 4.546 litres. This distinction matters for fuel economy: a Canadian vehicle rated at 10 L/100km uses the same fuel as a US vehicle rated at 23.5 mpg (US) or 28.2 mpg (Imperial). Always verify which gallon system is being used, especially when reading fuel economy ratings from different countries.
How do I convert square feet to square metres?
Divide square feet by 10.764 to get square metres. 1,000 sq ft = 92.9 sq m. Multiply square metres by 10.764 to get square feet. 100 sq m = 1,076.4 sq ft. Quick mental math: divide sq ft by 10 for a rough estimate (1,500 sq ft is about 150 sq m, actual: 139 sq m). Canadian real estate uses both units: houses are typically listed in square feet, condos in square metres. Knowing the conversion helps compare properties listed in different units. For measuring actual rooms or spaces to get the square footage you are converting, use the
Area Calculator to compute the area of rectangles, circles, triangles, and irregular shapes first.
What is the metric system vs imperial system?
The metric system (SI) uses base-10 units: metres, kilograms, litres, Celsius. The imperial system uses historically derived units: feet, pounds, gallons, Fahrenheit. Canada officially adopted metric in 1970 but still uses imperial for many everyday purposes: height and weight (feet/pounds), cooking (cups/teaspoons), construction (inches/feet), and some temperature references. The US primarily uses imperial. Most of the world uses metric. Being comfortable converting between both systems is a practical necessity in Canada, where road signs are in kilometres but construction materials are sold in feet and inches.
How do I convert between data storage units?
Data storage uses base-2 and base-10 prefixes that are commonly confused. In computing: 1 KB (kilobyte) = 1,024 bytes, 1 MB = 1,024 KB = 1,048,576 bytes, 1 GB = 1,024 MB, 1 TB = 1,024 GB. Hard drive manufacturers use base-10: 1 TB = 1,000,000,000,000 bytes. This is why a 1 TB drive shows as about 931 GB in your operating system. Mobile data plans use base-10 (1 GB = 1,000 MB). Internet speeds are measured in megabits (Mb), not megabytes (MB): 100 Mbps internet downloads at roughly 12.5 MB per second. This converter handles both binary and decimal prefixes.
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