Unit Converter
Convert length, weight, temperature, volume, area and speed instantly.
TL;DR — Unit Converter: A unit converter translates a value from one unit of measurement into another within the same physical quantity — for example, kilometres to miles, kilograms to pounds, Celsius to Fahrenheit. Cal44 supports six categories: length, weight, temperature, volume, area and speed, with common metric, imperial and US units.
What is the Unit Converter?
A unit converter translates a value from one unit of measurement into another within the same physical quantity — for example, kilometres to miles, kilograms to pounds, Celsius to Fahrenheit. Cal44 supports six categories: length, weight, temperature, volume, area and speed, with common metric, imperial and US units.
How to use the Unit Converter
- Choose the category (length, weight, temperature, volume, area or speed).
- Enter the value and select the source unit.
- Select the target unit.
- Read the converted value.
Formula
Length: 1 in = 2.54 cm · 1 ft = 0.3048 m · 1 mi = 1.609344 km Weight: 1 kg = 2.20462 lb · 1 oz = 28.3495 g Temperature: °F = °C × 9/5 + 32 · K = °C + 273.15 Volume: 1 gal (US) = 3.78541 L · 1 fl oz (US) = 29.5735 mL
Speed: 1 mph = 1.609344 km/h · 1 knot = 1.852 km/h. Area: 1 acre = 4046.86 m² · 1 hectare = 10,000 m².
Worked example
5 miles to kilometres = 5 × 1.609344 = 8.0467 km. 100 °F to °C = (100 − 32) × 5 ÷ 9 = 37.78 °C. 50 kg to lb = 50 × 2.20462 = 110.23 lb.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
°F = °C × 9 ÷ 5 + 32. 20 °C is 68 °F. Going the other way: °C = (°F − 32) × 5 ÷ 9.
How many millilitres in a US cup?
1 US cup = 236.588 mL. 1 metric cup = 250 mL. 1 imperial cup (UK) = 284.131 mL.
What's the difference between US and imperial gallons?
1 US gallon = 3.78541 L. 1 imperial (UK) gallon = 4.54609 L. The imperial gallon is about 20% larger.
How do I convert square metres to square feet?
1 m² = 10.7639 ft². Multiply m² by 10.7639.
Is the unit converter accurate?
Cal44 uses internationally standardised conversion factors. Results are accurate to the displayed precision; for engineering or scientific work, verify against the original SI definitions.