Free tool · runs in your browser
Unit Converter
Pick a category, enter a value and read the result. The converter updates as you type and uses exact standard factors where they exist.
The factors behind the results
Some conversions are exact by definition: one inch is 25.4 mm, one pound is 0.45359237 kg, and one US liquid gallon is 3.785411784 L. Others, such as the acre, are exact in square metres by convention.
This tool uses the US liquid gallon for volume. The UK imperial gallon is larger, about 4.54609 L, so a recipe or fuel figure quoted in imperial gallons will not match.
Decimal and binary storage units
Drive manufacturers use decimal units: 1 KB = 1,000 bytes, 1 GB = 1,000,000,000 bytes. Operating systems often report binary units: 1 KiB = 1,024 bytes, 1 GiB = 1,073,741,824 bytes. That is why a 1 TB drive shows around 931 GiB in a file manager.
Both numbers are correct; they use different units. Choose the matching unit in the converter before comparing values.
Temperature is affine, not proportional
Celsius, Fahrenheit and Kelvin do not share a zero point, so temperature cannot be converted with a single ratio. The formulas are F = C × 9/5 + 32 and K = C + 273.15. The converter handles the offset for you; do not apply the ratio alone.
Frequently asked questions
Is this the US or the UK gallon?
US liquid gallon (3.785411784 L). If you need imperial gallons, multiply the US result by about 1.20095 or use the litre value and convert manually.
Why does my 1 TB drive show 931 GB?
The drive is sold in decimal terabytes (1,000,000,000,000 bytes), while the operating system reports binary GiB (1,073,741,824 bytes per GiB). The capacity is the same; the unit is different.
How precise are the results?
The factors are standard and exact where defined. Displayed results are rounded to a practical number of digits, so do not treat the last digit as a measurement tolerance.
Does it work offline?
Yes, once the page is cached. No conversion is sent to a server.
Can I convert negative temperatures?
Yes. Celsius and Fahrenheit handle negatives, and Kelvin values below zero are mathematically representable but physically impossible.