Conversion Calculator
Convert a value between supported units of length, area, volume, mass, temperature, speed or time, with swap and copy controls.
Calculator arithmetic runs locally in your browser and does not require an API.
The interactive calculator loads here when JavaScript is enabled.
How to use Conversion Calculator
Choose a category and the from/to units. Changing category selects units from that category. Swap reverses the unit selectors while retaining the input number; Clear removes the value and Reset restores the example.
Formula and method
For proportional units: result = value × source factor / destination factor. Temperature uses offsets: °F = °C × 9/5 + 32 and K = °C + 273.15. Inputs below absolute zero are rejected.
Understanding the results
Area factors are squared length relationships and volume factors are cubed relationships. US liquid and Imperial gallons are separate choices. Mass units represent mass, not force; time days are fixed 24-hour durations without calendar, timezone or daylight-saving rules. Currency conversion is not included.
Worked example
10 international feet × 0.3048 = 3.048 meters. Temperature is different: 20°C converts to 68°F using 20 × 9/5 + 32, not a single multiplication factor.
Displayed results are rounded; use the appropriate measurement precision for your task.
References
Frequently asked questions
Are US and Imperial gallons the same?
No. Choose the explicitly labeled gallon unit; they have different volumes.
Does this convert currency or fetch exchange rates?
No. Currency and live rates are outside this tool’s supported categories.
Can it convert months into hours?
No. Variable-length calendar months are not fixed time units in this converter.