About the Unit Converter
Convert compatible measurements of length, mass, area and volume using fixed reference factors.
Formula or method
First convert the starting unit to a common base unit, then convert the base value into the target unit. Each category uses a consistent set of factors.
Worked example
One inch equals exactly 2.54 centimetres. One avoirdupois pound equals exactly 0.45359237 kilograms. One US liquid gallon equals 3.785411784 litres.
How to use the tool
Start with the example values above, then replace each input with your own figures. The results update immediately. Review the units, denominators, and assumptions before using any number in an important decision.
Assumptions and limitations
Select the correct quantity type. US liquid gallons differ from Imperial gallons; mass is not force, and squared or cubed units must not be treated as linear units.
Frequently asked questions
Why is converting back sometimes slightly different?
The stored factors retain precision, but rounded on-screen results can lose decimal places. Use the full result for chained calculations.
Privacy and support
Your inputs are processed locally in your browser. ToolMosaic does not upload or store the values you enter in this tool. Our tools are free, and we appreciate your support.