Percentage Calculator
Calculate a percentage of a number, percentage increases and decreases, percentage change, or an original value before a discount.
Local processingUnit Converter
About this tool
Convert values between common metric and imperial units for length, area, mass, volume, temperature, and speed. You can also convert digital storage units using decimal or binary definitions. Results update as you enter a value.
Features
- Seven categories of units
- Convert in either direction
- Celsius, Fahrenheit, and Kelvin
- Decimal and binary digital storage units
- Common conversions such as miles to kilometres and pounds to kilograms
How to use
- Choose a category: Select length, mass, temperature, storage, or another category.
- Enter a value: Enter a number and choose the original and target units.
- View the result: Copy the converted value.
Examples
- Convert cups to millilitres for a recipe
- Convert feet to metres
- Compare GB and GiB storage values
- Convert miles per hour to kilometres per hour
Limitations
- The tool uses standard conversion factors and is not a certified measuring instrument
- Very long decimal results may be rounded because of browser number handling
- The entered values and calculations are processed directly in your browser and are not sent to a server.
FAQ
- What is the difference between GB and GiB?
- GB uses groups of 1,000 bytes, while GiB uses groups of 1,024 bytes. Use the definition shown by the device or service you are comparing.
- How is temperature converted?
- Formulas translate between °C, °F, and K with standard offsets and scaling.
- Can I convert chains to furlongs?
- Obscure imperial units may not be listed—use length metres as an intermediate if needed.