Unit Converter
Convert between common units of measurement
What it does: Convert between common units of measurement. This free online tool works entirely in your browser with no installation required.
How to use:
- Select a measurement category like length, weight, or temperature from the dropdown.
- Enter a value and choose the source and target units from the available options.
- The converted value appears instantly; use the swap button to reverse the direction.
Privacy: All processing happens in your browser. No data sent to servers.
Best for: Anyone who needs quick Unit Converter without installing software.
Unit Conversion Tips
Unit conversion is essential in science, engineering, cooking, travel, and everyday life. Understanding the relationships between units can help you work more effectively across different measurement systems. This tool supports length, weight, temperature, area, volume, speed, digital storage, and time conversions.
Key Conversion Facts
- Length — 1 inch = 2.54 centimeters exactly. 1 mile = 1.609 kilometers. The meter is the SI base unit of length.
- Weight — 1 kilogram = 2.205 pounds. 1 ounce = 28.35 grams. The kilogram is the only SI base unit defined by a physical artifact (until recently).
- Temperature — Water freezes at 0°C / 32°F and boils at 100°C / 212°F. Kelvin (K) is the SI unit where 0 K is absolute zero (-273.15°C).
- Digital Storage — 1 kilobyte (KB) = 1,024 bytes. A common confusion: hard drive manufacturers use decimal (1 KB = 1,000 bytes) while operating systems use binary (1 KB = 1,024 bytes).
- Time — 1 day = 86,400 seconds. A year is approximately 365.25 days, which is why we have leap years every four years.
Common Conversion Mistakes to Avoid
- Forgetting to convert both value and units when dealing with derived units like speed (km/h to mph requires converting both distance and time).
- Confusing US gallons (3.785 L) with Imperial gallons (4.546 L) used in the UK and Canada.
- Mixing up metric prefixes: kilo- (1000), centi- (1/100), milli- (1/1000), micro- (1/1,000,000).
- Using the wrong conversion factor for temperature — unlike other units, temperature conversion requires a formula, not just multiplication.