Unit Converter
Convert length, weight, temperature, volume, speed and more.
Runs entirely in your browser. Nothing you type is sent to a server.
1 mm = 0.1 cm
All unit conversion pages
Every pair has its own page with the formula, worked examples and a quick-reference table.
- Kilometers → Miles
- Miles → Kilometers
- Centimeters → Inches
- Inches → Centimeters
- Meters → Feet
- Feet → Meters
- Millimeters → Inches
- Inches → Millimeters
- Yards → Meters
- Meters → Yards
- Kilograms → Pounds
- Pounds → Kilograms
- Grams → Ounces
- Ounces → Grams
- Kilograms → Stones
- Stones → Kilograms
- Celsius → Fahrenheit
- Fahrenheit → Celsius
- Celsius → Kelvin
- Kelvin → Celsius
- Liters → Gallons (US)
- Gallons (US) → Liters
- Milliliters → Fluid ounces (US)
- Fluid ounces (US) → Milliliters
- Cups (US) → Milliliters
- Milliliters → Cups (US)
- Miles per hour → Kilometers per hour
- Kilometers per hour → Miles per hour
- Megabytes → Gigabytes
- Gigabytes → Megabytes
- Kilobytes → Megabytes
About the Unit Converter
Convert between metric and imperial units across length, weight, temperature, area, volume, speed, time and data storage. Pick a category, type a value, and see the converted result instantly. All math runs in your browser using verified conversion factors.
How to use the Unit Converter
- 1Choose a category (Length, Weight, Temperature, and so on).
- 2Pick the unit you're converting from and the unit you want to convert to.
- 3Type the value you want to convert — the result updates as you type.
- 4Tap the swap button to flip the direction of the conversion.
Why use our Unit Converter
8 unit categories
Length, weight, temperature, area, volume, speed, time and data storage.
Verified factors
Uses the same constants as the international standards (1 in = 25.4 mm, 1 lb = 0.453592 kg).
Live results
No 'convert' button — the answer updates the moment you type.
Browser-only
All conversions happen locally. Nothing you type is uploaded or logged.
Frequently asked questions
Which gallon, cup and pint does this use?+
The volume units default to US customary (US gallon = 3.78541 L, US cup = 236.588 mL, US pint = 473.176 mL). For imperial UK units, multiply by the relevant factor manually.
Is 1 GB equal to 1024 MB or 1000 MB?+
This converter uses the binary convention (1 GB = 1024 MB, technically a GiB), which matches what most operating systems report. Drive manufacturers and ISPs often use the decimal convention (1 GB = 1000 MB).
How accurate are the temperature conversions?+
Temperature conversions use the exact formulas (°F = °C × 9/5 + 32, K = °C + 273.15) so they're mathematically precise to the displayed digits.
Can I link to a pre-set conversion like km to miles?+
Yes. SwiftTooly has dedicated pages for the most common pairs — for example, /units/km-to-miles, /units/kg-to-lbs and /units/celsius-to-fahrenheit.