Unit Converter
Convert between 8 categories of units instantly. Real-time conversion as you type.
Quick Reference
How to Use the Unit Converter
- Select a category — Choose from 8 categories: Length, Weight, Temperature, Volume, Area, Speed, Time, or Data. Each category has its own set of units.
- Choose your units — Select the source unit and target unit from the dropdown menus. Enter a number in the input field.
- Read the result — The converted value appears instantly as you type. The formula box below shows the exact conversion factor being used.
How Unit Conversion Works
Unit conversion uses multiplication by a conversion factor. Each unit is defined relative to a base unit for its category. For example, in the Length category, the base unit is the meter. 1 kilometer = 1000 meters, 1 foot = 0.3048 meters. To convert kilometers to feet, the converter multiplies by 1000 (km to meters) then divides by 0.3048 (meters to feet).
Temperature is the exception — it uses formulas rather than simple multiplication because the scales have different zero points. Celsius to Fahrenheit uses F = (C x 9/5) + 32, while Kelvin starts at absolute zero (-273.15 degrees Celsius).
Common Use Cases
- International travel — Convert between metric and imperial for distances, weights, and temperatures when traveling between countries.
- Cooking and baking — Convert between cups, tablespoons, milliliters, and liters when following recipes from different countries.
- Science and engineering — Convert between units for calculations, lab work, or technical documentation.
- Data storage — Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes for storage planning and network calculations.
Did You Know?
The metric system (SI) is used by every country in the world except the United States, Myanmar, and Liberia. Even in the US, science, medicine, and the military use metric. The conversion factor approach used by this converter is the same method taught in physics and engineering courses worldwide.
Most Common Conversions
| Conversion | Exact Value | Category |
|---|---|---|
| 1 cm | = 0.3937 inches | Length |
| 1 inch | = 2.54 cm | Length |
| 1 meter | = 3.2808 feet | Length |
| 1 foot | = 0.3048 meters | Length |
| 1 km | = 0.6214 miles | Length |
| 1 mile | = 1.6093 km | Length |
| 1 kg | = 2.2046 lbs | Weight |
| 1 pound | = 453.592 g | Weight |
| 1 ounce | = 28.3495 g | Weight |
| 1 liter | = 0.2642 gallons (US) | Volume |
| 1 gallon (US) | = 3.7854 liters | Volume |
| 1 cup (US) | = 236.588 ml | Volume |
| 1 tablespoon | = 14.787 ml | Volume |
| 1 sq foot | = 0.0929 sq meters | Area |
| 1 acre | = 4,046.86 sq meters | Area |
| 1 hectare | = 2.4711 acres | Area |
| 1 byte | = 8 bits | Data |
| 1 GB | = 1,024 MB | Data |
| 1 mph | = 1.6093 km/h | Speed |
| 1 knot | = 1.852 km/h | Speed |
Metric to Imperial Quick Reference
| Metric | Imperial | Conversion |
|---|---|---|
| 1 millimeter | 0.0394 inches | mm × 0.03937 = in |
| 1 centimeter | 0.3937 inches | cm × 0.3937 = in |
| 1 meter | 3.2808 feet | m × 3.2808 = ft |
| 1 kilometer | 0.6214 miles | km × 0.6214 = mi |
| 1 gram | 0.0353 ounces | g × 0.03527 = oz |
| 1 kilogram | 2.2046 pounds | kg × 2.2046 = lb |
| 1 liter | 0.2642 gallons | L × 0.2642 = gal |
| 1 milliliter | 0.0338 fluid oz | ml × 0.0338 = fl oz |
| 1 sq meter | 10.7639 sq feet | m² × 10.7639 = ft² |
| 1 sq kilometer | 0.3861 sq miles | km² × 0.3861 = mi² |
Temperature Comparison
| Description | Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|---|
| Absolute Zero | −273.15 | −459.67 | 0 |
| Water Freezes | 0 | 32 | 273.15 |
| Room Temperature | 20–22 | 68–72 | 293–295 |
| Human Body | 37 | 98.6 | 310.15 |
| Water Boils | 100 | 212 | 373.15 |
| Oven (Baking) | 180–230 | 350–450 | 453–503 |
| Surface of the Sun | 5,505 | 9,941 | 5,778 |
Frequently Asked Questions
How do I convert units online?
Select a category (length, weight, temperature, etc.), choose your source and target units from the dropdowns, then enter a number. The conversion happens instantly as you type. No button click needed.
What unit categories are supported?
This converter supports 8 categories: Length, Weight, Temperature, Volume, Area, Speed, Time, and Data. Each category includes multiple units like meters, feet, kilograms, pounds, Celsius, Fahrenheit, and more.
How accurate are the conversions?
All conversions use standard, internationally recognized conversion factors. Results are displayed with up to 10 significant digits for maximum accuracy. For scientific or engineering work, the precision is more than sufficient.
Can I convert between metric and imperial units?
Yes. The converter supports both metric (meters, kilograms, liters) and imperial (feet, pounds, gallons) systems. Simply select the metric unit in one field and the imperial unit in the other.
What is the formula for temperature conversion?
The tool shows the exact formula used for each conversion. For example, Celsius to Fahrenheit: F = (C x 9/5) + 32. Celsius to Kelvin: K = C + 273.15. The formula box updates automatically when you change units.
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