Unit Converter
Convert length, weight, and temperature. Free, no signup.
How It Works
Select a category, enter a value, and choose the source and target units. The conversion updates automatically as you type. Supports metric and imperial units.
Supported Units
Length: millimeters, centimeters, meters, kilometers, inches, feet, yards, miles. Weight: milligrams, grams, kilograms, ounces, pounds. Temperature: Celsius, Fahrenheit, Kelvin.
Common Conversions
| Conversion | Factor | Example |
|---|---|---|
| Inches to cm | x 2.54 | 12 in = 30.48 cm |
| cm to inches | ÷ 2.54 | 100 cm = 39.370079 in |
| Miles to km | x 1.609344 | 10 mi = 16.09344 km |
| km to miles | ÷ 1.609344 | 5 km = 3.106856 mi |
| kg to pounds | x 2.204623 | 10 kg = 22.046226 lb |
| Pounds to kg | ÷ 2.204623 | 150 lb = 68.0388 kg |
| Celsius to Fahrenheit | x 9/5 + 32 | 37 °C = 98.6 °F |
Metric and Imperial
The converter bridges the two main measurement systems used around the world. Metric units (millimeters, meters, kilometers, grams, kilograms, Celsius) are standard in most countries, while imperial units (inches, feet, yards, miles, ounces, pounds, Fahrenheit) are common in the United States. Switch between them freely for recipes, DIY projects, travel, fitness, science homework, and international shopping.
Frequently Asked Questions
How do I convert cm to inches or kg to lbs?
Choose the category (Length or Weight), type your value, and set the From and To units, for example Centimeters to Inches or Kilograms to Pounds. The result updates as you type, so 30 cm shows 11.811024 inches and 5 kg shows 11.023113 pounds.
Which units does the converter support?
Length covers millimeters, centimeters, meters, kilometers, inches, feet, yards and miles. Weight covers milligrams, grams, kilograms, ounces and pounds. Temperature covers Celsius, Fahrenheit and Kelvin.
How do I convert Celsius to Fahrenheit?
Select the Temperature category, set From to Celsius and To to Fahrenheit, then enter the value. The tool applies the standard formula (C x 9/5 + 32), so 100 Celsius converts to 212 Fahrenheit and 0 Celsius to 32 Fahrenheit.
How precise are the results?
Conversions are calculated with exact factors, such as 1 inch equalling 25.4 millimeters and 1 pound equalling 453.592 grams, then rounded to six decimal places. Trailing zeros are trimmed so the result stays easy to read.
Is the converter free and private?
Yes. It is completely free with no signup, and every conversion runs locally in your browser. Nothing you type is sent to a server, and the tool keeps working even without an internet connection once loaded.