Unit Converter
Convert between common length, weight, and temperature units. Enter a value and get the result instantly.
About This Tool
Unit conversion is one of the most common needs in daily life, study, and work. Seeing inches and pounds while shopping, grams and ounces while cooking, or understanding the difference between Celsius and Fahrenheit when traveling abroad — all of these call for quick and accurate conversion.
This tool includes three major categories of common units:
- Length: millimeters (mm), centimeters (cm), meters (m), kilometers (km), inches (in), feet (ft), miles (mi)
- Weight: milligrams (mg), grams (g), kilograms (kg), metric tons (t), pounds (lb), ounces (oz)
- Temperature: Celsius (°C), Fahrenheit (°F), Kelvin (K)
Length and weight units are converted linearly using international standard conversion factors; temperature conversion uses the corresponding formulas (Celsius to Fahrenheit: °F = °C × 9/5 + 32; Celsius to Kelvin: K = °C + 273.15).
How to Use
- Select a conversion category: length, weight, or temperature.
- Choose the source and target units from the "From" and "To" dropdowns.
- Enter a value and the result appears instantly; you can also click the "Swap Units" button to quickly reverse the conversion direction.
Frequently Asked Questions
How many centimeters is 1 inch?
1 inch = 2.54 centimeters, an exact value defined by international agreement. Common screen sizes (such as a 6.7-inch phone) express the diagonal length in inches.
How many kilograms is 1 pound?
1 pound (lb) = 0.45359237 kilograms, approximately 0.454 kg. Scales and fitness equipment abroad often use pounds as the unit.
How do you convert between Celsius and Fahrenheit?
Fahrenheit = Celsius × 9 ÷ 5 + 32; Celsius = (Fahrenheit − 32) × 5 ÷ 9. For example, 25°C = 77°F, and normal body temperature 37°C ≈ 98.6°F.
What is the Kelvin temperature unit?
Kelvin (K) is the unit of thermodynamic temperature in the International System of Units (SI), where 0 K is absolute zero. Kelvin and Celsius share the same scale intervals, with K = °C + 273.15.
Are there any errors in the conversion results?
This tool calculates with precise international conversion factors, and length and weight conversions are accurate at commonly used precision. Displayed results keep a reasonable number of significant digits; tiny rounding differences do not affect everyday use.