Unit Conversion Calculator
Convert instantly between length, mass, temperature, and speed units
Converted Value
How to Use This Calculator
- Select the measurement type (Length, Mass, Temperature, or Speed) from the Category dropdown.
- Enter the numeric quantity you want to convert in the Value to Convert box.
- Choose the starting unit in the From Unit list.
- Select the desired output unit in the To Unit list.
- Click “Convert Units” to calculate the precise equivalent value.
The Formula Used
Unit conversions rely on standardized multiplier ratios or algebraic linear equations:
Standard Units: Output = Input × (Base Ratio From / Base Ratio To)
Fahrenheit to Celsius: °C = (°F – 32) × 5/9
Celsius to Fahrenheit: °F = (°C × 9/5) + 32
Fahrenheit to Celsius: °C = (°F – 32) × 5/9
Celsius to Fahrenheit: °F = (°C × 9/5) + 32
Frequently Asked Questions (FAQ)
What is the difference between Metric and Imperial systems?
The Metric system uses base-10 multiples (meters, grams, liters), whereas the Imperial system uses arbitrary historical ratios (feet, inches, pounds, ounces).
How many kilometers are in one mile?
One mile is equal to approximately 1.60934 kilometers.
Why doesn’t temperature conversion use a simple multiplier?
Because Celsius and Fahrenheit have different zero reference points (0°C vs 32°F), requiring an offset addition/subtraction in addition to a scaling factor.
How many pounds are in one kilogram?
One kilogram is equal to approximately 2.20462 pounds.
How do I convert knots to kilometers per hour?
One knot equals 1 nautical mile per hour, which corresponds to exactly 1.852 kilometers per hour.