Everyday calculator
How do I convert units?
Convert common length, weight, and temperature units in seconds. Each section below provides the exact formula so you can verify the math.
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Switch conversion direction for each unit pair.
Length formula
Inches to centimeters: cm = in x 2.54. Centimeters to inches: in = cm / 2.54.
Weight formula
Pounds to kilograms: kg = lb / 2.2046. Kilograms to pounds: lb = kg x 2.2046.
Temperature formula
Fahrenheit to Celsius: C = (F - 32) x 5/9. Celsius to Fahrenheit: F = (C x 9/5) + 32.
What this means
- - 10 cm = 3.94 in
- - 150 lb = 68.0 kg
- - 25C = 77F
- - 0C = 32F
What to do next
Use the conversions for travel, fitness goals, or recipes that list different units.
FAQ
How many centimeters are in an inch?
One inch equals exactly 2.54 centimeters.
How do I convert Celsius to Fahrenheit?
Use F = (C x 9/5) + 32. To convert back, C = (F - 32) x 5/9.
Why do conversions matter?
Conversions help you compare measurements across countries, recipes, fitness goals, and technical specs.