⇄ Conversion Calculator
Metric and imperial units collide constantly — recipes, DIY projects, travel and science all mix grams with ounces and Celsius with Fahrenheit. Pick a category, enter a value, and convert between every common unit in that family.
Length and weight convert through exact defined factors (an inch is exactly 2.54 cm). Temperature uses the standard offset formulas between Celsius, Fahrenheit and Kelvin.
Unit Converter
How to use this calculator
Pick a measurement category, enter a value, and convert between units in that family using the From unit and To unit dropdowns, with a Swap button to flip the direction.
- Choose a Category from the dropdown: Length, Weight or Temperature.
- Type the Value you want to convert.
- Set the From unit and the To unit to the two units you are converting between.
- Press the Convert button to see the result, or the Swap units button to reverse the direction.
Frequently asked questions
What does the Conversion Calculator compute?
It converts a value between units within one category: Length (such as inches, centimeters, miles, kilometers), Weight (such as pounds, kilograms, ounces, grams) and Temperature (Celsius, Fahrenheit, Kelvin). You pick the category first, then the From unit and To unit.
What method does it use for the conversions?
Length and weight convert through exact defined factors, for instance an inch is exactly 2.54 centimeters and a pound is exactly 0.45359237 kilograms. Temperature uses the standard offset formulas between the three scales, so 0 degrees Celsius becomes exactly 32 degrees Fahrenheit.
Can you give a worked example?
Choose Length, enter Value 5, set From unit to miles and To unit to kilometers, then press Convert. The result is about 8.047 kilometers. Press Swap units and converting 5 kilometers back gives about 3.107 miles.
Are the results exact, and any tips?
Results follow the exact defined conversion factors, so any rounding you see comes only from display precision, not from sloppy math. When precision matters, like medication doses or engineering clearances, double-check the unit pair before converting, since mixing up similar units is the most common mistake.