Unit converters
Open Unit converters on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.
Page guide
Find the right tool and get straight to your task.
No account needed.Celsius to fahrenheit
Convert temperatures from Celsius to Fahrenheit.
Cm to inches
Convert centimeters to inches for your next measurement.
Kg to lb
Turn kilograms into pounds without doing the conversion yourself.
Mm to inches
Convert millimeters to inches.
Lbs to kg
Convert pounds to kilograms.
Inches to cm
Convert inches to centimeters.
Fahrenheit to celsius
Convert temperatures from Fahrenheit to Celsius.
Km to miles
Convert kilometers to miles.
Meters to feet
Convert meters to feet.
Liters to gallons
Convert liters to US liquid gallons.
Grams to ounces
Convert grams to standard weight ounces.
Temperature
Convert between Celsius, Fahrenheit, and Kelvin.
Mph to kmh
Convert miles per hour to kilometers per hour.
Weight
Convert between kilograms, pounds, ounces, and other mass units.
Power
Convert between watts, kilowatts, megawatts, and horsepower.
Length
Convert between meters, feet, inches, and other length units.
Speed
Convert between meters per second, kilometers per hour, miles per hour, and knots.
Area
Convert between square meters, square feet, acres, and other area units.
Energy
Convert between joules, calories, watt-hours, and kilowatt-hours.
Volume
Convert between liters, milliliters, and US or Imperial volume units.
Pressure
Convert between pascals, kilopascals, bar, atmospheres, and psi.
Time units
Convert between milliseconds, seconds, minutes, hours, days, and weeks.
Angle
Convert between degrees, radians, and turns.
Data storage
Convert between bits, bytes, decimal storage units, and binary storage units.
About unit converters
This online unit converter collection handles the measurements people look up every day. Quick converters cover Celsius to fahrenheit, Cm to inches, Kg to lb, Mm to inches, Km to miles and Liters to gallons. For broader jobs, the Length, Weight, Temperature, Volume, Speed, Area, Pressure, Energy and Data storage converters let you switch between many units in one place, which helps with recipes, travel, schoolwork and shopping.
Use a single purpose converter when you repeat the same conversion often, and a general converter when you need to compare several units at once. Watch for US and UK differences in gallons and other volume units before you rely on a result.
Popular unit converters
Common questions
How do I convert Celsius to Fahrenheit by hand?
Multiply the Celsius value by 9, divide by 5, then add 32. For example, 20 degrees Celsius equals 68 degrees Fahrenheit. The Celsius to fahrenheit converter does this instantly and shows the result with sensible rounding.
Are US and UK gallons the same?
No. A US gallon is about 3.785 liters, while a UK imperial gallon is about 4.546 liters. Check which gallon your recipe, fuel figure or product label uses, then choose the matching unit in the Liters to gallons converter.
Do the converters need an internet connection after loading?
The popular converters, including Celsius to fahrenheit, Cm to inches and Kg to lb, run in your browser once the page has loaded. Your values are calculated on your device and are not sent to our server.