⚡ Used by engineers, students & scientists worldwide
The fastest, most accurate
unit converter online
Convert between metric, imperial, and specialized units instantly. Built for speed, accuracy, and zero friction — no sign-up, no limits, 100% free.
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Convert in three simple steps
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1
Choose a category
Pick from 15 categories covering every measurement you need — from length and weight to fuel economy and data storage.
2
Type your value
Enter a number in either field. Select your units from the dropdowns. Conversion happens instantly as you type.
3
Copy or use
Read the result, copy it to your clipboard, or swap units to convert the other way. That's it.
All converter categories
15 categories, hundreds of units, infinite conversions
Length
Centimeters to Inches, Inches to Centimeters, Feet to Meters, Meters to Feet
90 units · 19+ tools
Weight & Mass
Kilograms to Pounds, Pounds to Kilograms, Grams to Ounces, Ounces to Grams
75 units · 15+ tools
Temperature
Celsius to Fahrenheit, Fahrenheit to Celsius, Celsius to Kelvin, Kelvin to Celsius
6 units · 6+ tools
Area
Square Meters to Square Feet, Square Feet to Square Meters, Acres to Square Meters, Hectares to Acres
15 units · 8+ tools
Volume
Liters to US Gallons, US Gallons to Liters, Milliliters to Fluid Ounces, Cups to Milliliters
21 units · 10+ tools
Speed
KPH to MPH, MPH to KPH, Meters per Second to KPH, Knots to KPH
9 units · 6+ tools
Time
Minutes to Seconds, Hours to Minutes, Days to Hours, Weeks to Days
14 units · 6+ tools
Data Storage
Megabytes to Kilobytes, Gigabytes to Megabytes, Terabytes to Gigabytes, Mebibytes to Kibibytes
19 units · 6+ tools
Energy
Joules to Calories, Kilocalories to Kilojoules, Kilowatt-Hours to Megajoules, BTU to Kilojoules
16 units · 5+ tools
Power
Kilowatts to Horsepower, Horsepower to Kilowatts, Watts to BTU per Hour, Megawatts to Kilowatts
11 units · 4+ tools
Pressure
Bar to PSI, PSI to Bar, Atmospheres to Pascals, Pascals to Kilopascals
15 units · 5+ tools
Frequency
Hertz to Kilohertz, Megahertz to Hertz, Gigahertz to Megahertz
8 units · 3+ tools
Fuel Consumption
Convert between MPG (US & UK), km/L, L/100km, and more.
6 units · 0+ tools
Angle
Degrees to Radians, Radians to Degrees, Gradians to Degrees
9 units · 3+ tools
Force
Newtons to Pound-Force, Pound-Force to Newtons, Kilogram-Force to Newtons, Dynes to Newtons
12 units · 4+ tools
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