612+ instant conversions

Convert any unit. Instantly.

Free, fast, and accurate unit converter with conversion tables, formulas, real-world examples, and FAQs for every pair.

Length

Convert between meters, feet, inches, kilometers, miles, and more

Weight & Mass

Convert between kilograms, pounds, ounces, grams, stones, and tons

Temperature

Convert between Celsius, Fahrenheit, and Kelvin

Area

Convert between square meters, acres, hectares, square feet, and more

Volume

Convert between liters, gallons, cups, fluid ounces, and more

Speed

Convert between km/h, mph, m/s, knots, and feet per second

Time

Convert between seconds, minutes, hours, days, weeks, months, and years

Digital Storage

Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and more

Pressure

Convert between pascals, bar, PSI, atmospheres, and mmHg

Energy

Convert between joules, calories, kilowatt-hours, BTU, and more

Frequency

Convert between hertz, kilohertz, megahertz, and gigahertz

Fuel Economy

Convert between MPG, km/L, and L/100km

Angle

Convert between degrees, radians, and gradians

Popular Conversions

Meters to Feetm → ft Kilograms to Poundskg → lb Celsius to Fahrenheit°C → °F Kilometers to Mileskm → mi Liters to US GallonsL → gal km/h to mphkm/h → mph Inches to Centimetersin → cm Pounds to Kilogramslb → kg Fahrenheit to Celsius°F → °C

About QuantiConvert

QuantiConvert covers 13 measurement categories and over 612 unique conversion pairs. Every page includes a formula, conversion table, real-world use cases, worked examples, and FAQs — designed to be genuinely useful, not just a calculator.

We support the metric system (SI), imperial, US customary, and specialized units for science, engineering, computing, and everyday life. All conversion factors use internationally recognized definitions.