All conversions
Every unit converter, in one place.
36 measurement converters, 8 cooking and baking calculators and live currency rates. Search for a unit or browse by category.
Common
The everyday essentials
Engineering
Angular velocity, acceleration, density, torque and moment of inertia.
Angular Velocity
Rotational speed: RPM, radians per second, degrees per second and revolutions per second.
Acceleration
Linear acceleration in SI and imperial units, plus g-force and car-style km/h per second.
Density
Mass per volume for liquids, solids and gases: kg/m³, g/cm³, lb/ft³, lb/gal and more.
Torque
Rotational force: newton meters, pound-feet, kilogram-force meters and more.
Moment of Inertia
Mass moment of inertia (rotational inertia) in SI and imperial units.
Fluids & Heat
Flow rate, viscosity, surface tension, permeability, thermal conductivity and specific heat.
Flow Rate
Volumetric flow for pumps, pipes and HVAC: L/min, m³/h, gpm, cfm, barrels per day and more.
Dynamic Viscosity
Dynamic (absolute) viscosity: pascal-seconds, poise, centipoise and imperial units.
Kinematic Viscosity
Kinematic viscosity: stokes, centistokes, mm²/s and imperial units.
Surface Tension
Surface and interfacial tension: N/m, mN/m, dyn/cm and imperial units.
Permeability
Water-vapor permeability of materials, per unit thickness.
Thermal Conductivity
How well a material conducts heat: W/(m·K), BTU/(h·ft·°F), BTU·in/(h·ft²·°F) and calorie units (International Table BTU and calorie).
Specific Heat
Specific heat capacity: J/(kg·K), kJ/(kg·K), J/(g·°C), cal/(g·°C) and BTU/(lb·°F).
Light & Electricity
Luminance, illumination, charge, current, resistance, capacitance and more.
Luminance
How bright a surface or screen looks: nits (cd/m²), foot-lamberts, stilbs and lamberts.
Luminous Intensity
Light sent out in one direction: candela, millicandela (LED specs) and candlepower.
Illumination
Light falling on a surface: lux, foot-candles, phots and lumens per area.
Electric Charge
Coulombs, battery capacity (mAh, Ah), the faraday and CGS units.
Electric Current
Amperes, milliamperes, microamperes and CGS units of electric current.
Electric Resistance
Ohms, kilohms and megohms for resistors and circuits, plus CGS units.
Electric Conductance
The inverse of resistance: siemens, mho and CGS units.
Capacitance
Farads, microfarads, nanofarads and picofarads for capacitors, plus CGS units.
Inductance
Henries, millihenries and microhenries for coils and inductors, plus CGS units.
Radiology & Specialty
Radiation dose, data storage and transfer, angle and fuel consumption.
Absorbed Dose
Radiation energy absorbed per kilogram: gray, rad and their multiples.
Equivalent Dose
Radiation dose adjusted for its health effect: sievert, millisievert, rem and millirem.
Radioactivity
How fast a radioactive source decays: becquerel, curie and their multiples, plus disintegrations per minute.
Radiation Exposure
Ionization caused in air by X-rays and gamma rays: roentgen and coulomb per kilogram.
Data Storage
File and disk sizes in bits and bytes.
Data Transfer
Internet and network speeds.
Angle
Degrees, radians, gradians, arcminutes, arcseconds, turns and mils for maths, maps, optics and navigation.
Fuel Consumption
Car fuel economy both ways: L/100 km, km/L, and US or UK miles per gallon.
Cooking & Baking Calculators
Cakes, oven temperatures, recipe scaling and turkey timings.
Cake Calculator
How many cakes to bake for your guests.
Milk Weight Calculator
What a cup, quart, gallon or litre of milk weighs.
Oven Temperature Conversion Chart
°F, °C, fan oven and gas mark, side by side.
Oven to Air Fryer Conversion
Oven time and temperature, made air fryer ready.
Recipe Scale Calculator
Halve, double or resize any recipe.
Turkey Cooking Time Calculator
Roasting time by weight, stuffed and not stuffed.
Turkey Size Calculator
How big a turkey to buy for your guests.
Turkey Thawing Time Calculator
Fridge or cold-water thawing.
Currency
Live Exchange rates for 160+ world currencies, updated once a day.