Converter categories
Choose a quantity. Each category has a converter for all of its units, a units table and short explanations.
Common
- LengthDistances and lengths, from nanometers to nautical miles.13 units
- Weight & MassMass and weight in metric, US customary and imperial units.11 units
- VolumeLiquid and cubic volumes, including US customary and imperial measures.18 units
- TemperatureTemperature scales: kelvin, Celsius, Fahrenheit and Rankine.4 units
- AreaSurface area in square metric and US customary units, hectares and acres.10 units
- PressurePressure and stress: pascal, bar, atmosphere, psi, mmHg and more.13 units
- EnergyEnergy and work: joule, kilowatt-hour, calorie, BTU and electronvolt.11 units
- PowerPower in watts, horsepower, BTU per hour and related units.9 units
- ForceForce in newtons, pounds-force, kilograms-force, dynes and related units.14 units
- TimeTime intervals from nanoseconds to years.9 units
- SpeedSpeed and velocity: m/s, km/h, mph, knots and more.8 units
- AnglePlane angles in degrees, radians, gradians, arcminutes and turns.7 units
- Fuel ConsumptionFuel economy in mpg (US and UK), L/100 km, km/L and related units.7 units
- Data StorageBits and bytes with decimal (kB, MB, GB) and binary (KiB, MiB, GiB) prefixes.19 units
- Data TransferNetwork and transfer speeds: Mbps, Gbps, MB/s and more.12 units
- Dry VolumeDry measures such as bushels, pecks and dry quarts, with liters and cubic meters.10 units
Engineering
- AccelerationAcceleration in m/s², ft/s², g (standard gravity) and gal.5 units
- Angular AccelerationAngular acceleration in rad/s², deg/s² and revolution-based units.5 units
- Angular VelocityRotational speed in rpm, rad/s, degrees per second and more.7 units
- DensityDensity in kg/m³, g/cm³, lb/ft³, lb/gal and other units.9 units
- Specific VolumeVolume per mass: m³/kg, L/kg, ft³/lb and more.5 units
- Moment of InertiaRotational inertia in kg·m², lb·ft², oz·in² and more.7 units
- TorqueTorque and moment of force: N·m, lbf·ft, lbf·in, kgf·m and more.10 units
Heat
- Temperature IntervalTemperature differences (not readings) in kelvins, °C, °F and °R.4 units
- Thermal ExpansionCoefficients of thermal expansion: 1/K, 1/°F, ppm/K and ppm/°F.5 units
- Thermal ResistanceThermal resistance of a part or component: K/W and °F·h/BTU.3 units
- Thermal Insulance (R-value)Insulation R-values: US R-value, RSI (m²·K/W), clo and tog.4 units
- Thermal ConductivityThermal conductivity in W/(m·K), BTU/(h·ft·°F) and related units.6 units
- Specific Heat CapacitySpecific heat in J/(kg·K), kJ/(kg·K), BTU/(lb·°F) and cal/(g·°C).4 units
- Heat DensityEnergy per area: J/m², kWh/m², BTU/ft² and langley.6 units
- Heat Flux DensityHeat flux and irradiance: W/m², BTU/(h·ft²) and more.6 units
- Heat Transfer CoefficientHeat transfer coefficients and U-values: W/(m²·K) and BTU/(h·ft²·°F).5 units
- Fuel Energy per MassHeating value and specific energy by mass: MJ/kg, BTU/lb, kWh/kg and more.7 units
- Fuel Energy per VolumeHeating value and energy density by volume: MJ/m³, MJ/L, BTU/ft³ and more.8 units
Fluids
- Flow RateVolumetric flow: GPM, L/min, m³/h, CFM and more.15 units
- Mass FlowMass flow rate: kg/s, kg/h, lb/h, t/h and more.8 units
- Molar FlowMolar flow rate: mol/s, kmol/h, lbmol/h and more.7 units
- Mass Flux DensityMass flow per area: kg/(m²·s), lb/(ft²·h) and more.5 units
- Molar ConcentrationMolarity: mol/L (M), mmol/L, µmol/L, nmol/L and mol/m³.6 units
- Solution ConcentrationMass concentration: g/L, mg/L, mg/dL, % w/v and more.7 units
- Dynamic ViscosityAbsolute viscosity: Pa·s, cP, poise, lbf·s/ft² and more.7 units
- Kinematic ViscosityKinematic viscosity: cSt, mm²/s, stokes, ft²/s and more.6 units
- Surface TensionSurface tension: N/m, mN/m, dyn/cm and lbf/in.6 units
- Permeability (Porous Media)Permeability of rock, soil and filters: darcy, millidarcy and m².4 units
Light
- LuminanceBrightness of surfaces and screens: nits (cd/m²), foot-lamberts and more.8 units
- Luminous IntensityLuminous intensity in candelas, millicandelas and kilocandelas.4 units
- IlluminationIlluminance (light falling on a surface): lux, foot-candles and phot.5 units
- Digital Image ResolutionPrint and screen resolution: dpi, ppi, dots per cm and dots per mm.6 units
- Frequency & WavelengthConvert frequency (Hz to THz) to electromagnetic wavelength and back.11 units
Electricity
- Electric ChargeElectric charge: coulombs, mAh, Ah, elementary charges and CGS units.10 units
- Linear Charge DensityCharge per length: C/m, C/cm, C/in and more.7 units
- Surface Charge DensityCharge per area: C/m², µC/cm² and more.5 units
- Volume Charge DensityCharge per volume: C/m³, C/cm³ and more.5 units
- Electric CurrentElectric current: amperes, mA, µA, kA and CGS units.7 units
- Linear Current DensityCurrent per length: A/m, A/cm, A/in and more.7 units
- Electric Field StrengthElectric field strength and dielectric strength: V/m, kV/mm, V/mil and more.9 units
- Electric Potential (Voltage)Voltage: volts, millivolts, kilovolts and CGS units.7 units
- Electric ResistanceResistance: ohms, kΩ, MΩ, mΩ and CGS units.8 units
- Electric ResistivityResistivity of materials: Ω·m, Ω·cm, µΩ·cm and Ω·cmil/ft.5 units
- Electric ConductanceConductance: siemens (mho), mS, µS and CGS units.6 units
- Electric ConductivityConductivity of materials and water: S/m, mS/cm, µS/cm.5 units
- CapacitanceCapacitance: farads, µF, nF, pF and CGS units.7 units
- InductanceInductance: henries, mH, µH, nH and CGS units.6 units
- Power Level (dBm, dBW)Signal and radio power as a level in decibels: dBm and dBW, with watts and milliwatts.6 units
Magnetism
Radiology
- Radiation Dose (Equivalent)Equivalent and effective dose: sieverts, mSv, µSv, rem and mrem.5 units
- RadioactivityActivity of radioactive sources: becquerels, curies and related units.11 units
- Radiation ExposureExposure to X-rays and gamma rays: roentgen and C/kg.5 units
- Absorbed DoseAbsorbed radiation dose: gray, mGy, cGy and rad.6 units
Other
- TypographyType and layout units: points, picas, CSS pixels, inches and millimeters.10 units
- Lumber VolumeTimber and firewood volume: board feet, MBF, cords and steres.7 units
- SI PrefixesSI prefixes from quecto (10⁻³⁰) to quetta (10³⁰): kilo, mega, giga, milli, micro, nano and more.25 units
- Sound Pressure Level (dB SPL)Sound pressure in pascals and as a level in decibels (dB SPL in air, dB re 1 µPa in water).5 units
- Sound Intensity Level (dB IL)Sound intensity in W/m² and as a level in decibels (dB IL).4 units