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79 tools. 1,830 unit options. One place to make sense of your measurements.
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Everyday
The units you reach for every day.
Length
Convert distances and dimensions between metric, imperial, astronomical and historical units.
92 unit optionsWeight and Mass
Convert mass between kilograms, pounds, ounces, grams and regional weight units.
69 unit optionsVolume
Convert liquid measures and three-dimensional space. US and Imperial measures are listed separately.
76 unit optionsTemperature
Convert temperature readings between Celsius, Fahrenheit, kelvin and other scales.
6 unit optionsArea
Convert the size of a surface between square units, acres, hectares and regional land measures.
39 unit optionsPressure
Convert pressure readings for engineering, weather and fluid systems.
52 unit optionsEnergy
Convert energy quantities between joules, watt-hours, calories and other energy units.
54 unit optionsVolume - Dry
Convert dry-capacity measures, including bushels and pecks. Dry measures differ from liquid measures.
15 unit optionsCurrency
Convert currencies using reference exchange rates. Check the source and retrieval time before using a result.
153 unit optionsCase
Change capitalization, clean up spacing and prepare text for headings, sentences or URLs.
Text transformationsPower
Convert the rate of energy transfer between watts, horsepower and other power units.
76 unit optionsForce
Convert forces between newtons, pound-force, kilogram-force and related units.
33 unit optionsTime
Convert fixed durations between seconds, minutes, hours and longer time units.
33 unit optionsSpeed
Convert distance per unit of time, including kilometers per hour, miles per hour and knots.
32 unit optionsAngle
Convert angular measurements between degrees, radians, revolutions and survey units.
14 unit optionsFuel Consumption
Convert fuel economy and consumption. US and Imperial miles per gallon use different gallon sizes.
37 unit optionsNumbers
Convert whole numbers between bases 2 to 36, including binary, decimal, octal and hexadecimal.
39 unit optionsData Storage
Convert data capacity between bits, bytes, decimal units and binary units.
41 unit optionsEngineering
Mechanics, motion and material properties.
Velocity - Angular
Convert rotational speed between angular units per second, minute or hour.
12 unit optionsAcceleration
Convert the rate of change of velocity, including meters per second squared and standard gravity.
19 unit optionsAcceleration - Angular
Convert the rate of change of rotational speed between angular acceleration units.
5 unit optionsDensity
Convert mass per unit volume. Density is a material property and can change with temperature.
42 unit optionsSpecific Volume
Convert volume per unit mass. Specific volume is the reciprocal of density.
8 unit optionsMoment of Inertia
Convert rotational inertia units. Moment of inertia depends on mass distribution about an axis.
14 unit optionsMoment of Force
Convert force multiplied by perpendicular distance from a pivot.
12 unit optionsTorque
Convert turning moment between newton-meters, pound-force feet and other torque units.
17 unit optionsHeat
Thermal properties and energy transfer.
Fuel Efficiency - Mass
Convert energy per unit mass and its reciprocal, mass per unit energy.
15 unit optionsFuel Efficiency - Volume
Convert energy per unit volume and volumetric fuel consumption per unit energy.
15 unit optionsTemperature Interval
Convert a change in temperature. Temperature differences use scale factors without temperature offsets.
6 unit optionsThermal Expansion
Convert coefficients of thermal expansion expressed per unit of temperature change.
5 unit optionsThermal Resistance
Convert the resistance to heat flow between temperature difference per unit power.
5 unit optionsThermal Conductivity
Convert the ability of a material to conduct heat across a temperature gradient.
13 unit optionsSpecific Heat Capacity
Convert the energy needed per unit mass for a unit change in temperature.
20 unit optionsHeat Density
Convert energy per unit volume for thermal calculations.
5 unit optionsHeat Flux Density
Convert the rate of heat transfer per unit surface area.
26 unit optionsHeat Transfer Coefficient
Convert heat transfer per unit area per unit temperature difference.
11 unit optionsFluids
Flow, concentration and fluid behavior.
Flow
Convert volumetric flow, the volume of fluid passing a point per unit time.
58 unit optionsFlow - Mass
Convert mass flow, the mass passing a point per unit time.
31 unit optionsFlow - Molar
Convert the flow of amount of substance, measured in moles per unit time.
26 unit optionsMass Flux Density
Convert mass flow per unit cross-sectional area.
7 unit optionsConcentration - Molar
Convert amount-of-substance concentration in moles per unit volume.
12 unit optionsConcentration - Solution
Convert mass concentration, the mass of solute per unit volume of solution.
11 unit optionsViscosity - Dynamic
Convert dynamic viscosity, which describes a fluid’s resistance to shear.
29 unit optionsViscosity - Kinematic
Convert kinematic viscosity, the ratio of dynamic viscosity to density.
24 unit optionsSurface Tension
Convert force per unit length at a fluid interface.
8 unit optionsPermeability
Convert permeability measures used to describe fluid transport through porous materials.
5 unit optionsLight
Illumination, images and electromagnetic waves.
Luminance
Convert luminous intensity per unit projected area of a source or surface.
19 unit optionsLuminous Intensity
Convert photometric intensity measures for a light source in a given direction.
10 unit optionsIllumination
Convert illuminance, the luminous flux incident on a surface per unit area.
12 unit optionsDigital Image Resolution
Convert pixel or dot density between per-inch and per-millimeter measures.
4 unit optionsFrequency Wavelength
Convert frequency units and the corresponding electromagnetic wavelength in a vacuum.
35 unit optionsElectricity
Electrical quantities, from charge to inductance.
Charge
Convert quantities of electric charge between coulombs, ampere-hours and related units.
17 unit optionsLinear Charge Density
Convert electric charge per unit length.
6 unit optionsSurface Charge Density
Convert electric charge per unit surface area.
6 unit optionsVolume Charge Density
Convert electric charge per unit volume.
6 unit optionsCurrent
Convert electric current between amperes and other current units.
10 unit optionsLinear Current Density
Convert electric current per unit width or length.
8 unit optionsSurface Current Density
Convert current per unit area through a conductor.
6 unit optionsElectric Field Strength
Convert electric field strength expressed as force per charge or voltage per distance.
13 unit optionsElectric Potential
Convert voltage and electric potential difference.
6 unit optionsElectric Resistance
Convert resistance values between ohms and related units.
10 unit optionsElectric Resistivity
Convert material resistivity, accounting for conductor geometry.
8 unit optionsElectric Conductance
Convert electrical conductance, the reciprocal of electrical resistance.
12 unit optionsElectric Conductivity
Convert material conductivity, the reciprocal of resistivity.
8 unit optionsElectrostatic Capacitance
Convert capacitance, electric charge stored per unit potential difference.
22 unit optionsInductance
Convert inductance between henries and related electromagnetic units.
22 unit optionsMagnetism
Fields, flux and magnetic circuits.
Magnetomotive Force
Convert the magnetic driving force in a magnetic circuit.
5 unit optionsMagnetic Field Strength
Convert magnetic field strength H, including amperes per meter and oersteds.
4 unit optionsMagnetic Flux
Convert magnetic flux through a surface.
13 unit optionsMagnetic Flux Density
Convert magnetic flux density B, including teslas and gauss.
11 unit optionsRadiology
Activity, exposure and radiation dose.
Radiation
Convert radiation dose rates within the same physical quantity.
22 unit optionsRadiation-Activity
Convert radioactive decay activity, including becquerels and curies.
16 unit optionsRadiation-Exposure
Convert radiation exposure, expressed as charge produced per unit mass of air.
7 unit optionsRadiation-Absorbed Dose
Convert radiation dose units. Absorbed and equivalent dose are kept distinct.
23 unit optionsOther
Digital data, type, sound and more.
Prefixes
Convert SI decimal prefixes, including quetta, ronna, ronto and quecto.
25 unit optionsData Transfer
Convert data transfer rates between bits, bytes and interface-rate conventions.
107 unit optionsSound
Convert logarithmic level units: bels, decibels and nepers.
3 unit optionsTypography
Convert typographic measurements between points, picas, pixels and physical lengths.
15 unit optionsVolume - Lumber
Convert timber volumes, including board feet, cubic units and cords.
17 unit options