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80 families, grouped by what you’re measuring. Each tool explains its units, assumptions, and supported directions.
No converters match. Try a quantity such as pressure or length.
Common
Length
From a small measurement to a long distance. Move between metric and imperial units.
8 units · 56 directions
Weight and Mass
Compare mass in kilograms, pounds, grams, and ounces. Pounds and ounces use avoirdupois definitions.
4 units · 12 directions
Volume
Convert liters, milliliters, cubic meters, and clearly labeled US and imperial measures for liquids and capacity.
7 units · 42 directions
Temperature
Convert everyday temperatures between Celsius, Fahrenheit, and Kelvin, including their different zero points.
3 units · 6 directions
Area
Convert surface areas in metric and international customary units.
7 units · 42 directions
Pressure
Convert pressure differences or absolute pressures between consistent units.
6 units · 30 directions
Energy
Convert work, heat, and stored energy using joules as the base.
7 units · 42 directions
Volume Dry
Convert dry capacities using the US Winchester bushel and metric volumes.
6 units · 30 directions
Currency
Convert currencies with a rate, effective date, and source you enter explicitly.
6 currencies · 30 directions
Case
Transform text into lowercase, uppercase, title case, sentence case, or code identifier styles.
7 styles · 42 directions
Power
Convert rates of energy transfer, including watts and explicitly defined horsepower.
6 units · 30 directions
Force
Convert forces between newtons, dynes, pound-force, and kilogram-force.
5 units · 20 directions
Time
Convert fixed elapsed durations from nanoseconds to weeks.
8 units · 56 directions
Speed
Convert linear speeds in metric, customary, and nautical units.
5 units · 20 directions
Angle
Convert plane angles in radians, degrees, turns, and survey grads.
6 units · 30 directions
Fuel Consumption
Convert vehicle fuel use and fuel economy with reciprocal formulas.
5 units · 20 directions
Numbers
Convert signed integers between binary, octal, decimal, and hexadecimal.
4 bases · 12 directions
Data Storage
Convert bit and byte counts with explicit decimal and binary prefixes.
8 units · 56 directions
Engineering
Velocity Angular
Convert angular speeds between radians, degrees, and revolutions per unit time.
4 units · 12 directions
Acceleration
Convert linear acceleration using meters per second squared.
4 units · 12 directions
Acceleration Angular
Convert the rate of change of angular velocity.
5 units · 20 directions
Density
Convert mass per unit volume in SI and customary units.
5 units · 20 directions
Specific Volume
Convert volume per unit mass for thermodynamic and engineering data.
4 units · 12 directions
Moment of Inertia
Convert mass moments of inertia used in rotational dynamics.
4 units · 12 directions
Moment of Force
Convert force moments about a point or axis for statics.
5 units · 20 directions
Torque
Convert twisting moments for shafts, fasteners, and drives.
5 units · 20 directions
Heat
Fuel Efficiency Mass
Convert fuel energy per mass and reciprocal specific fuel consumption.
6 units · 30 directions
Fuel Efficiency Volume
Convert energy per fuel volume and reciprocal volume per energy.
6 units · 30 directions
Temperature Interval
Convert temperature changes without adding temperature-scale offsets.
4 units · 12 directions
Thermal Expansion
Convert coefficients expressed per temperature interval.
4 units · 12 directions
Thermal Resistance
Convert whole-object thermal resistance in temperature difference per power.
4 units · 12 directions
Thermal Conductivity
Convert material conductivity in heat flow per distance and temperature difference.
4 units · 12 directions
Specific Heat Capacity
Convert heat capacity per unit mass and temperature interval.
4 units · 12 directions
Heat Density
Convert heat energy per area, also called areal energy density.
4 units · 12 directions
Heat Flux Density
Convert heat-transfer power per unit area.
4 units · 12 directions
Heat Transfer Coefficient
Convert surface heat-transfer coefficients between SI and customary units.
4 units · 12 directions
Fluids
Flow
Convert volumetric flow rates for liquids and gases.
6 units · 30 directions
Flow Mass
Convert mass transported per unit time.
4 units · 12 directions
Flow Molar
Convert amount-of-substance flow rates in moles per time.
4 units · 12 directions
Mass Flux Density
Convert mass flow per unit cross-sectional area.
4 units · 12 directions
Concentration Molar
Convert amount-of-substance concentration in moles per solution volume.
4 units · 12 directions
Concentration Solution
Convert mass concentration in a volume of solution.
5 units · 20 directions
Viscosity Dynamic
Convert dynamic viscosity in pascal seconds and poise.
5 units · 20 directions
Viscosity Kinematic
Convert kinematic viscosity using square meters per second.
5 units · 20 directions
Surface Tension
Convert interfacial force per unit length.
4 units · 12 directions
Permeability
Convert water-vapor permeance, the mass transmission rate per area and pressure difference.
4 units · 12 directions
Light
Luminance
Convert visible-light luminance in candela per projected area.
5 units · 20 directions
Luminous Intensity
Convert luminous intensity in candela and SI multiples.
4 units · 12 directions
Illumination
Convert illuminance on a surface between lux and foot-candles.
4 units · 12 directions
Digital Image Resolution
Convert linear pixel density between pixels per inch and per metric distance.
4 units · 12 directions
Frequency Wavelength
Convert electromagnetic frequency and wavelength with an explicit refractive index.
7 units · 42 directions
Electricity
Charge
Convert electric charge in coulombs and ampere-hours.
5 units · 20 directions
Linear Charge Density
Convert electric charge distributed per unit length.
4 units · 12 directions
Surface Charge Density
Convert electric charge per unit surface area.
4 units · 12 directions
Volume Charge Density
Convert electric charge per unit volume.
4 units · 12 directions
Current
Convert electric current in amperes and metric multiples.
4 units · 12 directions
Linear Current Density
Convert sheet current per unit transverse width.
4 units · 12 directions
Surface Current Density
Convert current per cross-sectional area in amperes per square meter.
4 units · 12 directions
Electric Field Strength
Convert electric field strength as potential gradient or force per charge.
4 units · 12 directions
Electric Potential
Convert electric potential differences in volts and SI multiples.
4 units · 12 directions
Electric Resistance
Convert electrical resistance in ohms and SI multiples.
4 units · 12 directions
Electric Resistivity
Convert material electrical resistivity in ohm-length units.
4 units · 12 directions
Electric Conductance
Convert electric conductance in siemens and SI multiples.
4 units · 12 directions
Electric Conductivity
Convert material electrical conductivity in siemens per length.
4 units · 12 directions
Electrostatic Capacitance
Convert capacitance in farads and common submultiples.
5 units · 20 directions
Inductance
Convert inductance in henries and SI submultiples.
4 units · 12 directions
Magnetism
Magnetomotive Force
Convert magnetomotive force in ampere-turns and gilberts.
4 units · 12 directions
Magnetic Field Strength
Convert magnetic H-field strength in amperes per meter and oersteds.
4 units · 12 directions
Magnetic Flux
Convert magnetic flux in webers and maxwells.
4 units · 12 directions
Magnetic Flux Density
Convert magnetic B-field flux density in teslas and gauss.
4 units · 12 directions
Radiology
Radiation
Convert absorbed-dose rates, expressed as energy deposited per mass per time.
5 units · 20 directions
Radiation Activity
Convert radioactive decay activity between becquerels and curies.
5 units · 20 directions
Radiation Exposure
Convert photon exposure in air using charge per mass.
4 units · 12 directions
Radiation Absorbed Dose
Convert absorbed ionizing-radiation energy per mass in grays and rads.
4 units · 12 directions
Radiation Equivalent Dose
Convert already-weighted equivalent dose in sieverts and rem.
4 units · 12 directions
Other
Prefixes
Convert decimal SI prefixes from quecto to quetta.
25 units · 600 directions
Data Transfer
Convert data rates with explicit bit, byte, decimal, and binary units.
7 units · 42 directions
Sound
Convert RMS sound pressure and logarithmic pressure levels with an explicit reference.
5 units · 20 directions
Typography
Convert absolute CSS lengths and desktop-publishing points.
6 units · 30 directions
Volume Lumber
Convert solid wood volume between board feet, cubic feet, and metric volume.
5 units · 20 directions