Physics Unit Converters for Science and Engineering

Convert units used in mechanics, electricity, magnetism, heat, light, and other areas of physics. These calculators help students check homework, researchers compare measurements, and engineers work with specifications in different unit systems. Use the Force, Energy, and Pressure calculators for common quantities, or choose specialized tools such as the Viscosity Converter, Magnetic Flux Density, Heat Transfer, and Electrical Resistivity calculators. Whether you are working through a physics problem or reviewing technical data, find the quantity you need in the list below.

Viscosity Converter

Convert between dynamic viscosity units (Pa·s, mPa·s, Poise, cP) and kinematic viscosity units (m²/s, mm²/s, Stokes, cSt). Enter a value, pick a unit, and add the density to switch between the two families.

Henry’s Law

Enter a Henry’s law constant and select From unit and To unit to see the calculator’s output. Check the definition of the constant before using a value converted between different forms.

Luminous Intensity

Convert luminous intensity between candela, millicandela, spherical candela, Hefner candle, and Violle. Enter a value and select the units to convert from and to.

Electric Field

Convert electric field strength between V/m, kV/m, N/C, V/cm, and statV/cm. Enter a value, then choose the From unit and To unit.

Electrical Resistivity

Convert electrical resistivity between Ω·m, Ω·cm, μΩ·cm, Ω·mm²/m, and statΩ·cm. Enter a resistivity value, then select the units to convert from and to.

Linear Acceleration

Convert linear acceleration between m/s², cm/s², ft/s², in/s², Gal, and standard gravity (g). Enter a value, then choose the units to convert from and to.

Radiation Exposure

Convert radiation exposure between C/kg, mC/kg, μC/kg, and roentgens (R). Enter an exposure value, then select the units to convert from and to.

Radioactivity

Convert radioactive activity between Bq, kBq, MBq, GBq, Ci, mCi, and µCi. Enter an activity value, then choose the starting and target units.

Sound

Convert sound pressure levels between dB SPL, Pa, and µPa, or sound intensity between dB IL and W/m². Enter a Sound value and choose the From unit and To unit.

Calorific Value

Convert a calorific value between MJ/kg, kcal/kg, BTU/lb, and kJ/kg by entering a value and choosing the source and target units. Note: the calculator currently reverses conversions between different units.

Energy

Convert an energy value between joules, calories, kilowatt-hours, BTUs, and other units. Enter a value, then choose the From unit and To unit.

Force

Convert a force between newtons, kilonewtons, dynes, pound-force, kilogram-force, ounce-force, gram-force, and kips. Enter a Force value and choose the From unit and To unit.

Mass

Convert a mass between kilograms, grams, pounds, ounces, tons, and other units. Enter a Mass value, then choose the From unit and To unit.

Mass Flow Rate

Convert a mass flow rate between kg/s, g/s, kg/min, kg/h, lb/s, lb/min, lb/h, and metric tons per hour. Enter a value and choose the units to convert from and to.

Radiation Absorbed Dose

Convert an absorbed radiation dose between grays, milligrays, micrograys, rads, and millirads. Enter a value and choose the units to convert from and to.

Angular Velocity

Convert angular velocity between RPM, rad/s, deg/s, rad/min and more. Enter a value in any unit and instantly get the equivalent in all other common angular speed units.

Conductance Units

Convert electrical conductance between siemens, millisiemens, microsiemens, and nanosiemens. Enter a value, then choose the From unit and To unit.

Density Converter

Convert density values between kg/m³, g/cm³, g/mL, lb/ft³, lb/in³ and more. Enter a value, pick a unit, and get the equivalent density in all common units at once.

Electric Charge

Convert electric charge between coulombs, millicoulombs, microcoulombs, nanocoulombs, and ampere-hours. Enter a value, then select the From unit and To unit.

Electric Current

Convert electric field strength between V/m, kV/m, N/C, V/cm, and statV/cm. Enter an electric field value, then select the units to convert from and to.

Electrical Capacitance

Convert capacitance between farads, millifarads, microfarads, nanofarads, picofarads, statfarads, and abfarads. Enter a value, then select the From unit and To unit.

Heat Flux Density

Convert heat flux density between W/m², kW/m², cal/s·cm², BTU/h·ft², and BTU/s·ft². Enter a value, then choose the starting and target units.

Heat Transfer

Convert a heat transfer rate between watts, kilowatts, megawatts, calories per second, and BTU-based units. Enter a rate, then select the From unit and To unit.

Inductance

Convert inductance between henries, millihenries, microhenries, nanohenries, abhenries, and stathenries. Enter a value, then choose the units to convert from and to.

Light Illumination

Convert light levels between lux, foot-candles, phot, and lumen-based units. Enter an Illumination value, then choose the From unit and To unit.

Light Luminance

Convert luminance between cd/m², nits, foot-lamberts, stilbs, and other units. Enter a luminance value, then choose the From unit and To unit.

Pressure

Convert a pressure value between Pa, kPa, MPa, bar, atm, mmHg, cmHg, inHg, psi, and torr. Enter the value and select the starting and target units.

Specific Heat

Convert specific heat capacity between J/g·°C, J/kg·K, kJ/kg·K, cal/g·°C, and BTU/lb·°F. Enter a value and choose the From unit and To unit.

Surface Tension

Convert surface tension between N/m, dyne/cm, mN/m, and kg/s². Enter a value, then choose the units to convert from and to.

Thermal Expansion

Convert a coefficient of linear thermal expansion between 1/°C, 1/K, µm/m·°C, and in/in·°F. Enter a value and select the From unit and To unit. Note: the current calculator gives incorrect results for some unit pairs.

Torque

Convert torque between N·m, kN·m, N·cm, kgf·m, lbf·ft, and lbf·in. Enter a torque value, then choose the units to convert from and to.

Acceleration Units

Convert an acceleration value between m/s², ft/s², standard gravity (g), and Gal. Enter the value, then choose the From unit and To unit.

Electric Static Potential

Convert electric potential between volts, kilovolts, millivolts, microvolts, and statvolts. Enter a nonnegative value, then choose the units to convert from and to.

Frequency

Convert a frequency between Hz, kHz, MHz, GHz, THz, rpm, rad/s, and deg/s. Enter a Frequency value, then choose the From unit and To unit.

Linear Current Density

Convert linear current density between A/m, kA/m, A/cm, mA/mm, and µA/µm. Enter a value and select its original and target units.

Lumens to Watts

Estimate a light source’s power consumption from its brightness in lumens. Enter the luminous flux and select a luminous efficacy to convert lumens to watts.

Magnetic Flux

Convert magnetic flux between webers, milliwebers, microwebers, nanowebers, and maxwells. Enter a value, then choose the From unit and To unit.

Magnetic Flux Density

Convert magnetic flux density between tesla, millitesla, microtesla, nanotesla, gauss, and kilogauss. Enter a value, then choose the From unit and To unit.

Magnetomotive Force

Convert magnetomotive force between ampere-turns, kiloampere-turns, milliampere-turns, and gilberts. Enter an MMF value, then choose the units to convert from and to.

Mass Flux Density

Convert mass flux density between kg/m²·s, g/cm²·s, kg/m²·h, lb/ft²·s, and lb/ft²·h. Enter a value, then choose the units to convert from and to.

Molar Flow Rate

Convert a molar flow rate between mol/s, mmol/s, mol/min, mol/h, kmol/h, and mol/day. Enter a value, then select the starting and target units.

Moment of Inertia

Convert a moment of inertia between kg·m², g·cm², lb·ft², lb·in², and oz·in². Enter a value, then choose the From unit and To unit.

Permeability

Convert a magnetic permeability value between H/m, N/A², G·cm/Oe, and μ₀ using the calculator’s stated factors. Enter a value, then choose the From unit and To unit; see the notes below before using the μ₀ or G·cm/Oe results.

Surface Charge Density

Convert surface charge density between C/m², µC/m², nC/m², pC/m², and esu/cm². Enter a nonnegative value and select the starting and target units.

Surface Current Density

Convert surface current density between A/m, kA/m, mA/m, A/cm, and the listed electrostatic CGS unit. Enter a value and select the units to convert from and to.

Thermal Conductivity

Convert thermal conductivity between W/m·K, kW/m·K, W/cm·K, cal/s·cm·K, and BTU-based units. Enter a value, then choose the From unit and To unit.

Calculators