Mechanical, structural, and rotational kinematics converters including angular velocity, linear and angular acceleration, density, specific volume, moment of inertia, moment of force, and torque.

Velocity - Angular Converter5 units

Units: rad/s, °/s, r/min, r/s, r/h

Open Velocity - Angular Calculator

Acceleration Converter5 units

Units: m/s², g, ft/s², in/s², Gal

Open Acceleration Calculator

Acceleration - Angular Converter4 units

Units: rad/s², °/s², r/s², RPM/s

Open Acceleration - Angular Calculator

Density & Concentration Converter13 units

Units: kg/m³, g/cm³, g/mL, g/L, mg/L

Open Density & Concentration Calculator

Specific Volume Converter5 units

Units: m³/kg, L/kg, cm³/g, ft³/lb, gal/lb

Open Specific Volume Calculator

Moment of Inertia Converter6 units

Units: kg·m², kg·cm², g·cm², lb·ft², lb·in²

Open Moment of Inertia Calculator

Moment of Force Converter6 units

Units: N·m, kN·m, lbf·ft, lbf·in, kgf·m

Open Moment of Force Calculator

Torque Converter11 units

Units: N·m, N·cm, N·mm, kN·m, lb·ft

Open Torque Calculator

Heat & Thermodynamics Converters

10 Converters

Thermal engineering and calorimetry calculators for mass/volume fuel efficiency, temperature intervals, thermal expansion, thermal resistance, conductivity, specific heat capacity, heat density, and heat transfer.

Fuel Efficiency - Mass Converter5 units

Units: J/kg, kJ/kg, MJ/kg, cal/g, BTU/lb

Open Fuel Efficiency - Mass Calculator

Fuel Efficiency - Volume Converter6 units

Units: J/m³, MJ/m³, kJ/L, MJ/L, BTU/ft³

Open Fuel Efficiency - Volume Calculator

Temperature Interval Converter4 units

Units: ΔK, Δ°C, Δ°F, Δ°R

Open Temperature Interval Calculator

Thermal Expansion Converter5 units

Units: 1/K, 1/°C, 1/°F, ppm/K, ppm/°F

Open Thermal Expansion Calculator

Thermal Resistance Converter4 units

Units: K/W, °C/W, °F·h/BTU, °F·s/BTU

Open Thermal Resistance Calculator

Thermal Conductivity Converter6 units

Units: W/(m·K), W/(cm·°C), kW/(m·K), cal/(s·cm·°C), BTU/(h·ft·°F)

Open Thermal Conductivity Calculator

Specific Heat Capacity Converter5 units

Units: J/(kg·K), kJ/(kg·K), J/(g·°C), cal/(g·°C), BTU/(lb·°F)

Open Specific Heat Capacity Calculator

Heat Density Converter5 units

Units: J/m², kJ/m², MJ/m², Ly, BTU/ft²

Open Heat Density Calculator

Heat Flux Density Converter5 units

Units: W/m², kW/m², W/cm², W/in², BTU/(h·ft²)

Open Heat Flux Density Calculator

Heat Transfer Coefficient Converter5 units

Units: W/(m²·K), W/(m²·°C), kW/(m²·K), BTU/(h·ft²·°F), cal/(s·cm²·°C)

Open Heat Transfer Coefficient Calculator

Fluids & Chemical Converters

10 Converters

Fluid dynamics, rheology, and chemical process converters covering volumetric, mass, and molar flow rates, mass flux density, molar/solution concentration, dynamic/kinematic viscosity, surface tension, and permeability.

Flow Rate Converter13 units

Units: L/min, L/s, L/h, mL/min, mL/h

Open Flow Rate Calculator

Flow - Mass Converter8 units

Units: kg/s, kg/min, kg/h, g/s, t/h

Open Flow - Mass Calculator

Flow - Molar Converter7 units

Units: mol/s, kmol/s, kmol/h, mol/min, mol/h

Open Flow - Molar Calculator

Mass Flux Density Converter5 units

Units: kg/(s·m²), kg/(h·m²), g/(s·cm²), lb/(s·ft²), lb/(h·ft²)

Open Mass Flux Density Calculator

Concentration - Molar Converter5 units

Units: mol/m³, mol/L, mmol/L, µmol/L, kmol/m³

Open Concentration - Molar Calculator

Concentration - Solution Converter6 units

Units: kg/L, g/L, mg/L, g/dL, lb/gal

Open Concentration - Solution Calculator

Viscosity - Dynamic Converter6 units

Units: Pa·s, mPa·s, P, cP, lb/(ft·s)

Open Viscosity - Dynamic Calculator

Viscosity - Kinematic Converter5 units

Units: m²/s, mm²/s, St, cSt, ft²/s

Open Viscosity - Kinematic Calculator

Surface Tension Converter5 units

Units: N/m, mN/m, dyn/cm, gf/cm, lbf/in

Open Surface Tension Calculator

Permeability Converter5 units

Units: m², D, mD, µD, µm²

Open Permeability Calculator

Light & Optics Converters

5 Converters

Photometry, radiometry, display resolution, and wave frequency calculators including luminance, luminous intensity, illumination (lux to foot-candles), digital image resolution, and frequency/wavelength.

Luminance Converter6 units

Units: cd/m², kcd/m², sb, L, fL

Open Luminance Calculator

Luminous Intensity Converter5 units

Units: cd, mcd, kcd, lm/sr, HK

Open Luminous Intensity Calculator

Illumination Converter6 units

Units: lx, klx, mlx, fc, ph

Open Illumination Calculator

Digital Image Resolution Converter4 units

Units: dpm, DPI, dpcm, dpmm

Open Digital Image Resolution Calculator

Frequency Converter9 units

Units: Hz, kHz, MHz, GHz, THz

Open Frequency Calculator

Electricity Converters

15 Converters

Electrical engineering and electrostatic converters for charge, linear/surface/volume charge density, current, linear/surface current density, electric field, voltage potential, resistance, resistivity, conductance, conductivity, capacitance, and inductance.

Electric Charge Converter8 units

Units: C, kC, mC, µC, nC

Open Electric Charge Calculator

Linear Charge Density Converter5 units

Units: C/m, mC/m, µC/m, C/cm, C/in

Open Linear Charge Density Calculator

Surface Charge Density Converter5 units

Units: C/m², mC/m², µC/m², C/cm², C/in²

Open Surface Charge Density Calculator

Volume Charge Density Converter5 units

Units: C/m³, mC/m³, µC/m³, C/cm³, C/in³

Open Volume Charge Density Calculator

Electric Current Converter4 units

Units: A, mA, µA, kA

Open Electric Current Calculator

Linear Current Density Converter5 units

Units: A/m, A/cm, A/in, mA/m, Oe

Open Linear Current Density Calculator

Surface Current Density Converter5 units

Units: A/m², kA/m², A/cm², A/mm², A/in²

Open Surface Current Density Calculator

Electric Field Strength Converter7 units

Units: V/m, kV/m, kV/cm, V/cm, V/mm

Open Electric Field Strength Calculator

Electric Potential Converter7 units

Units: V, mV, µV, kV, MV

Open Electric Potential Calculator

Electrical Resistance Converter5 units

Units: Ω, kΩ, MΩ, mΩ, µΩ

Open Electrical Resistance Calculator

Electric Resistivity Converter5 units

Units: Ω·m, Ω·cm, µΩ·cm, Ω·mm²/m, µΩ·in

Open Electric Resistivity Calculator

Electric Conductance Converter5 units

Units: S, mS, µS, kS, ℧

Open Electric Conductance Calculator

Electric Conductivity Converter6 units

Units: S/m, mS/m, mS/cm, µS/cm, MS/m

Open Electric Conductivity Calculator

Capacitance Converter6 units

Units: F, mF, µF, nF, pF

Open Capacitance Calculator

Inductance Converter4 units

Units: H, mH, µH, nH

Open Inductance Calculator

Magnetism Converters

4 Converters

Electromagnetic field and flux calculators for magnetomotive force (ampere-turns to gilberts), magnetic field strength (A/m to oersteds), magnetic flux (webers to maxwells), and magnetic flux density (tesla to gauss).

Radiology & Dosimetry Converters

4 Converters

Health physics and ionizing radiation converters for equivalent dose (sieverts to rem), radioactive activity (becquerels to curies), radiation exposure (roentgens to C/kg), and absorbed dose (grays to rad).

Radiation Converter5 units

Units: Sv, mSv, µSv, rem, mrem

Open Radiation Calculator

Radiation-Activity Converter8 units

Units: Bq, kBq, MBq, GBq, Ci

Open Radiation-Activity Calculator

Radiation-Exposure Converter5 units

Units: C/kg, mC/kg, µC/kg, R, mR

Open Radiation-Exposure Calculator

Radiation-Absorbed Dose Converter6 units

Units: Gy, cGy, mGy, µGy, rad

Open Radiation-Absorbed Dose Calculator

Other & Specialty Converters

5 Converters

Specialized measurement calculators for SI metric prefixes, network data transfer rates, acoustic sound pressure, DTP/CSS typography units, and forestry lumber board-foot volume.

Prefixes Converter12 units

Units: 1, T, G, M, k

Open Prefixes Calculator

Data Transfer Converter8 units

Units: bps, Kbps, Mbps, Gbps, B/s

Open Data Transfer Calculator

Sound Converter4 units

Units: Pa, mPa, µPa, µbar

Open Sound Calculator

Typography Converter6 units

Units: pt, pc, px, twip, mm

Open Typography Calculator

Volume - Lumber Converter5 units

Units: FBM, MBF, ft³, m³, cord

Open Volume - Lumber Calculator

Direct Unit-to-Unit Conversions

High-frequency metric and imperial unit conversion calculators with formulas and reference tables.

Browse All Pair Calculators

Common Unit Systems & Measurement Guides

SI (International System of Units), Metric, Imperial, and US Customary reference documentation

Platform Tools, Widgets & Legal Pages

Direct navigation to core site directories, embeddable calculator widgets, and legal documentation

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References

NIST · BIPM · ISO

[1]
NIST (NIST HB 133 / SP 811)·Checking the Net Contents of Packaged Goods, Handbook 133 - 2019 Edition & NIST SP 811
NIST HB 133 Standard
[2]
BIPM (BIPM SI-9)·The International System of Units (SI Brochure, 9th Edition)
BIPM SI Brochure
[3]
NIST SP 811 (NIST SP 811 App. B.9)·NIST Guide to the SI, Appendix B.9: Factors for Units Listed by Kind of Quantity or Field of Science
NIST SP 811 Appendix B.9