Unit Converter

The complete ToolsEngg conversion library — 73 categories spanning everyday, engineering, heat, fluids, light, electricity, magnetism and radiology units. Every converter runs locally in your browser with exact conversion factors, full unit tables and popular pair pages.

LENGTH CONVERTER — INSTANT RESULT
CommonEngineeringHeatFluidsLightElectricityMagnetismRadiologyOther

Common Converters

Everyday workshop conversions — length, weight, temperature, volume, pressure, speed and more.

Lengthkm, m, cm, mm, µm, nm…24 UNITS →Weight and Masst, kg, g, mg, µg, q…20 UNITS →Temperature°C, °F, K, °R, °Ré…5 UNITS →Volumem³, L, mL, cm³, km³, in³…23 UNITS →Areakm², m², ha, a, cm², mm²…13 UNITS →PressurePa, kPa, MPa, bar, mbar, atm…15 UNITS →EnergyJ, kJ, MJ, GJ, cal, kcal…18 UNITS →PowerW, kW, MW, GW, mW, hp…14 UNITS →ForceN, kN, MN, mN, dyn, kgf…13 UNITS →Timens, µs, ms, s, min, h…14 UNITS →Speedm/s, km/h, m/min, mph, ft/s, in/s…10 UNITS →Angle°, rad, gon, ′, ″, rev…10 UNITS →Fuel Consumptionkm/L, m/L, mpg (US), mpg (UK), L/100km, gal/100mi…6 UNITS →Data Storagebit, nibble, B, KB, MB, GB…16 UNITS →

Engineering Converters

Mechanical & process engineering units — torque, viscosity, density, flow and specific volume.

Angular Velocityrad/s, rad/min, rpm, rps, rph, °/s…9 UNITS →Accelerationm/s², g, ft/s², in/s², Gal, mGal…8 UNITS →Angular Accelerationrad/s², °/s², rev/s², rev/min², rpm/s…5 UNITS →Densitykg/m³, g/cm³, g/mL, kg/L, g/L, mg/L…13 UNITS →Specific Volumem³/kg, cm³/g, L/kg, L/g, ft³/lb, in³/lb…8 UNITS →Moment of Inertiakg·m², g·cm², kg·cm², lb·ft², lb·in², oz·in²…9 UNITS →TorqueN·m, N·mm, kN·m, kgf·m, kgf·cm, gf·cm…11 UNITS →

Heat Converters

Thermodynamics — thermal conductivity, heat capacity, entropy and heat flux density.

Temperature IntervalK, Δ°C, Δ°F, Δ°R, Δ°Ré…5 UNITS →Thermal Expansion1/K, 1/°C, 1/°F, 1/°R…4 UNITS →Thermal ResistanceK/W, °C/W, °F·h/BTU, °F·s/BTU…4 UNITS →Thermal ConductivityW/m·K, kW/m·K, BTU·in/h·ft²·°F, BTU/h·ft·°F, cal/s·cm·°C, kcal/h·m·°C…6 UNITS →Specific Heat CapacityJ/kg·K, kJ/kg·K, J/g·°C, cal/g·°C, kcal/kg·°C, BTU/lb·°F…7 UNITS →Heat Flux DensityW/m², kW/m², W/cm², BTU/h·ft², cal/s·cm², hp/ft²…6 UNITS →Heat Transfer CoefficientW/m²·K, kW/m²·K, BTU/h·ft²·°F, BTU/s·ft²·°F, kcal/h·m²·°C, cal/s·cm²·°C…6 UNITS →Fuel Efficiency (Mass)J/kg, kJ/kg, MJ/kg, cal/g, kcal/kg, BTU/lb…8 UNITS →Fuel Efficiency (Volume)J/m³, kJ/m³, MJ/m³, J/L, BTU/ft³, kcal/m³…8 UNITS →

Fluids Converters

Fluid mechanics — flow rates, surface tension, permeability and concentration units.

Flowm³/s, m³/min, m³/h, L/s, L/min, L/h…15 UNITS →Flow (Mass)kg/s, kg/min, kg/h, kg/d, g/s, g/min…12 UNITS →Mass Flux Densityg/s·m², kg/s·m², kg/h·m², g/s·cm², lb/s·ft², lb/h·ft²…7 UNITS →Concentration (Solution)mol/L, mol/m³, mmol/L, µmol/L, mol/cm³, mmol/m³…8 UNITS →Viscosity (Dynamic)Pa·s, mPa·s, P, cP, kg/m·s, g/cm·s…11 UNITS →Viscosity (Kinematic)m²/s, St, cSt, ft²/s, ft²/h, in²/s…7 UNITS →Surface TensionN/m, mN/m, dyn/cm, erg/cm², gf/cm, kgf/m…8 UNITS →Permeabilitym², D, mD, cm², ft², µm²…6 UNITS →

Light Converters

Photometry & illumination — luminance, illuminance, luminous intensity and exposure.

Luminancecd/m², kcd/m², sb, L, mL, fL…9 UNITS →Luminous Intensitycd, c (int.), HK, carcel, bd, lm/sr…6 UNITS →Illuminationlx, fc, ph, nx, m·cd, flame…6 UNITS →Digital Image Resolutiondpi, ppi, dot/mm, dot/cm, dot/m…5 UNITS →Frequency WavelengthHz, kHz, MHz, GHz, THz, km…11 UNITS →

Electricity Converters

Electrical units — current, voltage, resistance, capacitance, inductance and charge.

Electric ChargeC, kC, mC, µC, nC, A·h…10 UNITS →Electric CurrentA, mA, µA, kA, MA, Bi…7 UNITS →Electric Potential (Voltage)V, mV, µV, kV, MV, W/A…8 UNITS →Electric ResistanceΩ, mΩ, µΩ, kΩ, MΩ, GΩ…10 UNITS →Electric ResistivityΩ·m, Ω·cm, Ω·mm, µΩ·m, µΩ·cm, nΩ·m…8 UNITS →Electric ConductanceS, mS, µS, kS, MS, ab℧…8 UNITS →Electric ConductivityS/m, S/cm, mS/cm, µS/cm, MS/m, % IACS…7 UNITS →Electrostatic CapacitanceF, mF, µF, nF, pF, fF…9 UNITS →InductanceH, mH, µH, nH, pH, kH…9 UNITS →Electric Field StrengthV/m, kV/m, MV/m, V/cm, V/mm, mV/m…9 UNITS →Linear Charge DensityC/m, C/cm, C/in, mC/m, abC/m, abC/cm…6 UNITS →Surface Charge DensityC/m², C/cm², C/in², mC/m², µC/m², abC/cm²…6 UNITS →Volume Charge DensityC/m³, C/cm³, C/in³, mC/m³, µC/m³, abC/cm³…6 UNITS →Linear Current DensityA/m, A/cm, A/in, kA/m, Oe, Gi/cm…6 UNITS →Surface Current DensityA/m², A/cm², A/mm², A/in², A/cmil, kA/m²…6 UNITS →

Magnetism Converters

Magnetic units — flux, flux density, field strength and magnetomotive force.

Magnetomotive ForceAt, kAt, mAt, Gi, abAt…5 UNITS →Magnetic Field StrengthA/m, At/m, kA/m, Oe, A/cm, A/in…6 UNITS →Magnetic FluxWb, mWb, µWb, V·s, Mx, G·cm²…10 UNITS →Magnetic Flux DensityT, mT, µT, nT, G, mG…10 UNITS →

Radiology Converters

Radiation & radioactivity — absorbed dose, equivalent dose, exposure and activity.

RadioactivityBq, kBq, MBq, GBq, TBq, Ci…12 UNITS →Radiation Absorbed DoseGy, mGy, µGy, cGy, rad, mrad…8 UNITS →Radiation ExposureC/kg, mC/kg, µC/kg, R, mR, µR…8 UNITS →Radiation Dose EquivalentSv, mSv, µSv, rem, mrem…5 UNITS →

Other Converters

Specialised categories — numbers, typography, frequency-wavelength and more.

Metric PrefixesQ, R, Y, Z, E, P…25 UNITS →Data Transfer Ratebit/s, kbit/s, Mbit/s, Gbit/s, B/s, kB/s…16 UNITS →SoundB, dB, Np…3 UNITS →Typographypt, pica, in, mm, cm, px…11 UNITS →Volume (Dry)m³, L, hL, bu (US), bu (UK), pk (US)…13 UNITS →Volume (Lumber)m³, ft³, in³, FBM, MFBM, cord…12 UNITS →Numbers (Base)base 2, base 3, base 4, base 8, base 10, base 12…9 UNITS →

Most-used conversions

mm to inchesinches to mmkg to lbs°C to °Fliters to gallonsbar to psikJ to kcalhp to kWmph to km/hacres to sq ftN·m to ft·lbL/min to GPM