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Fast unit converters with formulas and tables

Xunits

Unit converters with formulas, tables, common mistakes, and expert explanations for everyday, engineering, data, medical, and scientific measurements.

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Conversion categories

Browse converter categories

01Lengthcm, in, m, ft, km 02Weight and Masskg, lb, g, oz, st 03TemperatureF, C, K 04VolumeL, gal, mL, fl oz, cup 05Aream2, ft2, ac, ha, km2 06Speedmph, kph, m/s, ft/s, kn 07Times, min, hr, d, wk 08Data StorageB, KB, MB, GB, TB 09PressurePa, kPa, bar, psi, atm 10EnergyJ, kJ, cal, kcal, Wh 11PowerW, kW, MW, hp, BTU/h 12ForceN, kN, lbf, kgf 13Anglerad, deg, grad, arcmin, arcsec 14FrequencyHz, kHz, MHz, GHz, rpm 15TorqueN m, kN m, lb ft, lb in, kgf m 16Densitykg/m3, g/cm3, g/L, lb/ft3, lb/gal 17Flow Ratem3/s, L/s, L/min, cfm, gpm 18Accelerationm/s2, ft/s2, g, Gal 19Electric CurrentA, mA, uA, kA, MA 20Electric VoltageV, mV, uV, kV, MV 21Electric ChargeC, mC, uC, Ah 22Dynamic ViscosityPa s, mPa s, cP, P, lb/ft s 23Thermal ConductivityW/m K, BTU/h ft F, cal/s cm C, kcal/h m C 24Specific HeatJ/kg K, kJ/kg K, cal/g C, kcal/kg C, BTU/lb F 25Heat FluxW/m2, kW/m2, W/cm2, BTU/h ft2, cal/s cm2 26Illuminationlx, fc, ph, nx, m-cd 27Luminancecd/m2, nt, sb, L, fL 28Radiation DoseGy, mGy, uGy, kGy, rad 29Magnetic Flux DensityT, mT, uT, G, kG 30Concentrationkg/m3, g/L, mg/L, g/m3, ug/L 31Fuel Economympg US, mpg UK, km/L, L/100 km, US gal/100 mi 32Data Transfer Ratebps, Kbps, Mbps, Gbps, B/s 33Electric Resistanceohm, mohm, uohm, kohm, Mohm 34Electric CapacitanceF, mF, uF, nF, pF 35Electric ConductanceS, mS, uS, kS, mho 36Electric InductanceH, mH, uH, nH, kH 37Magnetic FluxWb, mWb, uWb, kWb, Mx 38RadioactivityBq, kBq, MBq, Ci, mCi 39Radiation Dose EquivalentSv, mSv, uSv, rem, mrem 40Kinematic Viscositym2/s, cm2/s, mm2/s, St, cSt 41Surface TensionN/m, mN/m, dyn/cm, lbf/in, lbf/ft 42Specific Volumem3/kg, L/kg, cm3/g, ft3/lb, gal/lb 43Mass Flow Ratekg/s, kg/h, g/s, lb/s, lb/h 44Molar Concentrationmol/m3, mol/L, M, mM, uM 45Electric ConductivityS/m, mS/m, uS/cm, mS/cm, S/cm 46Electric Resistivityohm m, ohm cm, ohm mm2/m, uohm m, uohm cm 47Magnetic Field StrengthA/m, kA/m, Oe, At/m, At/in 48Luminous Fluxlm, mlm, klm, Mlm, cd sr 49Luminous Intensitycd, mcd, kcd, Mcd, cd 50Heat Transfer CoefficientW/m2 K, kW/m2 K, W/m2 C, BTU/h ft2 F, cal/s cm2 C 51Angular Velocityrad/s, deg/s, rpm, rps, turn/min 52Blood Sugarmmol/L, mg/dL, mg%, g/L, mg/L 53Electric Field StrengthV/m, kV/m, mV/m, V/cm, kV/cm 54Magnetic PermeabilityH/m, mH/m, uH/m, nH/m, H/cm 55Magnetomotive ForceAt, mAt, kAt, A, Gb 56Heat CapacityJ/K, kJ/K, cal/C, kcal/C, BTU/F 57Thermal ResistanceK/W, C/W, K/kW, K/mW, F h/BTU 58Energy DensityJ/m3, kJ/m3, MJ/m3, J/L, Wh/L 59Mass Fluxkg/m2 s, g/cm2 s, kg/m2 h, lb/ft2 s, lb/ft2 h 60Parts per Millionfraction, %, permille, ppm, ppb

Conversion categories

Start with the measurement you need

01

Length

Convert metric, imperial, and US customary length units for height, distance, construction, and everyday measurements.

Open length converter
02

Weight and Mass

Convert common weight and mass units for body weight, shipping, cooking, science, and fitness tracking.

Open weight and mass converter
03

Temperature

Convert Celsius, Fahrenheit, and Kelvin values for weather, cooking, science, and engineering.

Open temperature converter
04

Volume

Convert liquid volume units for fuel, water, recipes, containers, and household measurements.

Open volume converter
05

Area

Convert land, floor, and surface area units including acres, square feet, square meters, and hectares.

Open area converter
06

Speed

Convert speed units for driving, running, aviation, weather, and physics calculations.

Open speed converter
07

Time

Convert seconds, minutes, hours, days, weeks, months, and years for schedules and calculations.

Open time converter
08

Data Storage

Convert digital storage units including bytes, kilobytes, megabytes, gigabytes, and terabytes.

Open data storage converter
09

Pressure

Convert pressure units for tires, weather, hydraulics, engineering, pumps, and industrial measurements.

Open pressure converter
10

Energy

Convert energy units for electricity, nutrition, heating, physics, appliances, and engineering work.

Open energy converter
11

Power

Convert power units for engines, motors, appliances, HVAC systems, electricity, and mechanical output.

Open power converter
12

Force

Convert force units for mechanics, lifting, structural loads, machine ratings, and physics calculations.

Open force converter
13

Angle

Convert angle units for geometry, trigonometry, navigation, surveying, machining, and engineering.

Open angle converter
14

Frequency

Convert frequency units for electronics, signals, audio, radio, computing, and rotational speed.

Open frequency converter
15

Torque

Convert torque units for engines, motors, fasteners, tools, machinery, and mechanical engineering.

Open torque converter
16

Density

Convert density units for materials, fluids, chemistry, engineering, and product specifications.

Open density converter
17

Flow Rate

Convert flow rate units for water systems, pumps, HVAC, process engineering, and fluid calculations.

Open flow rate converter
18

Acceleration

Convert acceleration units for physics, vehicles, motion analysis, vibration, and engineering calculations.

Open acceleration converter
19

Electric Current

Convert electric current units for electronics, circuits, power supplies, sensors, and electrical specifications.

Open electric current converter
20

Electric Voltage

Convert electric voltage units for electronics, power systems, batteries, sensors, and electrical design.

Open electric voltage converter
21

Electric Charge

Convert electric charge units for physics, batteries, circuits, electrochemistry, and electrical calculations.

Open electric charge converter
23

Thermal Conductivity

Convert thermal conductivity units for insulation, materials, heat transfer, HVAC, and engineering specifications.

Open thermal conductivity converter
24

Specific Heat

Convert specific heat capacity units for materials, thermal analysis, chemistry, HVAC, and energy calculations.

Open specific heat converter
25

Heat Flux

Convert heat flux density units for heat transfer, solar radiation, thermal systems, furnaces, and engineering analysis.

Open heat flux converter
26

Illumination

Convert illuminance units for lighting design, photography, workplaces, architecture, and optical calculations.

Open illumination converter
27

Luminance

Convert luminance units for displays, lighting, photometry, optical instruments, and visual performance calculations.

Open luminance converter
28

Radiation Dose

Convert absorbed radiation dose units for physics, radiation measurement, dosimetry references, and lab calculations.

Open radiation dose converter
29

Magnetic Flux Density

Convert magnetic flux density units for magnets, sensors, motors, MRI references, physics, and electrical engineering.

Open magnetic flux density converter
30

Concentration

Convert mass concentration units for water quality, chemistry, environmental data, dosing, and laboratory measurements.

Open concentration converter
31

Fuel Economy

Convert fuel economy and fuel consumption units for cars, travel, vehicle specifications, and international MPG comparisons.

Open fuel economy converter
32

Data Transfer Rate

Convert data transfer rate units for internet speed, bandwidth, downloads, uploads, network links, and storage throughput.

Open data transfer rate converter
33

Electric Resistance

Convert electric resistance units for circuits, sensors, resistors, cables, electronics, and electrical engineering.

Open electric resistance converter
36

Electric Inductance

Convert inductance units for inductors, coils, transformers, RF circuits, power electronics, and electrical design.

Open electric inductance converter
37

Magnetic Flux

Convert magnetic flux units for electromagnetics, motors, generators, sensors, magnetic circuits, and physics.

Open magnetic flux converter
38

Radioactivity

Convert radioactivity units for nuclear physics, lab activity, isotope references, radiation safety, and medical sources.

Open radioactivity converter
40

Kinematic Viscosity

Convert kinematic viscosity units for oils, fluids, hydraulics, lubrication, process data, and material specifications.

Open kinematic viscosity converter
41

Surface Tension

Convert surface tension units for fluids, coatings, inks, chemistry, materials testing, and process engineering.

Open surface tension converter
42

Specific Volume

Convert specific volume units for thermodynamics, fluids, steam tables, gas properties, and engineering calculations.

Open specific volume converter
43

Mass Flow Rate

Convert mass flow rate units for process engineering, HVAC, fuel systems, chemical plants, and fluid calculations.

Open mass flow rate converter
44

Molar Concentration

Convert molar concentration units for chemistry, lab solutions, analytical data, reaction calculations, and dilution work.

Open molar concentration converter
45

Electric Conductivity

Convert electric conductivity units for water quality, materials, sensors, chemistry, electronics, and industrial measurements.

Open electric conductivity converter
46

Electric Resistivity

Convert electric resistivity units for materials, wires, conductors, semiconductors, geophysics, and electrical testing.

Open electric resistivity converter
48

Luminous Flux

Convert luminous flux units for lighting output, lamps, LEDs, projectors, fixtures, photometry, and optical specifications.

Open luminous flux converter
49

Luminous Intensity

Convert luminous intensity units for LEDs, lamps, optical instruments, photometry, beacons, and lighting specifications.

Open luminous intensity converter
50

Heat Transfer Coefficient

Convert heat transfer coefficient units for convection, heat exchangers, HVAC, thermal design, process equipment, and building physics.

Open heat transfer coefficient converter
51

Angular Velocity

Convert angular velocity units for rotating machinery, motors, wheels, turbines, robotics, physics, and motion analysis.

Open angular velocity converter
52

Blood Sugar

Convert blood glucose units for diabetes tracking, lab reports, medical devices, nutrition logs, and international glucose readings.

Open blood sugar converter
54

Magnetic Permeability

Convert magnetic permeability units for materials, electromagnetics, inductors, magnetic cores, and physics references.

Open magnetic permeability converter
55

Magnetomotive Force

Convert magnetomotive force units for coils, magnetic circuits, motors, transformers, solenoids, and electromagnets.

Open magnetomotive force converter
56

Heat Capacity

Convert heat capacity units for thermal systems, calorimetry, materials, energy storage, heating, and engineering calculations.

Open heat capacity converter
57

Thermal Resistance

Convert thermal resistance units for electronics cooling, heat sinks, HVAC, insulation, thermal design, and heat-flow calculations.

Open thermal resistance converter
58

Energy Density

Convert energy density units for fuels, batteries, gases, materials, thermal storage, and engineering comparisons.

Open energy density converter
59

Mass Flux

Convert mass flux units for fluid flow, filtration, process engineering, membranes, combustion, and transport calculations.

Open mass flux converter
60

Parts per Million

Convert ppm, ppb, ppt, percent, per mille, and fraction values for concentration ratios, water quality, chemistry, and environmental data.

Open parts per million converter

What is a unit converter?

A unit converter is a calculator that changes a measurement from one unit into another equivalent unit. For example, it can convert centimeters to inches, kilograms to pounds, or Fahrenheit to Celsius.

The goal is simple: enter a value, choose a measurement category, choose the units, and get the converted result with the formula shown below it.

How unit conversion works

Most measurement conversions use a conversion factor. A conversion factor tells you how many units of one measurement equal another measurement.

1 inch = 2.54 centimeters

Once you know the factor, you can multiply or divide the original value to get the answer.

How to convert units by hand

To convert by hand, find the correct conversion factor first. Then apply the formula carefully and keep the unit label with the answer.

  1. Write down the value you want to convert.
  2. Find the relationship between the two units.
  3. Multiply or divide by the conversion factor.
  4. Round the result only after the calculation is complete.

Common conversion examples

ConversionFormulaExample
cm to inchesinches = cm / 2.5410 cm = 3.937 inches
kg to lbspounds = kg x 2.20462262185 kg = 11.023 lbs
Fahrenheit to CelsiusC = (F - 32) x 5 / 968 F = 20 C

FAQ

What is a unit converter?

A unit converter changes a measurement from one unit to an equivalent value in another unit, such as centimeters to inches, kilograms to pounds, or Fahrenheit to Celsius.

How accurate are Xunits converters?

Xunits uses standard conversion factors and shows formulas so results can be checked. Displayed answers may be rounded for readability, while the formula explains the underlying relationship.

Why do some conversions use formulas instead of simple factors?

Most conversions use multiplication or division by a factor. Temperature and fuel economy can require offset or reciprocal formulas, so Xunits treats those categories separately.

What are the most common unit conversions?

Common searches include cm to inches, inches to cm, kg to lbs, lbs to kg, Fahrenheit to Celsius, meters to feet, liters to gallons, miles to kilometers, and square feet to square meters.

Can I browse all conversion pages?

Yes. The site index lists every converter category and generated conversion page, while category pages group related units and popular conversions.