Free Engineering Tools

Unit Converters for Engineers

Fast, accurate unit conversion for process instrumentation, electrical, mechanical and everyday units. Every converter has its own page with formulas, conversion tables and worked examples.

76converters

714+units

10categories

Search converters or units

Common Converters Engineering Converters Heat Converters Fluids Converters Light Converters Electricity Converters Magnetism Converters Radiology Converters Instrumentation Tools Other Converters

No converter matches your search. Try a unit symbol such as bar, gpm or kWh.

Common Converters

Everyday units for length, weight, volume, temperature, pressure, energy and more. 14 converters.

Length Converterin, mm, ft, m Weight Converterkg, lb, g, oz Volume Convertergal, L, m³, ft³ Temperature Converter°C, °F, K Area Converterft², m², ac, ha Pressure Converterbar, psi, kg/cm², kPa Energy ConverterkWh, MJ, BTU, kJ Power Converterhp, kW, BTU/h, W Force Converterkgf, N, lbf, kN Time Converterh, min, d, s Speed Converterkm/h, mph, m/s, kn Angle Converter°, rad, gon, ′Fuel Consumption Convertermpg (US), L/100 km, km/L, mpg (UK)Data Storage ConverterGB, MB, kB, TB

Engineering Converters

Mechanical quantities used in machine design, motors and drives. 7 converters.

Angular Velocity Converterrpm, rad/s, rps, °/s Acceleration Converterg, m/s², ft/s², Gal Angular Acceleration Converterrpm/s, rad/s², °/s² Density Converterkg/m³, lb/ft³, g/cm³, lb/gal Specific Volume Converterm³/kg, ft³/lb, L/kg Moment of Inertia Converterkg·m², lb·ft², kg·cm², lb·in² Torque ConverterN·m, lbf·ft, kgf·m, lbf·in

Heat Converters

Thermal properties for heat transfer, HVAC and process calculations. 9 converters.

Temperature Interval Converter°C, °F, K Thermal Expansion Converterppm/K, ppm/°F, 1/°F, 1/K Thermal Resistance Converter°C/W, K/W, h·°F/BTU Thermal Conductivity ConverterW/(m·K), BTU/(h·ft·°F), kcal/(h·m·°C), BTU·in/(h·ft²·°F)Specific Heat Capacity ConverterkJ/(kg·K), BTU/(lb·°F), cal/(g·°C), J/(kg·K)Heat Flux Density ConverterW/m², BTU/(h·ft²), kcal/(h·m²)Heat Transfer Coefficient ConverterW/(m²·K), BTU/(h·ft²·°F), kcal/(h·m²·°C)Specific Energy ConverterBTU/lb, kJ/kg, kcal/kg, MJ/kg Energy Density ConverterBTU/ft³, MJ/m³, kcal/m³, kWh/m³

Fluids Converters

Flow rate, viscosity, concentration and valve sizing units for process plants. 11 converters.

Volumetric Flow Rate ConverterGPM, m³/h, L/min, CFM Mass Flow Rate Converterkg/h, lb/h, t/h, kg/s Molar Flow Rate Converterkmol/h, mol/s, lbmol/h Mass Flux Density Converterlb/(ft²·h), kg/(m²·s), lb/(ft²·s), kg/(m²·h)Molar Concentration Convertermol/L, mmol/L, µmol/L, mol/m³ Mass Concentration Convertermg/L, g/L, ppm, gr/gal Dynamic Viscosity ConvertercP, Pa·s, P, lb/(ft·s)Kinematic Viscosity ConvertercSt, m²/s, St, ft²/s Surface Tension Converterdyn/cm, mN/m, N/m, lbf/in Permeability ConverterD, m², mD Flow Coefficient ConverterCv, Kv, Cv (UK), Av

Light Converters

Photometric units, frequency and image resolution. 5 converters.

Illuminance Converterfc, lx, ph Luminance Converternt, fL, L, cd/m² Luminous Intensity Convertermcd, cd, HK Frequency ConverterHz, rpm, kHz, MHz Image Resolution Converterdpi, dot/cm, dot/mm

Electricity Converters

Voltage, current, resistance, capacitance and other electrical units. 15 converters.

Voltage ConvertermV, V, kV, µV Electric Current ConvertermA, A, µA, kA Electric Charge ConvertermAh, C, Ah Electric Resistance ConverterkΩ, Ω, MΩ, mΩ Electric Resistivity ConverterΩ·mm²/m, Ω·m, Ω·cm, µΩ·cm Electric Conductance ConvertermS, S, µS, ℧Electric Conductivity ConverterµS/cm, mS/cm, S/m Capacitance ConverterµF, nF, pF, F Inductance ConvertermH, µH, nH, H Electric Field Strength ConverterkV/mm, V/mil, kV/cm, V/m Charge Density ConverterC/cm³, C/m³, C/in³, µC/cm³ Surface Charge Density ConverterµC/cm², C/m², C/cm², µC/m² Linear Charge Density ConverterC/in, C/m, C/cm, µC/m Current Density ConverterA/mm², A/in², A/cm², A/m² Linear Current Density ConverterA/cm, A/m, A/in

Magnetism Converters

Magnetic flux, flux density, field strength and magnetomotive force. 4 converters.

Magnetic Flux Density ConverterG, T, mT, γ Magnetic Flux ConverterMx, Wb, mWb, µWb Magnetic Field Strength ConverterOe, A/m, kA/m Magnetomotive Force ConverterGi, At, kAt

Radiology Converters

Radiation dose, exposure and radioactivity units. 4 converters.

Absorbed Dose Converterrad, Gy, mGy, mrad Equivalent Dose Converterrem, Sv, mSv, mrem Radioactivity ConverterCi, GBq, mCi, MBq Radiation Exposure ConverterR, C/kg, mR, µC/kg

Instrumentation Tools

Signal scaling and field tools for instrument and control engineers. 1 converter.

4 to 20 mA Calculator ConvertermA, V, %, process value

Other Converters

Number systems, SI prefixes, data rates, typography and more. 6 converters.

Number System Converterbinary, octal, decimal, hex Metric Prefix ConverterM, k, m, µ Data Transfer Rate ConverterMbps, MB/s, Gbps, kbps Amount of Substance Converterlbmol, kmol, mol, mmol Typography Converterpt, px, mm, pc Lumber Volume ConverterFBM, m³, cd, MBF

About These Unit Converters

Engineers switch between unit systems all day. A pressure gauge may read in psi while the P&ID says bar, a pump curve is in US GPM while the flow meter is ranged in m³/h, and a datasheet quotes viscosity in centipoise while the sizing software wants Pa·s.

We built this library to make those conversions quick and reliable. Each converter uses exact or internationally accepted conversion factors and shows the formula behind the answer, so you can check the maths and use it in your own calculations.

How to use a converter

Pick a converter from the categories above or use the search box.
Type your value and choose the From and To units.
Read the result, the formula and the full table of equivalent values in every unit.

Frequently Asked Questions

Are these unit converters free to use?

Yes. Every converter on instrumentationblog.in is free, works in any browser and needs no sign up or download.

How accurate are the conversions?

All 714 units are stored using exact definitions where they exist (for example 1 inch = 0.0254 m and 1 lb = 0.45359237 kg) or internationally accepted values from NIST and the SI brochure. You can choose up to 12 significant digits on each converter.

Which converters are most useful for instrumentation engineers?

Pressure, volumetric and mass flow, temperature, viscosity, density, flow coefficient (Cv and Kv), electrical conductivity and the 4 to 20 mA calculator cover most day to day transmitter ranging, valve sizing and calibration work.

Can I link directly to a specific conversion?

Yes. Add from, to and v parameters to any converter link, for example ?from=bar&to=psi&v=10, and the page opens with those units and value already selected.

Popular Conversions