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Engineering Unit Converter

Free reference guide: Engineering Unit Converter

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About Engineering Unit Converter

The Engineering Unit Converter is a comprehensive reference for unit conversions across six categories essential to engineering practice. The length section covers mm to m, cm to inches, meters to feet, km to miles, yards to meters, and micrometers to millimeters with exact conversion factors. The mass section includes grams to kilograms, kg to pounds, ounces to grams, metric/short/long tons, and milligrams to grams.

Temperature conversions provide the exact formulas: Celsius to Fahrenheit (F = C*9/5 + 32), Fahrenheit to Celsius (C = (F-32)*5/9), Celsius to Kelvin (K = C + 273.15), and Kelvin to Celsius, with reference points including body temperature (37C = 98.6F), absolute zero (-273.15C = 0K), and the C/F equal point (-40). Pressure conversions span Pascal, bar, atmosphere, psi, and mmHg with cross-references like 1 atm = 101,325 Pa = 14.696 psi = 760 mmHg.

The engineering-specific section goes beyond basic units to cover dynamic viscosity (Pa*s to centipoise with reference values for water, honey, and air), thermal conductivity (W/(m*K) to BTU/(h*ft*F) with copper, aluminum, stainless steel values), specific heat capacity (J/(kg*K) to BTU/(lb*F)), torque (N*m to lbf*ft with bolt torque examples), and stress conversion (MPa to ksi with yield strengths for mild steel, aluminum 6061-T6, and Ti-6Al-4V).

Key Features

  • Length conversions: mm/m, cm/in (1in = 2.54cm), m/ft, km/mi, yd/m, um/mm with exact factors
  • Mass conversions: g/kg, kg/lb (1kg = 2.20462lb), oz/g, metric/short/long ton, mg/g
  • Temperature formulas: C to F (C*9/5+32), F to C ((F-32)*5/9), C to K (+273.15) with reference points
  • Pressure cross-reference: 1 atm = 101,325 Pa = 1.01325 bar = 760 mmHg = 14.696 psi
  • Energy conversions: J/cal (1cal = 4.184J), kWh/J (1kWh = 3.6MJ), BTU/J, eV/J for physics
  • Dynamic viscosity: Pa*s to cP with material values (water 1.002cP, honey ~2000-10000cP, air 0.018cP)
  • Thermal conductivity and specific heat with reference materials (copper 401, aluminum 237 W/(m*K))
  • Torque (N*m to lbf*ft) and stress (MPa to ksi) with material yield strength reference values

Frequently Asked Questions

How do I convert between metric and imperial length units?

Key factors: 1 inch = 2.54 cm (exact), 1 foot = 0.3048 m, 1 mile = 1.60934 km, 1 yard = 0.9144 m. For precision work: 1 micrometer = 0.001 mm. Examples: 30 cm = 11.811 in, 1.8 m = 5.905 ft, 100 km = 62.137 mi.

What is the formula for converting Celsius to Fahrenheit?

F = C * 9/5 + 32, or equivalently F = C * 1.8 + 32. Key reference points: 0C = 32F (freezing), 100C = 212F (boiling), 37C = 98.6F (body temp), -40C = -40F (equal point). Reverse: C = (F - 32) * 5/9.

How do I convert between different pressure units?

The key cross-reference: 1 atm = 101,325 Pa = 1.01325 bar = 760 mmHg = 14.696 psi. For tire pressure: multiply psi by 6.89476 to get kPa (35 psi = 241.3 kPa). For blood pressure: mmHg is standard (120/80 mmHg = 16.0/10.7 kPa).

What energy unit conversions are most commonly needed in engineering?

1 calorie = 4.184 joules, 1 kilowatt-hour = 3,600,000 J = 3.6 MJ = 860 kcal, 1 BTU = 1,055.06 J. For physics: 1 eV = 1.602e-19 J, with room temperature thermal energy kT = 25.7 meV at 298K.

How do I convert dynamic viscosity between Pa*s and centipoise?

1 Pa*s = 1000 centipoise (cP), or 1 cP = 0.001 Pa*s = 1 mPa*s. Reference values: water at 20C is 1.002 cP, honey ranges from 2000 to 10000 cP, and air is 0.018 cP. Centipoise is the more commonly used unit in industrial applications.

What thermal conductivity values are provided for common engineering materials?

The reference includes: copper at 401 W/(m*K), aluminum at 237 W/(m*K), stainless steel at 16 W/(m*K), and water at 25C at 0.607 W/(m*K). The conversion factor is 1 W/(m*K) = 0.5779 BTU/(h*ft*F).

How do I convert torque units and what are typical bolt torque values?

1 N*m = 0.7376 lbf*ft, or 1 lbf*ft = 1.3558 N*m. For reference, an M10 bolt typically requires 25-30 N*m (18.4-22.1 lbf*ft) of torque. Multiply N*m by 0.7376 to get lbf*ft.

What stress unit conversions and material yield strengths are included?

1 MPa = 0.145038 ksi, 1 ksi = 6.89476 MPa. Material reference: mild steel yields at 250 MPa (36.3 ksi), aluminum 6061-T6 at 276 MPa (40 ksi), and titanium Ti-6Al-4V at 880 MPa (127.6 ksi). These are commonly needed for structural engineering calculations.