Engineering Unit Converter: Temperature, Pressure, Torque, Stress and More
Convert the units engineers, inspectors and buyers use every day: °F and °C, psi, bar and MPa, ft-lb and N·m, ksi and MPa, plus force, length, flow, density, energy, cutting speed, thermal expansion, fractions and thread pitch. Enter a value once and see it in every unit at the same time.
Popular conversions
Conversion formulas
The converter uses exact definitions where they exist (1 in = 25.4 mm, 1 lb = 0.45359237 kg, standard gravity 9.80665 m/s²). Every other factor is derived from those.
Quick reference charts
Printable values for the conversions searched most often in bolting, piping and machining work. Pressure and torque values are rounded to four significant figures.
Fahrenheit to Celsius
| °F | °C |
|---|---|
| -320 °F | -195.6 °C |
| -150 °F | -101.1 °C |
| -50 °F | -45.6 °C |
| -20 °F | -28.9 °C |
| 0 °F | -17.8 °C |
| 32 °F | 0.0 °C |
| 70 °F | 21.1 °C |
| 100 °F | 37.8 °C |
| 212 °F | 100.0 °C |
| 300 °F | 148.9 °C |
| 400 °F | 204.4 °C |
| 500 °F | 260.0 °C |
| 650 °F | 343.3 °C |
| 750 °F | 398.9 °C |
| 800 °F | 426.7 °C |
| 900 °F | 482.2 °C |
| 1,000 °F | 537.8 °C |
| 1,100 °F | 593.3 °C |
| 1,200 °F | 648.9 °C |
| 1,500 °F | 815.6 °C |
Celsius to Fahrenheit
| °C | °F |
|---|---|
| -196 °C | -321 °F |
| -101 °C | -150 °F |
| -46 °C | -51 °F |
| -29 °C | -20 °F |
| 0 °C | 32 °F |
| 20 °C | 68 °F |
| 100 °C | 212 °F |
| 150 °C | 302 °F |
| 200 °C | 392 °F |
| 250 °C | 482 °F |
| 300 °C | 572 °F |
| 350 °C | 662 °F |
| 400 °C | 752 °F |
| 450 °C | 842 °F |
| 500 °C | 932 °F |
| 540 °C | 1,004 °F |
| 600 °C | 1,112 °F |
| 650 °C | 1,202 °F |
| 700 °C | 1,292 °F |
| 815 °C | 1,499 °F |
Strength: ksi to MPa
| ksi | MPa |
|---|---|
| 30 ksi | 207 MPa |
| 36 ksi | 248 MPa |
| 50 ksi | 345 MPa |
| 55 ksi | 379 MPa |
| 58 ksi | 400 MPa |
| 60 ksi | 414 MPa |
| 75 ksi | 517 MPa |
| 80 ksi | 552 MPa |
| 90 ksi | 621 MPa |
| 92 ksi | 634 MPa |
| 95 ksi | 655 MPa |
| 100 ksi | 689 MPa |
| 105 ksi | 724 MPa |
| 115 ksi | 793 MPa |
| 120 ksi | 827 MPa |
| 125 ksi | 862 MPa |
| 130 ksi | 896 MPa |
| 150 ksi | 1,034 MPa |
| 170 ksi | 1,172 MPa |
| 200 ksi | 1,379 MPa |
Torque: ft-lb to in-lb and N·m
| ft·lbf | in·lbf | N·m |
|---|---|---|
| 5 ft·lbf | 60 in·lbf | 6.779 N·m |
| 10 ft·lbf | 120 in·lbf | 13.56 N·m |
| 20 ft·lbf | 240 in·lbf | 27.12 N·m |
| 25 ft·lbf | 300 in·lbf | 33.90 N·m |
| 50 ft·lbf | 600 in·lbf | 67.79 N·m |
| 75 ft·lbf | 900 in·lbf | 101.7 N·m |
| 100 ft·lbf | 1,200 in·lbf | 135.6 N·m |
| 150 ft·lbf | 1,800 in·lbf | 203.4 N·m |
| 200 ft·lbf | 2,400 in·lbf | 271.2 N·m |
| 250 ft·lbf | 3,000 in·lbf | 339.0 N·m |
| 300 ft·lbf | 3,600 in·lbf | 406.7 N·m |
| 400 ft·lbf | 4,800 in·lbf | 542.3 N·m |
| 500 ft·lbf | 6,000 in·lbf | 677.9 N·m |
| 750 ft·lbf | 9,000 in·lbf | 1,017 N·m |
| 1,000 ft·lbf | 12,000 in·lbf | 1,356 N·m |
| 1,500 ft·lbf | 18,000 in·lbf | 2,034 N·m |
| 2,000 ft·lbf | 24,000 in·lbf | 2,712 N·m |
| 3,000 ft·lbf | 36,000 in·lbf | 4,067 N·m |
| 5,000 ft·lbf | 60,000 in·lbf | 6,779 N·m |
| 10,000 ft·lbf | 120,000 in·lbf | 13,558 N·m |
Torque: N·m to ft-lb and in-lb
| N·m | ft·lbf | in·lbf |
|---|---|---|
| 10 N·m | 7.376 ft·lbf | 88.51 in·lbf |
| 25 N·m | 18.44 ft·lbf | 221.3 in·lbf |
| 50 N·m | 36.88 ft·lbf | 442.5 in·lbf |
| 100 N·m | 73.76 ft·lbf | 885.1 in·lbf |
| 200 N·m | 147.5 ft·lbf | 1,770 in·lbf |
| 300 N·m | 221.3 ft·lbf | 2,655 in·lbf |
| 500 N·m | 368.8 ft·lbf | 4,425 in·lbf |
| 1,000 N·m | 737.6 ft·lbf | 8,851 in·lbf |
| 2,000 N·m | 1,475 ft·lbf | 17,701 in·lbf |
| 5,000 N·m | 3,688 ft·lbf | 44,254 in·lbf |
Fraction to decimal and mm
| Fraction | Decimal | mm |
|---|---|---|
| 1/16″ | 0.0625 in | 1.5875 mm |
| 1/8″ | 0.1250 in | 3.1750 mm |
| 3/16″ | 0.1875 in | 4.7625 mm |
| 1/4″ | 0.2500 in | 6.3500 mm |
| 5/16″ | 0.3125 in | 7.9375 mm |
| 3/8″ | 0.3750 in | 9.5250 mm |
| 7/16″ | 0.4375 in | 11.1125 mm |
| 1/2″ | 0.5000 in | 12.7000 mm |
| 9/16″ | 0.5625 in | 14.2875 mm |
| 5/8″ | 0.6250 in | 15.8750 mm |
| 11/16″ | 0.6875 in | 17.4625 mm |
| 3/4″ | 0.7500 in | 19.0500 mm |
| 13/16″ | 0.8125 in | 20.6375 mm |
| 7/8″ | 0.8750 in | 22.2250 mm |
| 15/16″ | 0.9375 in | 23.8125 mm |
| 1″ | 1.0000 in | 25.4000 mm |
Pressure: psi to bar, kPa and MPa
| psi | bar | kPa | MPa |
|---|---|---|---|
| 1 psi | 0.06895 bar | 6.895 kPa | 0.006895 MPa |
| 5 psi | 0.3447 bar | 34.47 kPa | 0.03447 MPa |
| 10 psi | 0.6895 bar | 68.95 kPa | 0.06895 MPa |
| 14.696 psi | 1.013 bar | 101.3 kPa | 0.1013 MPa |
| 25 psi | 1.724 bar | 172.4 kPa | 0.1724 MPa |
| 50 psi | 3.447 bar | 344.7 kPa | 0.3447 MPa |
| 100 psi | 6.895 bar | 689.5 kPa | 0.6895 MPa |
| 150 psi | 10.34 bar | 1,034 kPa | 1.034 MPa |
| 200 psi | 13.79 bar | 1,379 kPa | 1.379 MPa |
| 250 psi | 17.24 bar | 1,724 kPa | 1.724 MPa |
| 300 psi | 20.68 bar | 2,068 kPa | 2.068 MPa |
| 500 psi | 34.47 bar | 3,447 kPa | 3.447 MPa |
| 740 psi | 51.02 bar | 5,102 kPa | 5.102 MPa |
| 1,000 psi | 68.95 bar | 6,895 kPa | 6.895 MPa |
| 1,500 psi | 103.4 bar | 10,342 kPa | 10.34 MPa |
| 2,000 psi | 137.9 bar | 13,790 kPa | 13.79 MPa |
| 2,500 psi | 172.4 bar | 17,237 kPa | 17.24 MPa |
| 3,000 psi | 206.8 bar | 20,684 kPa | 20.68 MPa |
| 5,000 psi | 344.7 bar | 34,474 kPa | 34.47 MPa |
| 10,000 psi | 689.5 bar | 68,948 kPa | 68.95 MPa |
| 15,000 psi | 1,034 bar | 103,421 kPa | 103.4 MPa |
| 20,000 psi | 1,379 bar | 137,895 kPa | 137.9 MPa |
Frequently asked questions
How do you convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. For example, 212 °F minus 32 is 180, and 180 × 5/9 is 100 °C. To go the other way, multiply the Celsius temperature by 9/5 and add 32.
How many psi are in one bar?
One bar equals 14.5038 psi, and one psi equals 0.0689476 bar. A bar is exactly 100 kPa, slightly less than one standard atmosphere (14.696 psi).
How do you convert ft-lb to N·m?
Multiply foot-pounds by 1.355818 to get newton-meters. For example, 100 ft·lbf is 135.6 N·m. To convert N·m to ft-lb, multiply by 0.737562.
How do you convert in-lb to ft-lb?
Divide inch-pounds by 12. There are 12 in·lbf in one ft·lbf, so 600 in·lbf is 50 ft·lbf.
How do you convert ksi to MPa?
Multiply ksi by 6.894757 to get MPa. For example, ASTM A193 Grade B7 has a minimum tensile strength of 125 ksi, which is about 862 MPa. One MPa is the same as one N/mm².
Is a ft-lb of torque the same as a ft-lb of energy?
They have the same units but describe different things. Torque is a twisting moment (force times lever arm), while energy or work is force times the distance moved. Charpy impact results are energies and are usually reported in ft·lbf or joules; tightening values are torques in ft·lbf or N·m.
What is the difference between psig and psia?
psig is gauge pressure, measured relative to the surrounding atmosphere, and psia is absolute pressure, measured from a perfect vacuum. At sea level, psia equals psig plus about 14.7 psi. The unit conversion factors are the same for both.
How do I convert threads per inch to a metric pitch?
Divide 25.4 by the threads per inch. For example, 8 TPI is a pitch of 3.175 mm. Some inch and metric pitches are close, such as 20 TPI (1.27 mm) and 1.25 mm, but the threads are not interchangeable.
How do I convert a fraction of an inch to millimeters?
Convert the fraction to a decimal by dividing the top number by the bottom number, then multiply by 25.4. For example, 3/8 inch is 0.375 inch, which is 9.525 mm. The converter also accepts mixed fractions such as 1-3/8.
How accurate is this unit converter?
The conversion factors use exact definitions where they exist, such as 1 inch = 25.4 mm and 1 lb = 0.45359237 kg, with results shown to the number of significant figures you choose. Round the result to suit the precision of the original measurement.
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