Engineering Unit Converter
A single converter for the quantities that come up across mechanical, civil, and process engineering — pressure, force, torque, energy, frequency, area, volume, velocity, acceleration, and density. Choose a category, then convert.
Conversion reference
| From | To | Result |
|---|---|---|
| 1 bar | Pascal (Pa) | 100000 Pa |
| 1 bar | Pound per square inch (psi) | 14.503773773 psi |
| 1 bar | Atmosphere (standard) (atm) | 0.986923266716 atm |
| 1 atm | Pascal (Pa) | 101325 Pa |
| 1 atm | Pound per square inch (psi) | 14.6959487755 psi |
| 1 atm | Torr (Torr) | 760 Torr |
| 1 lbf | Newton (N) | 4.44822161526 N |
| 1 lbf·ft | Newton-meter (N·m) | 1.35581794833 N·m |
| 1 kWh | Megajoule (MJ) | 3.6 MJ |
| 1 kWh | British thermal unit (IT) (BTU) | 3412.14163313 BTU |
| 1 gal (US) | Liter (L) | 3.785411784 L |
Values are generated by the converter engine, at Auto precision.
About this converter
Each category has a coherent SI base unit — pascal, newton, newton-metre, joule, hertz, square metre, cubic metre, metre per second, metre per second squared, kilogram per cubic metre — and every other unit is a multiple of it. The converter expresses your value in the base unit and then in the target unit.
Categories are kept apart deliberately: torque and energy share units dimensionally but are different quantities, and mixing area with volume or pressure with force would make the lists unusable.
How to use it
- Choose a category (Pressure, Force, Torque, Energy, and so on).
- Type the value you want to convert.
- Pick the from and to units — these lists change with the category.
- Read the result, Copy it, or Swap the direction. The reference table below updates with the category.
The result updates as you type — there is no Calculate button. Use Swap to reverse the two units, and Reset to return to the defaults.
Key factors
- Pressure: 1 bar = 100000 Pa · 1 atm = 101325 Pa · 1 psi = 6894.7572932 Pa · 1 torr = 101325/760 Pa
- Force: 1 lbf = 4.4482216153 N · 1 kgf = 9.80665 N · 1 dyne = 1e−5 N
- Torque: 1 lbf·ft = 1.3558179483 N·m · 1 kgf·m = 9.80665 N·m
- Energy: 1 cal = 4.184 J · 1 kcal = 4184 J · 1 BTU = 1055.0558526 J · 1 kWh = 3.6 MJ
- Volume: 1 L = 0.001 m³ · 1 US gallon = 3.785411784 L
- Velocity: 1 km/h = 1/3.6 m/s · 1 mph = 0.44704 m/s · 1 knot = 1852/3600 m/s
- Acceleration: standard gravity g₀ = 9.80665 m/s²
- Density: 1 g/cm³ = 1000 kg/m³
FAQ
Which categories does this converter cover?
Pressure, force, torque, energy, frequency, area, volume, velocity, acceleration, and density. Pick a category and the from/to lists update to that category’s units.
What is 1 bar in psi?
1 bar = 100,000 Pa ≈ 14.5037738 psi. 1 standard atmosphere = 101,325 Pa ≈ 14.6959488 psi ≈ 1.01325 bar.
How is torque different from energy if both can be newton-metres?
They have the same base units but are different physical quantities, so this tool keeps them in separate categories. Torque (N·m) is a twisting moment; energy (J) is work done. A pound-force foot of torque converts to about 1.3558 N·m.
Which BTU and calorie are used?
The International Table BTU (1 BTU = 1055.05585262 J) and the thermochemical calorie (1 cal = 4.184 J, so 1 kcal = 4184 J).
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