Open the Engineering Unit Converter with Unit
Convert engineering units and compound unit expressions — psi to MPa, lbf·ft to N·m, ksi to GPa, kg·m²/s² to J — with SI prefixes.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
What is the Engineering Unit Converter with Unit?
Most unit converters only handle a fixed list of single units, which is no help when your quantity is lbf·ft, kgf/cm², BTU/h or kg·m²/s². This converter understands unit expressions: type any combination of units with multiplication (a star or a space), division, exponents and parentheses — for example lbf*ft, N/mm^2, W/(m*K), ft^3/min or m/s^2 — and convert it to any other expression of the same dimension. SI prefixes (µ, m, k, M, G…) work on SI units, so kPa, MPa, GPa, mm, µm, kN, kW and MJ are all recognised, along with the imperial and US customary units engineers use (in, ft, lb, lbf, kip, psi, ksi, hp, BTU, gal, cfm and many more).
Every conversion is checked by dimensional analysis: the tool computes the SI dimension of each side and refuses to convert incompatible quantities such as metres to seconds, naming the dimension of each. It also tells you what kind of quantity you are converting (force, pressure/stress, energy/torque, power, flow and so on) and the exact factor, using the NIST conversion constants — 1 psi = 6894.757293168 Pa, 1 lbf = 4.4482216152605 N, 1 hp = 745.69987158227 W. Temperatures (°C, °F, K) are handled on their own scale.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Multiply, divide, exponents and parentheses — lbf*ft, W/(m*K), ft^3/min.
Refuses incompatible conversions and shows the SI dimension.
µ, m, k, M, G… on SI units: MPa, kN, µm, GW.
Exact standard factors with the factor shown.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This engineering calculator | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Which units are supported?
Metric and US customary units for length, mass, time, force, pressure, energy, power, volume, flow, electrical and more — see the list on the page.
Can it convert temperature?
Yes, °C, °F and K on a single unit.
Why did it refuse my conversion?
The two sides have different dimensions, so no factor exists.
Is it free?
Yes.
How do I use the Engineering Unit Converter with Unit?
1. Enter a value and the unit expression to convert from. 2. Enter the unit expression to convert to. 3. Read the result, the factor and the quantity type. 4. Use the swap button or the common-conversion chips.
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Try the Engineering Unit Converter with Unit now
Convert any engineering unit or compound expression (lbf*ft to N*m, psi to MPa, kg*m/s^2. Free to use.
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