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Unit converter for maintenance: pressure, torque, power, flow
Convert bar to psi, N·m to lbf·ft, kW to hp, m³/h to US gpm, °C to °F and vibration peak to RMS, as found on nameplates. Free, no sign-up.
- Instant result
- Formula and standards shown
- On desktop and phone
Result
87.02psiResult
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How do you convert bar to psi?
Multiply the value in bar by 14.504. One bar is exactly 100,000 pascals, and NIST Special Publication 811 gives one psi (pound-force per square inch) as 6,894.757 Pa: 100,000 / 6,894.757 = 14.5038. To go back from psi to bar, divide by the same factor, or multiply by 0.068948.
On the shop floor, the factor itself is rarely what goes wrong. A gauge reads against the atmosphere, so 6 bar on a compressed air line means 6 bar gauge, about 87 psig, and not 87 psia. Manuals from American suppliers also give torque in lbf·ft, pump flow in US gallons per minute and motor power in hp, sometimes next to SI values on the same page. Converting once, with the factor written into the work order, saves the next shift from doing it again.
Gauge or absolute pressure
psig and barg are read against atmospheric pressure, psia and bara against a vacuum. The standard atmosphere is 1.01325 bar, or 14.696 psi: add it to go from gauge to absolute.
Torque: lbf·ft to N·m
1 lbf·ft = 1.355818 N·m (NIST SP 811). A torque of 50 lbf·ft written in an American manual is therefore about 67.8 N·m on a metric wrench.
Power: hp to kW
The horsepower of the NIST tables is 550 ft·lbf/s, or 745.70 W. The metric horsepower found on some European nameplates (ch, PS, CV) is a slightly smaller unit: check which one the plate uses.
Flow: US gpm to m³/h
One US gallon is 3.785412 litres, so 1 US gpm equals 0.2271 m³/h. The imperial gallon used in the UK is larger, and mixing the two on a pump curve shifts the duty point.
Reference documents : NIST SP 811, Appendix B.9 (conversion factors) ; BIPM, The International System of Units (SI Brochure)
Converted values written into the work order
Here, the calculator is free and the result is gone when you close the page. In Reglova, it is attached to the work order on the right machine: you find it again at the next breakdown, and on audit day.
The CMMS software comparison, our gaps included- Attached to the work order with its inputs: the server recalculates it, it stays verifiable.
- On the technician's phone, even without a network.
- In the machine's history, for the next breakdown.
When to convert maintenance units
01
Read a European manual's torque in lbf·ft.
02
Convert a gauge reading from bar to psi.
03
Convert a peak vibration velocity to RMS for a sinusoidal signal.
Good to know
Peak and RMS only convert by a fixed factor for a sinusoidal signal: on a real vibration measurement, use the RMS value given by the instrument.
Unit conversion factors (BIPM, NIST)
Nameplates and manuals mix units: psi and bar, lbf·ft and N·m, hp and kW, US gallons and m³/h. The converter covers pressure, torque, force, power, flow, length, mass, temperature, viscosity and vibration velocity, with BIPM and NIST factors.
Formula · Reference documents
y = (x·a + b − b′)/a′
BIPM, SI ; NIST SP 811 (conversion factors)
Inputs and accepted ranges
| Input | Unit | Accepted range | Example |
|---|---|---|---|
| Value | -1,000,000,000,000 to 1,000,000,000,000 | 6 | |
| From | 44 options | bar | |
| To | 44 options | psi |
Calculated results
- Result
What the calculator flags
- Peak and RMS convert this way only for a sine wave.
Nameplate data kept with each asset
- Breakdowns reported by QR code
- Work orders on the phone, even without a network
- Mandatory inspections reminded by email
- Audit file as a PDF, in one click
Free during the beta, no credit card