Orifice Flow Calculator
Flow through a sharp-edged orifice from differential pressure, bore and discharge coefficient.
Cd โ 0.61 for a sharp-edged orifice with ฮฒ < 0.5; use the meter's calibrated coefficient for custody-transfer accuracy.
Formula
Orifice Flow Calculator is a free orifice flow for process, mechanical and water engineers โ instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Orifice Flow Calculator
Flow through a sharp-edged orifice from differential pressure, bore and discharge coefficient. The calculation implements Q = C_d ยท A ยท โ(2ยทฮP / ฯ) (ISO 5167-2 โ Orifice plates). Cd โ 0.61 for a sharp-edged orifice with ฮฒ < 0.5; use the meter's calibrated coefficient for custody-transfer accuracy.
How to use Orifice Flow Calculator
- 1Enter Discharge coefficient C_d (Sharp-edged orifice โ 0.61).
- 2Enter Orifice bore in mm.
- 3Enter Differential pressure ฮP in kPa.
- 4Enter Fluid density in kg/mยณ.
- 5Read Flow rate, Jet velocity instantly โ no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Orifice Flow Calculator?
- โImplements the standard formula โ Q = C_d ยท A ยท โ(2ยทฮP / ฯ)
- โReference cited on-page: ISO 5167-2 โ Orifice plates
- โOne-click SI โ Imperial toggle โ values convert in place, physics stays in SI
- โLive worked example: the substitution recomputes from your numbers
- โRuns entirely in your browser โ nothing uploaded, free forever
Frequently asked questions
What formula does the Orifice Flow Calculator use?+
It computes Q = C_d ยท A ยท โ(2ยทฮP / ฯ), per ISO 5167-2 โ Orifice plates. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
Cd โ 0.61 for a sharp-edged orifice with ฮฒ < 0.5; use the meter's calibrated coefficient for custody-transfer accuracy.
Does this work for any fluid?+
Yes โ density and viscosity are inputs (with common fluids suggested in the field hints), so the same physics applies to water, oils, gases and process fluids. Compute always runs in SI internally, so unit mix-ups can't corrupt the result.
Is the Orifice Flow Calculator free to use?+
Yes โ completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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