Compressed Air Leak Flow Calculator

Air loss through a leak hole at line pressure (choked-orifice model).

Equivalent hole diameter (mm)Line pressure (gauge) (kPa(g))

Leak rate (SCFM)

Leak rate (L/s FAD)

A single 3 mm hole at 7 bar leaks ~11 L/s ≈ 23 SCFM — roughly ₹1.5–2 lakh of electricity per year running 24/7.

Formula

ṁ = C_d·A·P₀·√(γ/RT)·(2/(γ+1))^((γ+1)/(2(γ−1))) — choked flow

References: US DOE Compressed Air Tip Sheet #3 — leaks

Compressed Air Leak Flow Calculator is a free air leak flow for process, mechanical and water engineers — 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 Compressed Air Leak Flow Calculator

Air loss through a leak hole at line pressure (choked-orifice model). The calculation implements ṁ = C_d·A·P₀·√(γ/RT)·(2/(γ+1))^((γ+1)/(2(γ−1))) — choked flow (US DOE Compressed Air Tip Sheet #3 — leaks). A single 3 mm hole at 7 bar leaks ~11 L/s ≈ 23 SCFM — roughly ₹1.5–2 lakh of electricity per year running 24/7.

How to use Compressed Air Leak Flow Calculator

1Enter Equivalent hole diameter in mm.
2Enter Line pressure (gauge) in kPa(g).
3Read Leak rate, Leak rate instantly — no submit button needed.
4Need US units? Flip the SI/Imperial toggle and every field converts.

Why use Compressed Air Leak Flow Calculator?

✓Implements the standard formula — ṁ = C_d·A·P₀·√(γ/RT)·(2/(γ+1))^((γ+1)/(2(γ−1))) — choked flow
✓Reference cited on-page: US DOE Compressed Air Tip Sheet #3 — leaks
✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
✓Runs entirely in your browser — nothing uploaded, free forever

Frequently asked questions

What formula does the Compressed Air Leak Flow Calculator use?+

It computes ṁ = C_d·A·P₀·√(γ/RT)·(2/(γ+1))^((γ+1)/(2(γ−1))) — choked flow, per US DOE Compressed Air Tip Sheet #3 — leaks. The formula is displayed under the result.

What should I keep in mind when using this calculator?+

A single 3 mm hole at 7 bar leaks ~11 L/s ≈ 23 SCFM — roughly ₹1.5–2 lakh of electricity per year running 24/7.

Does this work for any fluid?+

Yes — 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 Compressed Air Leak Flow Calculator free to use?+

Yes — 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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