Kv ↔ Cv Converter
Convert between metric Kv (m³/h @ 1 bar) and US Cv (gpm @ 1 psi) plus equivalent K-factor.
Kv and Cv differ only in units (m³/h·bar vs gpm·psi). The K-factor form lets you drop a valve into a Darcy minor-loss sum.
Formula
Kv ↔ Cv Converter is a free kv to cv for pump engineers, plumbers and plant designers — 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 Kv ↔ Cv Converter
Convert between metric Kv (m³/h @ 1 bar) and US Cv (gpm @ 1 psi) plus equivalent K-factor. The calculation implements Cv = Kv / 0.865; K = 1.6×10⁹·d⁴ / Kv² (d in metres) (IEC 60534 / ISA-75.01.01). Kv and Cv differ only in units (m³/h·bar vs gpm·psi). The K-factor form lets you drop a valve into a Darcy minor-loss sum.
How to use Kv ↔ Cv Converter
- 1Enter Kv (metric) in m³/h/√bar.
- 2Enter Valve nominal bore (for K) in mm.
- 3Read Cv (US), Equivalent K-factor instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Kv ↔ Cv Converter?
- ✓Implements the standard formula — Cv = Kv / 0.865; K = 1.6×10⁹·d⁴ / Kv² (d in metres)
- ✓Reference cited on-page: IEC 60534 / ISA-75.01.01
- ✓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 Kv ↔ Cv Converter use?+
It computes Cv = Kv / 0.865; K = 1.6×10⁹·d⁴ / Kv² (d in metres), per IEC 60534 / ISA-75.01.01. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Kv and Cv differ only in units (m³/h·bar vs gpm·psi). The K-factor form lets you drop a valve into a Darcy minor-loss sum.
Can I use this for pump selection?+
Use it to establish the duty (flow, head, NPSH, power) and then pick a pump whose curve passes through that point near best efficiency. The tool gives you the engineering numbers a supplier will ask for.
Is the Kv ↔ Cv Converter 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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