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Cv / Kv Converter
Type a value in either box — the other updates instantly.
Formula
Kv = 0.865 × Cv | Cv = 1.156 × Kv
Definitions
| Factor | Definition |
|---|---|
| Kv | Flow (m³/h) of water at 20 °C that drops 1 bar across the valve |
| Cv | Flow (US gal/min) of water at 60 °F that drops 1 psi across the valve |
Quick Reference
| Kv | Cv |
|---|---|
| 1 | 1.16 |
| 4 | 4.62 |
| 10 | 11.56 |
| 16 | 18.50 |
| 25 | 28.90 |
| 40 | 46.24 |
| 63 | 72.83 |
| 100 | 115.61 |
FAQ
Which is bigger, Cv or Kv?
Cv — the same valve has a Cv number about 16% higher than its Kv number.
How do I size a valve?
Compute the required Kv from your flow and pressure drop, then choose a valve whose Kv at your travel is comfortably above it (typically 20–80% open).