ONE FORMULA, ONE ANSWER
Cavitation Number Calculator
Calculate a cavitation index by dividing the margin between reference absolute pressure and saturation vapor pressure by dynamic pressure. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Cavitation number σc
Enter values and select Calculate.
σc = (pabs − pv) / (ρV²/2)
Assumptions
Required: absolute pressure, vapor pressure for the liquid temperature, and a single-phase reference liquid with reference pressure at least vapor pressure. Onset depends on geometry, roughness, nuclei and reference location. Excluded: declaring cavitation onset or absence from this index alone.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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