Hydraulic diameter calculator

Calculate hydraulic diameter with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use hydraulic diameter to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Cross-sectional area (m²)
0.02
Wetted perimeter (m)
0.6
Hydraulic diameter (m)
0.133333

Try another scenario

Cross-sectional area (m²)
0.022000000000000002
Wetted perimeter (m)
0.6
Hydraulic diameter (m)
0.146667
Calculation method

Calculation method

Hydraulic diameter (m)

Dh=4A/P.

Symbols and units
a
Cross-sectional area (m²)
b
Wetted perimeter (m)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Calculation uses the entered values and stated mathematical model; quantities must use the labelled units. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Dh=4A/P.
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