ONE FORMULA, ONE ANSWER
Volume Flow Rate Calculator
Check flow through a pipe or ventilation opening using its cross-sectional area. 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
Volume flow rate Q
Enter values and select Calculate.
Q = A V
Assumptions
Use A>0 and the cross-sectional mean normal velocity. A point measurement of maximum speed is not a mean velocity. Selecting L/min changes only the display unit of the same flow rate.
Displayed values are floating-point approximations. Measurement uncertainty and design safety factors 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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