Calculate volumetric flow, mass flow, pipe flow from diameter and velocity, and fill/drain time. Convert between common units and export results to CSV.
Q = V/tQ = A·vṁ = ρ·QUnit Converter
Flow Rate (Volumetric & Mass) + Pipe Flow
Choose a mode: volume/time, pipe area/velocity, density-based mass flow, or fill/drain time. Includes accurate unit conversion.
Flow Rate (Q)
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Flow (SI)
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Equation Used
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Interpretation
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Common Conversions
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Inputs
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Volumetric flow is Q = V/t. If you know pipe size and velocity, use the pipe tab (Q = A·v). For mass flow, use density (ṁ = ρ·Q).
Flow Rate (Q)
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Area (A)
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Flow (SI)
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Equation Used
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Common Conversions
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Interpretation
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Pipe flow is Q = A·v. For round pipes, A = πd²/4. This assumes steady, uniform average velocity and does not include pressure losses.
Mass Flow (ṁ)
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Mass Flow (SI)
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Equation Used
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Common Conversions
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Inputs
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Interpretation
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Mass flow is ṁ = ρ·Q. If density changes with temperature or pressure (gases), use an appropriate density for your conditions.
Result
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Equation Used
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SI Values
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Interpretation
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Fill/drain calculations assume steady flow. In real systems, flow can vary with head, pump curve, valve position, and pressure.
Converted Value
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SI (m³/s)
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Conversion Factor
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Interpretation
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Unit conversion is based on exact definitions (e.g., 1 US gallon = 0.003785411784 m³). Ensure you are using US gallons (not imperial) for GPM/GPH.
Value
From
To
SI (m³/s)
Notes
Range tables are useful for quick selection, reporting, and sanity checks. Export results to CSV for spreadsheets and documentation.
