Fluid Flow Rate Table: Flow rate by Pipe cross-section area
Reference table of flow rate for Fluid Flow Rate across a range of pipe cross-section area values — exact, engine-computed figures you can read off at a glance.
Fluid Flow Rate Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Flow rate
0.1000
- In litres per second
- 100.00
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Fluid Flow Rate Calculator
The Fluid Flow Rate Calculator works out your flow rate, along with 1 related figure in an instant. Enter pipe cross-section area and flow velocity and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the pipe cross-section area.
- Enter the flow velocity.
- Read off your flow rate, together with in litres per second — the calculator updates automatically, with no button to press.
Formula
The Fluid Flow Rate Calculator uses the formula:
Flow rate = Pipe cross-section area × Flow velocity
Worked example
For example, with pipe cross-section area of 0.05 m² and flow velocity of 2 m/s, the flow rate is 0.1000.
| Pipe cross-section area | 0.05 m² |
|---|---|
| Flow velocity | 2 m/s |
| Flow rate | 0.1000 |
|---|---|
| In litres per second | 100.00 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Velocity
- The speed of an object in a given direction.
- Area
- The amount of two-dimensional space a shape covers, measured in square units.
Frequently asked questions
Multiply cross-sectional area by velocity: Q = A × v. An area of 0.05 m² at 2 m/s gives 0.1 m³/s, or 100 litres per second.
It is the volume of fluid passing a point per second, measured in cubic metres or litres per second.
For incompressible flow, A × v is constant, so a narrower pipe means faster flow to carry the same rate.
For a round pipe, use π × radius². Enter that area to get the flow rate.
Enter the pipe cross-section area. Enter the flow velocity. Read off your flow rate, together with in litres per second — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Fluid Flow Rate: Formula, Steps & Examples
Learn how to calculate Fluid Flow Rate — the formula explained step by step, with worked examples and a free calculator to check your answer.