Case 1
- Cross-sectional area A
- 0.01m²
- Flow velocity v
- 2m/s
0.020000m³/s
Open with these valuesVolumetric Flow Rate Calculator
0.020000m³/s
Result: 0.020000 m³/sFlow rate is area times velocity: Q = A × v. A 0.01 m² pipe with water at 2 m/s carries 0.02 m³/s — that is 20 litres per second, because one cubic metre is 1000 litres. Multiply the answer by 60 000 for litres per minute.
The numbers at a glance
Held fixed: Cross-sectional area A 0.010000 m².
| Flow velocity v (m/s) | Result (m³/s) |
|---|---|
| 0.000000 | 0.000000 |
| 0.500000 | 0.005000 |
| 1.000000 | 0.010000 |
| 1.500000 | 0.015000 |
| 2.000000Your value | 0.020000 |
| 2.500000 | 0.025000 |
| 3.000000 | 0.030000 |
| 3.500000 | 0.035000 |
| 4.000000 | 0.040000 |
Worked examples
Case 2
- Cross-sectional area A
- 0.5m²
- Flow velocity v
- 4m/s
2.000000m³/s
Open with these valuesCase 3
- Cross-sectional area A
- 0.07854m²
- Flow velocity v
- 1.5m/s
0.117810m³/s
Open with these valuesHow it's calculated
Q = A × v
- StepWork out the area the fluid flows through — for a round pipe, π × radius².
- StepEnter the average speed of the fluid along the pipe.
- ResultRead the flow in cubic metres per second; × 1000 gives litres per second.
Reference table
| A, v | Same flow in litres | Q (m³/s) |
|---|---|---|
| 0.01, 2 | 20 L/s | 0.02 |
| 1, 1 | 1000 L/s | 1 |
| 0.5, 4 | 2000 L/s | 2 |
| 0.0025, 3 | 7.5 L/s | 0.0075 |
| 0.07854, 1.5 | 117.81 L/s | 0.11781 |
| 0.01, 0 | no flow | 0 |
Questions
How do I calculate volumetric flow rate?
Multiply the cross-sectional area by the flow velocity: Q = A × v. Square metres and metres per second give the flow in cubic metres per second — a 0.01 m² pipe at 2 m/s carries 0.02 m³/s.
What is volumetric flow rate?
It is the volume of fluid that passes a given point each second, measured in cubic metres per second. It tells you how much liquid or gas moves through a pipe, duct or channel over time, which is the figure that sizes pumps and ventilation.
How do I find the cross-sectional area of a pipe?
For a round pipe the area is π × radius². Take the inside diameter, halve it to get the radius in metres, square it and multiply by π. A pipe of 0.1 m diameter has an area of about 0.00785 m².
How do I convert m³/s to litres per second?
Multiply by 1000, because one cubic metre is 1000 litres. So 0.02 m³/s is 20 litres per second, and 1.2 litres per minute would be 0.00002 m³/s.
What is the difference between volumetric and mass flow rate?
Volumetric flow rate measures the volume per second, mass flow rate the mass per second. Multiply the volumetric flow rate by the fluid density to get the mass flow rate; the two only match numerically when the density is 1 kg/m³.
Sources and last check
Information, not professional advice.