Hydraulic Annulus Fluid Volume
Use this hydraulic annulus fluid volume tool when you have measured values for bore mm, rod mm, stroke mm. It applies a transparent mathematical relationship to those values to return an answer in L. Unlike a prediction or recommendation, this is a calculation from your inputs. Uses rod-side annular volume and full stroke. Enter a different scenario to see how this particular quantity changes; check the assumptions before using it in a project.
How to use this calculator
- Use exact measurements and consistent units for bore mm, rod mm, stroke mm.
- Enter each quantity; blank, nonnumeric and out-of-range inputs are not accepted.
- Compare the reported L quantity against your own data and the limitations below.
Formula for Hydraulic Annulus Fluid Volume
L = π*(bore_mm*bore_mm-rod_mm*rod_mm)*stroke_mm/4000000. Inputs are expressed in the units shown by the labels.
- This uses a direct fluid relationship and does not retrieve remote data, forecasts or individual account information.
- Uses rod-side annular volume and full stroke.
Worked examples
Worked example — Hydraulic Annulus Fluid Volume
Enter Bore mm = 63, Rod mm = 28, Stroke mm = 420.
Apply π*(bore_mm*bore_mm-rod_mm*rod_mm)*stroke_mm/4000000.
Calculated value: approximately 1.050627 L.
Understanding the result
The example produces about 1.050627 L; this is a mathematical output for the example inputs, not an observed result for your project.
Uses rod-side annular volume and full stroke.
Important notes
Uses rod-side annular volume and full stroke.
Use values from the same measurement period or physical system. The result is in L and is not a guarantee of capacity, safety, ranking or revenue.
Frequently asked questions
What does Hydraulic Annulus Fluid Volume calculate?
It converts bore mm, rod mm, stroke mm into a quantity measured in L using the stated formula.
Which assumption matters most?
Uses rod-side annular volume and full stroke.
How can I check this output?
Recalculate the worked example from the input quantities, confirm units and compare with direct measurements where available. This calculator does not fetch live data.
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Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.