Home & Construction
Pipe Volume & Fill Time Calculator
Updated Aug 25, 2026 Reviewed Aug 25, 2026
Calculate full-pipe capacity and liquid weight, then solve ideal fill time, required flow and average velocity across multiple segment groups.
Full-pipe geometry and ideal flow
Enter actual inside diameters, lengths and flow scenario
Result
Calculation summary
Enter values to see the result
Your result, breakdown, assumptions, and warnings will appear here.
System preview
Pipe capacity and ideal transfer
System volume
65.28 US gal
Ideal fill time
6.53 min
Calculation mode
Calculate fill time from flow
How to use this calculator
- 1Add each actual inside diameter and length.
- 2Choose volume only, time from flow or flow from time.
- 3Enter liquid density for weight.
- 4Choose display units.
Formula
Volume = πr²L; time = volume ÷ flow; velocity = flow ÷ area
Volumes are summed; parallel-group velocity assumes equal flow splitting.
Calculation steps
- Convert inside diameter and length.
- Calculate cylinder volume.
- Sum volume and liquid weight.
- Solve time or flow.
- Calculate ideal velocity when flow is available.
Worked example
A full 10 m pipe with 100 mm inside diameter holds about 78.54 L.
Assumptions
- Use actual inside diameter.
- Pipes are completely full.
- Parallel flow divides equally.
- Pressure loss and pump curves are excluded.
- Liquid density is constant.
Sources
Frequently asked questions
Should I enter nominal size?
No. Enter actual inside diameter.
Can it combine diameters?
Yes. Add each as a segment group.
How are parallel pipes handled?
Volume uses quantity and velocity assumes equal flow division.
Does it include pressure loss?
No. It is an ideal geometry and flow conversion.
Can it calculate fill time?
Yes. Enter system flow and select fill time from flow.
Can it calculate required flow?
Yes. Enter a target time and select required flow from time.
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