MEASUREMENTS AND PURCHASE DECISIONS
Convert horizontal tank depth to volume.
Why is liquid depth not proportional to volume in a horizontal cylinder?
Use the matching calculator
Use this decision sequence
- Use the internal diameter and straight tank length.
- Measure liquid depth vertically from the lowest point.
- Check that depth lies between zero and the internal diameter.
- Use circular-segment geometry; treat domed ends or a tilted tank separately.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Vertical-sided box | Volume increases linearly with depth. |
| Horizontal cylinder | Segment area changes nonlinearly with depth. |
| Half diameter depth | Is half capacity for a symmetric flat-ended cylinder. |
Worked comparison
A horizontal flat-ended cylinder 2 m in diameter and 4 m long has capacity 4π m³. At 1 m depth, its liquid volume is 2π m³. At other depths, a simple depth-to-diameter fraction does not give the volume fraction.
Check before using the estimate
Internal fittings and domed end volumes are excluded from this cylindrical model.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.