Shape
Container shape
Tapered round pot, Round cylinder, Rectangular planter
Pot Volume Calculator
Compare cylindrical, tapered round and rectangular containers.
Open this toolContainers with sloping sides hold a different volume from straight cylinders of similar height.
Choose the matching shape and measure the fill level you intend to use, not necessarily the full container height.
Inputs and controls
Top inside diameter
Container shape · cm
Allowed range: 0.1 to 1000
Bottom inside diameter
Container shape · cm
Allowed range: 0.1 to 1000
Inside length
Container shape · cm
Allowed range: 0.1 to 1000
Inside width
Container shape · cm
Allowed range: 0.1 to 1000
Inside height
Usable fill · cm
Allowed range: 0.1 to 1000
Unfilled space at top
Usable fill · cm
Allowed range: 0 to 999
Containers
Usable fill · pots
Allowed range: 1 to 10000
How to use
- Choose shape. Enter top inside diameter, bottom inside diameter, inside length and inside width.
- Enter inside height, unfilled space at top and containers.
- Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.
Why use this tool
Shape choices keep tapered pots from being treated as straight sided containers.
Before relying on the result
Tapered fill uses the diameter at the actual fill height. Soil displacement by existing roots is excluded.
Tool limitations
Tapered fill uses the diameter at the actual fill height. Soil displacement by existing roots is excluded.
Questions
Is existing root volume deducted?
No. Established roots and other displaced volume need a separate adjustment to the fill requirement.
What should I check before using Pot Volume Calculator?
Check Shape, Top inside diameter, Bottom inside diameter and Inside length. Use the exact units shown beside the controls and replace any example values with your own inputs.
Source page last modified: 2026-10-04T13:08:11+00:00. This profile describes the tool; use its page to run it.
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