# Pot Volume Calculator

Compare cylindrical, tapered round and rectangular containers.

[Open this tool](https://whatson.pk/gardening-pot-volume-calculator/)

Category: Gardening

Containers 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

* Shape: Tapered round pot; Round cylinder; Rectangular planter
* Top inside diameter (cm). Allowed range: 0.1 to 1000
* Bottom inside diameter (cm). Allowed range: 0.1 to 1000
* Inside length (cm). Allowed range: 0.1 to 1000
* Inside width (cm). Allowed range: 0.1 to 1000
* Inside height (cm). Allowed range: 0.1 to 1000
* Unfilled space at top (cm). Allowed range: 0 to 999
* Containers (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 (UTC): 2026-10-04T13:08:11+00:00

This profile describes the tool. It does not execute it or supply a professional certification.