MEASURE ONCE. PLAN YOUR PURCHASE.

Tapered Pot Fill around Root Balls calculator.

Subtract supplied root-ball displacement from the selected tapered pot fill volume, then order mix bags.

LANDSCAPING

Your inputs

Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.

Loose mix volume per selected bag

yd³

Your material allowance

Where to get this value

Enter your own allowance. Presets are input shortcuts, not a construction recommendation.

Pot group 1

Inside diameter at chosen fill level

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Inside bottom diameter

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Chosen fill height

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Supplied root-ball displacement per pot

yd³

Identical pots

YOUR ESTIMATE

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A clear estimate starts here.

Enter your dimensions and product details to see the quantity and purchase breakdown.

CONTINUE YOUR PLAN

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Formula and assumptions

BEHIND THE NUMBERS

How this calculation works.

Pot fill = π × fill height × (top radius² + top radius × bottom radius + bottom radius²)/3; subtract supplied root-ball volume.

Pot fill = π × fill height × (top radius² + top radius × bottom radius + bottom radius²)/3; subtract supplied root-ball volume.Calculated with normalised units

A worked example

Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.

Loose mix volume per selected bag: 0.01 m³
Your material allowance: 0 %
Inside diameter at chosen fill level: 0.4 m
Inside bottom diameter: 0.4 m
Chosen fill height: 0.3 m
Supplied root-ball displacement per pot: 0.01 m³
Identical pots: 2

Potting mix bags: 6 bags

Straight-sided tapered vessel model. Uses diameter at the chosen fill level; no compaction or drainage layer is assumed.

Before you purchase

Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.

Measurements, product properties and application patterns are supplied by you. Illustrative examples do not recommend construction or planting specifications.

Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-05. Calculation and review policy.