Greenhouse Size Calculator
Enter plant count, bench depth, row spacing, and walkway width to get the minimum greenhouse floor area and a suggested layout.
Greenhouse Parameters
Distance between plant centers along the bench row.
Reach-in depth of each growing bench (typically 24–30 in for wall benches).
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Floor Area (sq ft)
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Suggested Length (ft)
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Suggested Width (ft)
Layout Breakdown
Plants per bench row
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Bench row length needed
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Total bench area
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Total aisle area
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Total floor area
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Suggested Floor Plan
Schematic view — not to scale. Green = bench rows, white = aisles.
Fill in the parameters on the left and click Calculate Greenhouse Size.
Summary
Enter plant count, bench depth, row spacing, and walkway width to get the minimum greenhouse floor area and a suggested layout.
How it works
- Enter the number of plants you plan to grow.
- Set the spacing between plants on the bench (in inches or centimeters).
- Set the bench depth — the reach-in dimension from the aisle.
- Enter the center aisle width and any side aisle width.
- Choose how many benches run side by side.
- The tool calculates total bench area, adds aisle area, and recommends greenhouse dimensions.
Use cases
- Size a new hobby greenhouse before buying a prefab kit.
- Plan a custom-built greenhouse to fit a specific yard footprint.
- Estimate whether an existing greenhouse can hold your plant inventory.
- Compare single-bench vs. double-bench layouts for the same plant count.
- Scale up from a seed-starting setup to a year-round growing space.
- Spec a small commercial greenhouse for market gardening.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu