Greenhouse Size Calculator
By Number of Plants
Calculate greenhouse size based on how many plants you want to grow
By Known Dimensions
Calculate capacity of a greenhouse with known dimensions
Formula
Growing Area = Total Area × (1 - Walkway%) | Plant Capacity = Growing Area / Sq Ft per Plant | Volume ≈ Length × Width × Height × 0.7
Frequently Asked Questions
What size greenhouse do I need for a family garden?
A 10×12 foot (120 sq ft) greenhouse is ideal for most family gardens, fitting 40-60 vegetable plants. For seed starting only, an 8×10 (80 sq ft) works well. Serious growers may want 12×20 (240 sq ft) or larger.
How much does a greenhouse cost per square foot?
Hobby greenhouses cost $15-25/sq ft for basic hoop houses, $25-40/sq ft for polycarbonate kits, and $40-75/sq ft for glass greenhouses. A typical 10×12 polycarbonate greenhouse kit runs $2,000-5,000.
What is the best orientation for a greenhouse?
Orient the longest side east-west to maximize winter sun exposure. In the northern hemisphere, place the greenhouse where it gets full southern sun. Avoid locations shaded by buildings or trees, especially in winter.
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