Grow Tent Sizing Calculator

SCROG (screen of green) trains plants to grow laterally across a horizontal screen rather than growing tall, which spreads each plant's canopy over a wider area. This calculator applies a 1.6x space multiplier for SCROG versus 1.0x for no training -- the widest multiplier of the three training options -- and also enforces a minimum 6 ft tent height so there's enough vertical clearance below the screen for the canopy to fill in.

This calculator's base allowance jumps from 1 sq ft for Small (herbs, lettuce) to 4 sq ft for Medium (peppers, tomatoes) to 9 sq ft for Large (squash, indeterminate tomatoes) -- a 9x difference between the smallest and largest category before any training multiplier is applied. That per-plant figure is then multiplied by the number of plants and by the training-method multiplier to reach the total footprint.

No -- Tent Height is derived only from Plant Size and Training Method, not from how many plants are grown. Adding more plants increases Tent Width and Tent Length (since the total footprint scales with plant count) but has no effect on how tall the tent needs to be.

Plant Size sets the larger swing in this calculator's math: the base allowance ranges 9x from Small to Large (1 to 9 sq ft), while the Training Method multiplier ranges only 1.6x (1.0x to 1.6x). Training method still matters -- it can add 30-60% more space on top of whatever the plant size sets -- but plant size is the dominant driver of Sq Ft per Plant.