Bulk Spawn / Substrate Calculator
Use the calculator below to estimate how much spawn and substrate you may need for your setup. It's a quick way to plan your grow and get a better idea of total quantities before ordering.
Helpful for tub planning, bag grows, and spawn-to-substrate ratios
Tip: Most growers use a 1:1 to 1:3 spawn-to-substrate ratio depending on species, container size, and how aggressively they want to run their setup.
Our grain spawn bags are available in 3 lb and 5 lb sizes. Our substrate bags are available in 3 lb, 5 lb, 10 lb, and 20 lb sizes.
The results provided are estimates. Actual weight may vary depending on substrate makeup, spawn used, and other factors.
Calculator powered by Calconic.