Substrate Calculator
Plan substrate batches with this calculator, then shop our supplies to run them.
Shop: Grain spawn · Sawdust spawn · Sterile grain · All-in-one bags · 5 lb RTF · 10 lb RTF · Workshops
How to use
- Pick a blend or build your own.
- Enter the batch weight you want (wet, finished).
- Enter the target moisture (most hardwood/soy blends run about 60%).
- Check each ingredient's current moisture. Dry bagged sawdust, hulls, and bran are usually around 10%. Gypsum is 0%.
Your recipe
Want to skip the mixing?
Our sterile grain and all-in-one bags come sterilized and ready to inoculate, and our Ready-to-Fruit blocks arrive colonized and ready to grow.