Substrate Calculators

These free calculators are provided to help farmers estimate the amount of substrate pellets they will need for various mushroom substrates. We are starting with the two most popular the Special Fruiting Mix, and the Fast Fruiting Mix.

These calculators are based on the standard formula that calls for 60% moister content on average. Enter in the size of your grow block, and the amount of blocks you want to make and they will let you know the pounds of pellets to order. Just reload the page if you want to calculate weekly, and monthly amounts. The more you ship at one time the lower the cost of shipping once you ship by the pallet.

Special Fruiting Mix Calculator

Special Fruiting Mix Calculator

80% Oak Hardwood & 20% Wheat Bran Pellet Mix

This calculator assumes 60% water weight in the finished block, since the pellets expand when hydrated. You will need 0.4 lbs of Special Fruiting Mix pellets for every 1 lb of finished substrate.
Please enter a block size greater than zero.
Please enter at least 1 block or bag.

Your Substrate Requirements

Finished Block Size
Number of Blocks
Total Finished Substrate
Water Weight (60%)
Special Fruiting Mix Needed
Fast Fruiting Mix Calculator

Fast Fruiting Mix Calculator

50/50 Oak & Soy Hull Pellet Mix

Please enter a block size greater than zero.
Please enter at least 1 block or bag.

Your Substrate Requirements

Block Size
Number of Blocks
Total Finished Substrate
Fast Fruiting Mix Needed

These tools are intended to make ordering easier. Your in-house substrate formula may vary based on a number of factors. The variety of mushrooms you grow, location, and desired moister content can change these estimated numbers.