Mushroom Yield Calculator

It uses Biological Efficiency (BE) – the total fresh mushroom weight as a percentage of the dry substrate weight. Select a species (or “Other”), a substrate type, and moisture %, then the calculator converts your wet substrate weight into dry weight and applies your chosen BE to estimate yields. It displays Low, Mid, and High yield ranges based on typical BE values for each species.

Yes you can change the Biological Efficiency. BE represents how efficiently mushrooms convert substrate nutrients into fresh fruiting bodies. Each species loads with default Low / Mid / High BE values, but you can edit the Mid BE field to match your own experience or strain performance. The calculator uses your BE value for “Mid” yield predictions, while “Low” and “High” stay as fixed reference ranges.

Select “Other (set your BE)”. This option lets you enter any BE you like. It’s ideal for uncommon species, experimental strains, or new recipes. Simply estimate or test your BE and adjust the input until results align with your actual yields.

Yes, you can plan backwards from a target harvest.. Switch to Plan by Harvest, enter the total amount of fresh mushrooms you want to produce, and the calculator shows the minimum wet substrate needed to reach that yield in a worst-case scenario (using the Low BE). It also displays what that same amount of substrate might yield at your Mid and High BE values.

Moisture determines how much of your wet substrate is actually dry matter (default 60%). Flush settings split the total yield across 1-3 flushes. For example, 70/30 for two flushes or 50/30/20 for three. These don’t change the total BE; they simply show how yield might distribute over successive harvests. You can edit both moisture % and flush share values to reflect your own conditions/experience.