⚖️ Mushroom Wet-to-Dry Weight Calculator
Convert fresh mushroom weight to dried weight and back. Uses species-specific water content ratios for accurate results.
Estimated Dried Weight
10.0g
Based on 10:1 ratio (90% water content) for General (Most Mushrooms)
Fresh
100.0 g
Dried
10.0 g
Understanding Mushroom Wet to Dry Ratios
Fresh mushrooms are composed of 85-95% water. When you dehydrate them, you remove nearly all of that moisture, leaving behind concentrated flavor, nutrients, and texture. This is why most mushrooms have a wet-to-dry ratio of approximately 10:1 — meaning 10 grams of fresh mushrooms yields about 1 gram dried.
The exact ratio varies by species. Oyster mushrooms, which have particularly high water content, can be closer to 11:1. Morel mushrooms, being somewhat denser, tend toward 9:1. The calculator above uses species-specific ratios for the most accurate conversion.
Common Conversions
| Fresh Weight | Dried Weight (10:1) |
|---|---|
| 100g (3.5 oz) | 10g (0.35 oz) |
| 250g (8.8 oz) | 25g (0.88 oz) |
| 500g (1.1 lb) | 50g (1.76 oz) |
| 1 kg (2.2 lb) | 100g (3.5 oz) |
| 1 lb (454g) | 45g (1.6 oz) |
| 5 lb (2.27 kg) | 227g (8 oz) |
FAQ
What is the wet to dry ratio for mushrooms?
Most mushrooms are approximately 90% water, giving a 10:1 wet-to-dry ratio. This means 100g of fresh mushrooms yields about 10g dried. Some species vary slightly — oyster mushrooms are closer to 11:1 while morels are about 9:1.
How much dried mushroom equals 1 pound of fresh?
Approximately 1.6 ounces (45g) of dried mushroom equals 1 pound (454g) of fresh mushroom, based on the typical 10:1 ratio. The exact amount varies by species.
Why do mushrooms lose so much weight when dried?
Fresh mushrooms are 85-95% water by weight. When dehydrated, nearly all of this water is removed, leaving only the dry matter — fiber, protein, minerals, and flavor compounds. This is why dried mushrooms have such concentrated flavor.
About This Calculator
Whether you're dehydrating your harvest or rehydrating dried mushrooms for a recipe, knowing the exact fresh-to-dried conversion ratio saves you from guessing. This mushroom dry weight calculator uses species-specific water content data so you get accurate results for shiitake, oyster, lion's mane, morel, chanterelle, and more.
Proper dehydration is key to long-term mushroom storage. Dried mushrooms stored in airtight containers can last 6-12 months at room temperature and even longer in the freezer. If you're growing from a grow kit, expect 2-3 flushes before the block is spent — and each flush is a great opportunity to dehydrate surplus.
Temperature matters too. Check our temperature guide for optimal dehydrator settings by species. Most mushrooms dehydrate best at 125-135°F (52-57°C) for 6-8 hours until cracker-dry.