🍄 Mycology Tool
🧫 Mushroom Agar Recipe Calculator
Instantly calculate precise agar ingredients for any batch size and recipe type
Select Recipe Type
ℹ️
Ideal all-purpose agar for most gourmet and medicinal mushroom species.
Batch Volume
💡
Standard batch = 1000 ml ≈ fills 20–25 Petri dishes (90mm).
Container Planning
Optional Additives
Select any anti-contaminant or growth-enhancing additives:
🍄 What Is the Mushroom Agar Recipe Calculator?
The Mushroom Agar Recipe Calculator is a specialized mycology tool designed to help cultivators — from hobbyists to professional lab technicians — quickly and accurately calculate the exact quantities of agar ingredients needed for any batch size.
Agar plates and slants are the backbone of mushroom cultivation. They are used for isolating cultures, cloning specimens, long-term storage, and generating clean mycelium for grain or substrate inoculation. Getting the recipe right is critical — too little agar and plates won't solidify properly; incorrect nutrient ratios can lead to poor mycelium growth or contamination-prone environments.
This tool supports multiple popular agar formulas including MEA (Malt Extract Agar), PDA (Potato Dextrose Agar), MYA (Malt Yeast Agar), and CWA (Corn & Wheat Bran Agar), plus a fully customizable recipe option for advanced users. Simply input your desired batch volume, choose your recipe, and let the calculator do the rest.
Agar plates and slants are the backbone of mushroom cultivation. They are used for isolating cultures, cloning specimens, long-term storage, and generating clean mycelium for grain or substrate inoculation. Getting the recipe right is critical — too little agar and plates won't solidify properly; incorrect nutrient ratios can lead to poor mycelium growth or contamination-prone environments.
This tool supports multiple popular agar formulas including MEA (Malt Extract Agar), PDA (Potato Dextrose Agar), MYA (Malt Yeast Agar), and CWA (Corn & Wheat Bran Agar), plus a fully customizable recipe option for advanced users. Simply input your desired batch volume, choose your recipe, and let the calculator do the rest.
⚙️ How Does It Work?
Using the calculator is simple and intuitive:
Step 1 — Choose Your Recipe: Select from four standard agar formulations or enter a fully custom recipe with your own ingredient ratios per liter.
Step 2 — Set Your Batch Volume: Enter the total volume of agar solution you need. The tool supports ml, liters, cups, and fluid ounces — auto-converting all values internally to milliliters.
Step 3 — Choose Your Containers: Select whether you're filling standard 90mm or 60mm Petri dishes, agar slants, Mason jars, or custom containers. The tool estimates how many containers your batch will fill.
Step 4 — Add Optional Additives: Include beneficial supplements like activated charcoal (for exotic species), hydrogen peroxide (contamination inhibitor), hydrated lime (pH adjustment), or extra agar for a firmer gel.
Step 5 — Calculate: Hit the button and instantly receive a complete, scaled ingredient list with precise gram measurements, water volume, estimated container count, and preparation notes.
Step 1 — Choose Your Recipe: Select from four standard agar formulations or enter a fully custom recipe with your own ingredient ratios per liter.
Step 2 — Set Your Batch Volume: Enter the total volume of agar solution you need. The tool supports ml, liters, cups, and fluid ounces — auto-converting all values internally to milliliters.
Step 3 — Choose Your Containers: Select whether you're filling standard 90mm or 60mm Petri dishes, agar slants, Mason jars, or custom containers. The tool estimates how many containers your batch will fill.
Step 4 — Add Optional Additives: Include beneficial supplements like activated charcoal (for exotic species), hydrogen peroxide (contamination inhibitor), hydrated lime (pH adjustment), or extra agar for a firmer gel.
Step 5 — Calculate: Hit the button and instantly receive a complete, scaled ingredient list with precise gram measurements, water volume, estimated container count, and preparation notes.
📐 Formula Explanation
All calculations are based on a proportional scaling formula derived from standard per-liter concentrations used in mycological science:
Unit conversions used internally:
Ingredient (g) = (Standard Concentration per 1000ml) × (Batch Volume in ml / 1000)
Water (ml) = Total Batch Volume − Volume displaced by dry ingredients*
Containers = Floor(Batch Volume ÷ Volume per Container)
*Simplified: Water ≈ Batch Volume (dry ingredients displace negligible volume)
Standard Concentrations (per 1000 ml):
Water (ml) = Total Batch Volume − Volume displaced by dry ingredients*
Containers = Floor(Batch Volume ÷ Volume per Container)
*Simplified: Water ≈ Batch Volume (dry ingredients displace negligible volume)
- MEA: Agar 20g + Malt Extract 20g
- PDA: Agar 20g + Dextrose 20g + Potato Extract 4g
- MYA: Agar 20g + Malt Extract 20g + Yeast Extract 2g
- CWA: Agar 20g + Corn Syrup 20g + Wheat Bran Powder 10g
Unit conversions used internally:
1 Liter = 1000 ml
1 US Cup = 236.588 ml
1 Fluid Ounce = 29.5735 ml
🌱 Practical Benefits for Cultivators
Saves Time: No more manual calculations or cross-referencing spreadsheets. Get accurate gram measurements in seconds.
Reduces Waste: Prepare exactly what you need — minimize over-preparation and expensive ingredient waste.
Ensures Consistency: Reproducible results across batches lead to better mycelium health and more reliable cultures.
Supports All Skill Levels: Beginners get guided recipes; advanced cultivators can use the custom mode for experimental formulas.
Container Planning: Know exactly how many Petri dishes or slants your batch will fill — plan your sterilization runs efficiently.
Contamination Control: Optional additives like H₂O₂ and activated charcoal can be precisely dosed to improve success rates.
❓ Frequently Asked Questions
MEA (Malt Extract Agar) is universally considered the best starting point for beginners. It uses only two dry ingredients — agar powder and malt extract — making it simple to prepare and consistent in results. MEA supports vigorous mycelium growth for the majority of gourmet and medicinal mushroom species including oyster mushrooms, shiitake, lion's mane, and reishi. Once comfortable, you can experiment with MYA (adding yeast extract) for faster colonization or PDA for species that prefer higher sugar content.
After mixing your dry ingredients thoroughly into water, the agar solution must be sterilized to eliminate all potential contaminants. The standard method is to pressure cook or autoclave the mixture at 121°C (250°F) at 15 PSI for 30–45 minutes. Do not boil without pressure, as this won't reach the temperature needed to kill bacterial endospores. After sterilization, allow the agar to cool to around 50–55°C before pouring into Petri dishes inside a still-air box (SAB) or laminar flow hood to maintain sterility.
Yes! Poured agar plates can be stored effectively when handled correctly. Stack plates upside down (agar side down) to prevent condensation drip onto the agar surface. Seal with Parafilm or place in zip-lock bags to retain moisture. Stored in a refrigerator at 4°C (39°F), plates typically remain viable for 3 to 6 months. For longer storage, ensure your agar doesn't dehydrate (shrink away from edges), which indicates aging. Plates with live mycelium cultures have a shorter shelf life and should ideally be transferred or used within 2–4 weeks.
Both are excellent general-purpose agar media, but they differ in their nutritional profile and ideal use cases. MEA (Malt Extract Agar) provides a balanced nutrient environment with natural sugars, minerals, and vitamins derived from malt. It closely mimics the nutrient profile found in decomposing wood and plant matter, making it ideal for wood-loving species. PDA (Potato Dextrose Agar) is richer in simple sugars (dextrose) and starch compounds from potato, promoting faster initial growth. It's widely used in general mycology and works especially well for fast-colonizing species. Some cultivators prefer MEA for long-term culture storage, while PDA is favored for rapid culture activation and diagnostics.
⚠️ Disclaimer: This calculator is intended for educational and informational purposes only. While every effort has been made to ensure accurate formulations based on established mycological standards, results may vary depending on ingredient quality, sterilization technique, environmental conditions, and target species. Always follow proper laboratory safety protocols when handling agar, pressure cookers, and microbiological media. This tool does not constitute professional mycological or scientific advice. The creator assumes no liability for outcomes resulting from the use of calculated recipes.
