Substrate Calculator
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2.5 in
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14.8 qtTotal Substrate
4.9 qtGrain Spawn
9.9 qtBulk Substrate
6.5 qtWater
Grain Spawn (lb)4.94
Bulk Substrate (lb)16.47
Water (lb)13.55
Final Moisture (Field Capacity)
82.3% wetter than field capacity
Substrate is hydrated to full water capacity; confirm with the squeeze test — a few drops should release under firm pressure.
Recipe Inputs (Dry Weight)
Vol
Weight
| Ingredients | Vol (qt) | Weight (lb) |
|---|---|---|
| Water | 6.50 | 13.55 |
| Coco Coir | 1.18 | 1.60 |
| Vermiculite | 2.20 | 1.31 |
| Gypsum | 0.00 | 0.01 |
Container Metrics (Hydrated)
| Total Substrate | Vol (qt) | Weight (lb) |
|---|---|---|
| Coco Coir | 5.79 | 11.22 |
| Vermiculite | 4.08 | 5.25 |
| Gypsum | 0.00 | 0.01 |
| Grain Spawn | 4.94 | 4.94 |
| Bulk Substrate | 9.88 | 16.47 |
| Total Substrate | 14.82 | 21.41 |
Hydrated volumes are estimates from a swelling model (dry volume plus absorbed water), not measured bulk densities. It can overestimate volume, and under-fill, for ingredients that soak water into their pores without expanding (e.g. vermiculite). Use as a guide, not exact figures.
Shopping List
- Coco Coirbuy ~25.6 ozHigh Quality Coco Coir Brick - 600g — 2× 600g brick ≈ $13.98
- Vermiculitebuy ~21.0 ozVermiculite - 1lb — 2× 1 lb bag ≈ $19.98
- Gypsumbuy ~0.1 ozColorado Cultures 1lb Premium Gypsum — 1× 1 lb bag ≈ $4.99
Estimated total: $38.95 USD
Estimate based on current shop prices, rounded up to whole packs.
Estimated Fresh Yield
Oyster2.19 – 4.38 lb
Typical biological-efficiency ranges; actual yield varies with strain, supplementation, and growing conditions.
Supplies for This Guide
Recommended cultivation supplies from independent vendors