About this calculator

Pleurotus ostreatus has biological efficiency (BE) of 60–100% on spent coffee grounds — i.e. 1 kg dry substrate yields ~0.7 kg fresh mushrooms across 2–3 flushes over 6 weeks.

Frequently asked questions

What does the Oyster Mushrooms from Spent Coffee Grounds do?

Mushroom yield from spent coffee grounds — circular-economy grow kit. Pleurotus ostreatus has biological efficiency (BE) of 60–100% on spent coffee grounds — i.e. 1 kg dry substrate yields ~0.7 kg fresh mushrooms across 2–3 flushes over 6 weeks.

Is the Oyster Mushrooms from Spent Coffee Grounds free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Oyster Mushrooms from Spent Coffee Grounds?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified mushroom substrate professional before committing to a purchase or a job.

What inputs does the Oyster Mushrooms from Spent Coffee Grounds need?

Enter values for: Spent coffee grounds (kg dry), Biological efficiency (%). Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Oyster Mushrooms from Spent Coffee Grounds on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.