Free tool
Substrate Hydration Calculator
Work out exactly how much water your dry substrate needs.
Runs in your browserOpen →
Free · no account
Cultivation calculators
Three tools that replace guessing with numbers: substrate hydration, inoculation rate, and a yield projection. Each one runs entirely in your browser — nothing you type is sent anywhere.
Free tool
Spawn Rate Calculator
Find the spawn weight for a chosen inoculation rate.
Runs in your browserOpen →
Free tool
Yield Estimator
Project a fresh-weight yield range from substrate and conditions.
Runs in your browserOpen →
How these work
All three calculators apply published cultivation rules of thumb — hydration by mass, inoculation rate as a share of substrate weight, and biological efficiency benchmarks per species. They are educational planning tools, not guarantees.