Reference utilities
Grower tools & calculators
The numbers and visual cues indoor growers reach for during planning — VPD targets, daily light integral, exhaust airflow, electricity cost, yield estimates, trichome staging. Every tool runs live in the browser against a documented formula. Nothing is transmitted, no accounts.
Tools
8
Categories
3
Account
Free
Runs on
Device
01 · Section
Environment & sizing
What the plant lives in — VPD targets, light delivery, exhaust airflow. Set the room before the cycle starts.
03
VPD calculator
Vapor pressure deficit from air temperature, relative humidity, and a leaf-temperature offset.
Open the tool
PPFD to DLI
Convert canopy-level PPFD and photoperiod hours into a daily light integral.
Open the tool
Tent CFM sizing
Inline fan CFM math from tent dimensions, including carbon filter and ducting overhead.
Open the tool
02 · Section
Cost & yield planning
What the cycle actually costs and what it returns — electricity, full grow spend, and yield estimates.
03
Light electricity cost
Daily and full-grow electricity cost from wattage, photoperiod hours, and kWh price.
Open the tool
Yield estimator
Estimate grams per cycle from tent area, light wattage, grower skill, and genetic potential.
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Grow cost calculator
Full cycle cost from seeds, electricity, soil, nutrients, and amortized hardware, with a per-gram figure.
Open the tool
03 · Section
Cycle reference
Visual references for the in-cycle calls — trichome staging, germination timing windows.
02
Browser-local
Every calculator runs entirely in your browser. No inputs are transmitted off the page; no accounts required.
Documented formulas
Reference ranges and math are drawn from published cannabis horticulture and HVAC literature. Each tool spells the formula out so the math is reproducible by hand.
Planning, not advice
Use the outputs as planning numbers and verify with calibrated instruments in the actual room before committing to a setup.
Spec'd the room — need the seeds
Verified genetics from our affiliate partner
The calculators set the room up. The actual cycle starts with verified genetics. ILGM is our single disclosed affiliate partner — Dutch and US breeders, in-house lines, tracked US shipping, germination guarantee, 90-day affiliate cookie.
Affiliate link — Lockbox Seeds may earn a commission, at no cost to you.
Match the room to a strain