Grow Calculator
Yield Estimator
A realistic dried-weight range for your setup, based on the one factor that actually drives yield: light.
360–495 g
estimated dried yield
12.7–17.5 oz
total harvest for the run
90–124 g
per plant across 4 plants
Yield follows watts, not plant count
Photons are the raw material of flower. A fixture drawing 450 real watts produces roughly the same total harvest whether it sits over one plant or six — the difference is how long you veg to fill the space. That is why grams per watt is the standard benchmark.
Why experience shifts the number
The gap between a first run and a fifth run is almost never the nutrients. It is a stable environment, correct watering rhythm, canopy management, and the discipline to harvest at the right trichome colour instead of a week early out of impatience.
Training multiplier
An untrained plant puts most of its energy into one apical cola while lower sites become larf. Topping and low-stress training create an even canopy where every site sits in strong light, which is why we apply a meaningful penalty for untrained grows.
Common questions
- How much can one cannabis plant yield indoors?
- A well-grown photoperiod plant under 150-200 watts of quality LED typically produces 3-6 ounces dried. Yield tracks light and canopy area far more closely than plant count — four small plants under one light usually beat one plant under the same light.
- What is a good grams-per-watt number?
- First-time growers commonly land around 0.5-0.8 g/W. A second or third run with the same setup usually reaches 0.8-1.1. Experienced growers with a dialed environment hit 1.1-1.5 g/W, and above that generally requires CO2 supplementation.
- Does training increase yield?
- Yes, substantially. Topping, LST, and a SCROG net spread the canopy so light hits many colas instead of one dominant top. The same fixture over an even canopy can produce 20-40% more than over an untrained plant.
- Why is my yield lower than expected?
- The usual culprits are insufficient light intensity, containers too small to support the canopy, harvesting too early, and inconsistent watering. Environment problems — heat, VPD swings, poor airflow — cost more yield than nutrients ever will.