Cannabis Yield Estimator

• Maximize light coverage. Aim for 30–50 watts of quality LED per square foot. More light = more photosynthesis = heavier buds, up to the point of light stress.
• Train your plants. SCROG and LST create an even canopy where every bud site receives direct light. Untrained plants waste energy on shaded lower growth.
• Dial in your VPD. Use our VPD Calculator to optimize temperature and humidity for maximum transpiration and nutrient uptake.
• Feed correctly. Nutrient deficiency stunts growth, while overfeeding burns tips and locks out nutrients. Use our Nutrient Calculator for stage-specific targets.
• Choose high-yielding genetics. Strain genetics set the ceiling for your yield. Some strains naturally produce 20–30% more than others under identical conditions.
• Extend veg time. Larger plants before flip produce more bud sites. For photoperiods, an extra 1–2 weeks of veg can significantly increase final harvest weight.

This calculator uses a baseline yield of approximately 1 oz (28g) per square foot under standard conditions (400W LED, soil, no training, intermediate grower). It then applies multipliers for each variable:

Light intensity is also factored in based on watts per square foot, with diminishing returns above 50W/sqft. The final result is presented as a range (±20%) to account for strain variation, environmental factors, and other variables that are impossible to predict precisely.