Water Top-Up Schedule Calculator
Estimate days between reservoir top-ups for a given plant count, reservoir size, and per-plant daily transpiration. Defaults use the Cornell CEA Hydroponic Lettuce Handbook midpoint for mature leafy greens; override with your measured rate for best results.
Percent of reservoir volume lost before you'd refill. 20% is a common operator target.
Default 150 mL/plant/day is the midpoint of the Cornell CEA Hydroponic Lettuce Handbook range (100–200 mL/plant/day) for mature leafy greens. Adjust based on your plant, stage, and environment.
Days until top-up~6.3 days
- Daily consumption
- 600 mL (0.159 gal)
- Top-up threshold volume
- 1.00 gal
Assumes steady transpiration. Actual rate varies with plant size, temperature, humidity, and airflow. Observe your own refill cadence and adjust the per-plant mL/day to match.