Duck CheckedMeasured-use estimator
How long before this reservoir needs attention?
Do not use a catalog “up to” number. Measure daily use in your room with your plants, then keep a reserve for warmer days and imperfect timing.
Attention is more than adding water
The system may also need inspection, cleaning, mixing, pump checks, or root management. This calculator covers volume only.
Current primary guidance: University of Minnesota Extension on checking actual soil and plant water demand, reviewed 2026. This calculator still requires the reader's measured system use.