๐ฑ Gardening
Plant Watering Calculator
A plant needs roughly one inch of water per week spread over its root zone, and that volume scales with the area the roots occupy rather than the height of the plant. Containers are a special case because their limited soil volume dries out far faster.
How it works
Plant type
Root spread diameter
Number of plants
Container volume (containers only)
Sun exposure
Water per plant per week
Water per plant per week
Total for all plants
Watering frequency
Note
Frequently asked questions
How do I use the Plant Watering Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.