Irrigation Water Need
Calculator
Results
- Weekly water
- 1,250
Home and garden results
| Weekly water | 1,250 |
formula-map diagram
- Weekly water
- 1,250
Home and garden relationship
Formula
V = A × mm= 1250
Note
This result uses the values you entered and a simplified planning equation; verify quantities and local requirements before purchasing or building.
More in Home and garden
See all →Frequently asked questions
How much water does my garden actually need per week?+
Most established gardens need about 1-1.5 inches of water per week, including rainfall, delivered over one or two deep waterings rather than daily light sprinkling. The calculator converts that depth over your area into a gallon or liter total.
Why does watering deeply and infrequently work better than daily watering?+
Deep watering encourages roots to grow downward searching for moisture, building drought resistance, while frequent shallow watering keeps roots near the surface where they dry out faster and are more vulnerable to heat stress.
Does this calculation account for rainfall I've already received?+
The baseline weekly need already includes what rainfall typically provides, so if you've had significant rain, subtract that amount from your irrigation total for the week rather than watering the full recommended amount on top of it.
How does soil type change how much water I need to apply?+
Sandy soil drains fast and needs more frequent watering in smaller amounts, while clay soil holds water longer but absorbs it slowly, so the same weekly total is better applied gradually to avoid runoff. The calculator gives the total volume; how you split it depends on your soil.
Why do container plants need more frequent watering than the same plant in the ground?+
Containers have a limited soil volume that dries out much faster than ground soil, and they lose moisture from all sides including the bottom, so container plants often need daily watering in hot weather even though the same species in ground soil could go several days.