Estimate weekly gallons of water a garden bed needs.
One inch of water on a square foot is roughly 0.623 gallons, so multiplying bed area by the weekly depth gives the watering volume. Measuring water by depth rather than by time makes plants self-sufficient and prevents both drought stress and root rot from overwatering.
Irrigation Water Needs
Gallons = area x water depth x 0.623 (one inch on one sq ft)
Gallons = area x water depth x 0.623 (one inch on one sq ft) One inch of water on a square foot is roughly 0.623 gallons, so multiplying bed area by the weekly depth gives the watering volume.
Measuring water by depth rather than by time makes plants self-sufficient and prevents both drought stress and root rot from overwatering.
This calculator takes 2 inputs: Bed area, Weekly water depth. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.