Estimate gallons a cylindrical rain barrel holds.
A rain barrel's volume is its cylindrical cross-section times its height, converted from cubic feet to gallons. Sizing the barrel against roof runoff tells you how much free water you can store for dry spells in the garden.
Rain Barrel Capacity
Gallons = π r² x height x 7.48
Gallons = π r² x height x 7.48 A rain barrel's volume is its cylindrical cross-section times its height, converted from cubic feet to gallons.
Sizing the barrel against roof runoff tells you how much free water you can store for dry spells in the garden.
This calculator takes 2 inputs: Barrel diameter, Barrel height. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.