Rain Barrel Capacity
Estimate gallons a cylindrical rain barrel holds.
About Rain Barrel Capacity
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.
Formula
Rain Barrel Capacity
Gallons = π r² x height x 7.48
- 7.48
- Gallons in one cubic foot
Worked example
With the default values below, Rain Barrel Capacity returns Gallons of 70.5. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Barrel diameterminimum 0 ft
- 2 ft
- Barrel heightminimum 0 ft
- 3 ft
Results
- Gallons
- 70.5 gal
- Liters
- 266.9 L
- Cubic Feet
- 9.42 cu ft
Step by step
- 1Values used
- 2Rain Barrel Capacity
- 3Gallons= 70.5 gal
- 4Liters= 266.9 L
- 5Cubic Feet= 9.42 cu ft
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Rain Barrel Capacity calculated?
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.
Why does Rain Barrel Capacity matter?
Sizing the barrel against roof runoff tells you how much free water you can store for dry spells in the garden.
What values do I need to enter?
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.