Window Well Gravel Calculator
Estimate drainage gravel for equal window wells using bed dimensions, optional drain-column dimensions, waste, bag volume, density and price.
Default project preview
52 bags
Gravel-bed volume
20 ft³
Drain-column volume
2.8 ft³
Purchased gravel volume
26 ft³
Estimated loose weight
2,553 lb
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Volume = rectangular gravel bed + optional cylindrical drain column. Multiply by well count, add settlement allowance and round to full bags.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Window Well Gravel Calculator questions
What is the drain-column input?+
It represents an optional gravel-filled vertical path below the surface bed. Enter zero when the detail does not use one.
Can gravel replace a connected drain?+
Not in every soil or foundation condition. The drainage design must provide a safe path for water away from the opening.
Should the well cover be included?+
No. Covers, drains, liners and excavation are separate items.