Garden Bed Area Calculator
Enter your garden bed shape and dimensions to instantly calculate area and how much soil, mulch, or compost you need at any depth.
Use the Garden Bed Area Calculator
Bed Shape & Dimensions
Common: 2–3 in mulch, 6–12 in soil/compost for raised beds.
Enter dimensions and click Calculate
Surface Area
—
sq ft
—
sq meters
Fill Volume at — depth
—
cu ft
—
cu yards
—
cu meters
Bags Needed (+10% buffer included)
—
1 cu ft bags
—
2 cu ft bags
Bag counts are rounded up and include a 10% settling allowance.
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Summary
The Garden Bed Area Calculator helps gardeners quickly find the surface area of any garden bed shape — rectangular, circular, or triangular — and then estimate how much bulk material (soil, mulch, or compost) is needed to fill it to a target depth. Enter your dimensions in feet or meters, choose a fill depth, and get results in cubic feet, cubic yards, and standard bag counts in seconds.
How it works
- Select a bed shape: rectangular, circular, or triangular.
- Enter the bed dimensions in feet or meters (length/width, radius, or base/height).
- Enter the desired fill depth in inches or centimeters.
- The calculator computes the surface area and multiplies by depth for total volume.
- Results show cubic feet, cubic yards, and the number of standard 1-cubic-foot and 2-cubic-foot bags.
Use cases
- Plan how much topsoil to buy when building a new raised bed.
- Estimate compost needed to top-dress an existing garden bed.
- Calculate mulch volume for a circular or triangular planting area.
- Compare fill costs between bulk delivery and bagged material.
- Verify a delivery order before purchasing soil in bulk.
- Size a new circular bed around a tree or focal point.
Frequently Asked Questions
Last updated: 2026-06-11 · Reviewed by Nham Vu