YardBatch field guide

Measure a garden bed accurately

A tape measure and a simple sketch are enough to turn most beds into a useful estimate.

YardBatch · Published September 25, 2026

Rectangles and squares

Measure the length and width in feet, then multiply them for square feet. A 12-foot-long bed that is 8 feet wide covers 96 square feet. Measure the space you will actually cover. For a raised bed, use the inside edges of the frame.

Circles

Measure straight across the center to find the diameter. Divide it by two for the radius, then use π × radius² for the area. A circle with a 10-foot diameter has a 5-foot radius and covers about 78.54 square feet. The circle option in each calculator handles that step for you.

L-shaped and irregular beds

Draw a rough outline and divide it into rectangles, circles, or triangles that do not overlap. Add the areas together. For a triangle, use base × perpendicular height ÷ 2. Subtract uncovered spaces, such as a patio or a large opening, before entering the total.

Curved edges often require an approximation. Smaller sections usually represent a curve better than one large surrounding rectangle. If you add an allowance for measurement uncertainty, keep it visible rather than changing your measurements to hide it.

Depth is the third measurement

Measure the depth you want to add, in inches. For a raised bed with existing soil, that is the gap between the current soil and the intended fill line. For a mulch refresh, it is the new layer you need to add.

Use the project specification or suitable gardening guidance to choose a depth. The calculator estimates volume; it does not select a planting depth or design a gravel base.

Keep mixed depths separate

If one section needs 2 inches and another needs 4 inches, calculate their volumes separately and add the cubic feet. Do not average the depths unless the areas are equal. Identical areas can use the quantity field under order adjustments.

Before you order, double-check units and make sure you did not count a section twice. Ask the supplier about rounding and minimum quantities.

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