Garden Soil Calculator

About the Garden Soil Calculator

Calculates the volume of soil or compost needed to fill a rectangular garden bed, in both cubic metres and litres.

How to use

Enter the bed length, width and fill depth in metres, then click Calculate.

Worked example

A 2 × 1 m bed filled 0.3 m deep → 0.6 m³ (600 L).

How to use this calculator

1. Measure the garden bed length, width, and desired depth.
2. Make sure all measurements use the same unit, such as feet or metres.
3. Multiply length by width by depth to get the volume.
4. Use the result as the amount of soil or compost to order, adjusting for waste or settling if needed.

The formula explained

• \(\text{volume}\) = the amount of soil or compost needed
• \(\text{length}\) = the bed length
• \(\text{width}\) = the bed width
• \(\text{depth}\) = the fill depth

Step by step method

1. Start by entering the bed dimensions into the calculator.
2. The tool multiplies the three measurements to find the total volume.
3. Check the unit shown in the result so you know how much material to buy.
4. If your bed is irregular, split it into simpler shapes and total the results.

Worked example

Suppose you want to fill a rectangular raised bed that is 8 feet long, 4 feet wide, and 0.5 feet deep.

1. Compute the area of the base: \(8 \times 4 = 32\) square feet.
2. Multiply by depth: \(32 \times 0.5 = 16\) cubic feet.
3. Use that total as the amount of soil or compost needed for the bed.

Tips and common mistakes

• Keep all measurements in the same unit before multiplying.
• Use the planned fill depth, not the height of the bed walls.
• For irregular beds, break the space into rectangles and add the volumes together.
• Order a little extra if the soil will settle after watering.

Frequently asked questions