A Soil Calculator helps you estimate the amount of soil needed for a garden, raised bed, planter, lawn, or landscaping project. Enter the area length, width, soil depth, and soil density to calculate the required soil volume and estimated weight.
Knowing the required soil quantity helps you plan delivery, compare supplier prices, avoid shortages, and reduce unnecessary waste.
How to Use the Soil Calculator
Enter the following values:
- Area length
- Area width
- Soil thickness or depth
- Soil density
The calculator returns:
- Soil volume
- Soil weight
Use compatible units for area length, width, and thickness. For example, if length and width are in metres, enter thickness in metres before calculating volume.
Calculate Soil Volume
To calculate soil volume, multiply the area length, area width, and soil thickness.
Soil Volume=Area Length×Area Width×Soil Thickness
The result is expressed in cubic units, such as cubic metres or cubic feet.
Calculate Soil Weight
To calculate soil weight, multiply the soil volume by the selected soil density.
Soil Weight=Soil Volume×Soil Density
Soil density can vary depending on soil type, moisture content, compaction, organic matter, and supplier specifications. Use the density provided by your supplier when possible.
Example Soil Volume Calculation
Suppose you need soil for an area with the following dimensions:
- Area length: 10 metres
- Area width: 5 metres
- Soil thickness: 0.3 metres
Soil Volume=10 m×5 m×0.3 m
Soil Volume=15 m3
The project requires 15 cubic metres of soil.
Example Soil Weight Calculation
Suppose the selected soil density is 1,500 kg/m³.
Soil Weight=15 m3×1500 kg/m3
Soil Weight=22500 kg
The estimated soil weight is 22,500 kilograms.
Soil Density and Weight Estimates
Soil density can change the estimated weight significantly. For the same 15-cubic-metre soil volume:
- At 1,300 kg/m³, the estimated weight is 19,500 kg.
- At 1,500 kg/m³, the estimated weight is 22,500 kg.
- At 1,700 kg/m³, the estimated weight is 25,500 kg.
Use the material density supplied for your topsoil, garden soil, compost blend, fill soil, or other selected material.
Important Soil Planning Tips
- Measure the full planting or fill area carefully.
- Convert soil depth into the same unit used for length and width.
- Add extra soil for settling, levelling, compaction, and normal spreading loss.
- Check whether delivery is sold by volume, weight, bag, or truckload.
- Confirm soil density and final order quantity with your supplier.
- Keep pathways, edging, existing plants, and other excluded areas out of the calculation.
Frequently Asked Questions
What does the Soil Calculator calculate?
The calculator estimates the soil volume and weight based on area length, area width, soil thickness, and soil density.
How do I measure soil depth?
Measure the desired depth of the soil layer from the existing surface to the planned finished level. Use the same unit as the other dimensions before calculating.
Why is soil density important?
Density determines how much the soil weighs for a given volume. Different soil types and moisture conditions can produce different weight estimates.
Should I order extra soil?
Yes. Add extra soil for settling, compaction, uneven ground, levelling, and normal installation loss.
Can I use this calculator for raised beds?
Yes. Enter the inside length, inside width, and desired soil depth of the raised bed.
Can I use this calculator for bagged soil?
Yes. First calculate the required soil volume, then compare it with the coverage volume shown on each bag. Round up when purchasing bags.
Is the soil weight estimate exact?
The result is an estimate. Actual weight may vary because of moisture, compaction, soil type, organic content, and supplier-specific density values.
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