materials calculator
Topsoil Calculator
The Topsoil Calculator applies volume = length × width × depth to entered measurements and returns topsoil volume, mass, and bag count. A numerical default is embedded in the served HTML before JavaScript runs. Use it for planning, then verify field measurements, current codes, product instructions, and structural assumptions before ordering or cutting.
Calculated result
7.41 yd³
Screened topsoil volume is depth times area. Mass uses the entered density; moist screened topsoil is typically near 1.1 t/yd³ (1.3 t/m³) and changes with moisture and organic content.
- Estimated mass
- 8.15 t
- Bags
- 267
- Coverage area
- 600 ft²
Printable result and cut list
| Item | Value | Job note |
|---|---|---|
| Primary result | 7.41 yd³ | Verify before cutting or ordering. |
| Estimated mass | 8.15 t | Calculated from the entered dimensions. |
| Bags | 267 | Calculated from the entered dimensions. |
| Coverage area | 600 ft² | Calculated from the entered dimensions. |
| Formula | Expression | Note |
|---|---|---|
| Primary formula | volume = length × width × depth | Round the final result, not each intermediate value. |
How the topsoil calculation works
Enter the job dimensions in the form. The calculator normalizes the values, applies volume = length × width × depth, and updates the main result, supporting values, diagram labels, and print table together.
The first displayed example is calculated during the static build. That makes the formula and a complete numerical result readable in page source, while the browser script handles later input changes.
Worked example
The prefilled values form a complete topsoil volume, mass, and bag count example. Change one field at a time and compare the updated result with the formula table to catch unit or transcription mistakes.
Common errors to avoid
- Mixing nominal and actual material dimensions.
- Entering diameter where the formula expects radius, or total run where it expects one tread.
- Rounding every intermediate value instead of rounding the final purchase or cut quantity.
- Treating a planning result as a stamped structural design or local-code approval.
How much topsoil depth each job needs
| Use | Depth | Metric |
|---|---|---|
| New lawn from seed or sod | 4–6 in | 100–150 mm |
| Levelling and top dressing | 0.5–1 in | 12–25 mm |
| Flower and shrub beds | 6–12 in | 150–300 mm |
| Vegetable beds | 12–18 in | 300–450 mm |
Delivered soil settles. Screened topsoil placed loose typically loses 10 to 20 percent of its depth after watering and light compaction, so order the settled depth plus an allowance rather than the loose figure.
Weight, bags, and delivery
Soil is sold by volume but hauled by weight. Screened topsoil is commonly near 1.1 tons per cubic yard (1.3 t/m³) when moist; wet or clay-heavy soil is heavier and can exceed a small trailer's rating.
Frequently asked questions
Does the topsoil calculator work without JavaScript?
The default worked result, formula, diagram, and result table are included in the served HTML. JavaScript is only needed to recalculate after you change an input.
Which unit should I use?
Use the imperial page for US customary inputs or open the metric twin for millimetres, centimetres, and metres.
Can I use the result for purchasing material?
Use it as a quantity and layout check, then add the stated waste allowance and confirm package coverage, stock dimensions, and field conditions.
Does this replace building code or an engineer?
No. The calculator is a planning aid. Current local code, product documentation, and a qualified engineer govern structural and life-safety decisions.
How many cubic yards of topsoil do I need for a lawn?
Multiply the lawn area in square feet by the depth in inches, then divide by 324. A 600 ft² lawn at 4 in deep needs about 7.4 cubic yards.
How much does a cubic yard of topsoil weigh?
Screened topsoil is roughly 2,000 to 2,400 lb (1.0 to 1.2 t) per cubic yard depending on moisture and organic content. Wet or clay soil weighs more.
How many bags of topsoil equal a cubic yard?
At 0.75 ft³ per bag it takes about 36 bags to fill a cubic yard, and about 50 bags of 20 litres to fill a cubic metre. Bulk delivery is usually cheaper past that point.
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