How to use the Dirt Cubic Feet Calculator
- Measure the fill footprint and average depth. For stepped or uneven fills, calculate each area separately.
- Choose length and width or a known coverage area. Enter depth, allowance and actual package yield; add supplier density or price only when needed.
- Select Calculate. Review the result and its working; if you change an input, calculate again before copying or sharing.
Dirt formula
First calculate the geometric fill volume. Apply the entered percentage allowance to that volume, then divide by product yield and round up to whole bags.
Base volume = area × depth; order volume = base × (1 + allowance ÷ 100); bags = ceil(order volume ÷ bag yield)
What the terms mean
- Length
- A measured length in the selected unit; it is converted to feet before volume is calculated.
- Width
- A measured length in the selected unit; it is converted to feet before volume is calculated.
- Coverage area
- The measured area to cover, expressed in the selected square unit.
- Fill depth
- A measured length in the selected unit; it is converted to feet before volume is calculated.
- Extra volume allowance
- A percentage added to the geometric volume for the planning assumption you choose.
- Actual yield per bag
- Illustrative starting value. Replace with the volume or yield printed on your product.
- Bulk density (optional)
- Enter the supplier’s density for weight. Zero hides the weight estimate.
- Price (optional)
- Price per selected bag, volume unit or US short ton; use one currency consistently.
Dirt worked examples
Estimate a shallow fill-dirt layer
Cover a 10 ft × 6 ft area at 3 in depth, with 5% extra volume. For packaged material, this example uses 1.5 ft³ per bag.
- Area 60 ft² × depth 0.25 ft = 15 ft³
- Order volume = 15 × (1 + 5 ÷ 100)
- Bags = round up (15.75 ÷ 1)
Answer: 15.75 ft³. Base volume: 15 ft³; Cubic yards: 0.583333 yd³; Litres: 445.990334 L; Whole bags: 16 bags.
Estimate fill dirt from a surveyed area
A 100 ft² area needs 2 in of fill with no extra allowance. Use 1.5 ft³ packages and an illustrative price of 10 currency units per yd³.
- Area 100 ft² × depth 0.166667 ft = 16.666667 ft³
- Order volume = 16.666667 × (1 + 0 ÷ 100)
- Bags = round up (16.666667 ÷ 1)
Answer: 16.666667 ft³. Base volume: 16.666667 ft³; Cubic yards: 0.617284 yd³; Litres: 471.947443 L; Whole bags: 17 bags; Estimated cost: 6.17284 currency units.
Dirt Cubic Feet Calculator FAQs
Does this include compaction automatically?
Only the percentage you enter. The tool cannot infer compaction from the material name.
Why are bag counts rounded up?
A partial bag cannot supply the full required volume. Bag counts use the order volume including your entered allowance.
Measurement guide for Dirt
Break uneven ground into smaller areas with representative depths. An average depth is an estimate, and fill compaction can change the final level.
Assumptions and limits
Loose delivered fill and compacted final fill may occupy different volumes. Use a supplier or project allowance for that difference.
Bag yield and bulk density depend on the actual product. Allowance is applied to volume; bags are rounded up.
Check your result
Compare the base volume with area multiplied by depth in feet. The order volume includes your allowance; a bag count is rounded up using the entered product yield.