How to use the Gravel Cubic Feet Calculator
- Measure the area to cover and the target layer depth. Match bulk density to the loose or compacted material being ordered.
- 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.
Gravel 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.
Gravel worked examples
Estimate bags for a gravel strip
Cover a 10 ft × 6 ft strip at 3 in depth. Use 5% extra volume and an illustrative package volume of 0.5 ft³ per bag.
- Area 60 ft² × depth 0.25 ft = 15 ft³
- Order volume = 15 × (1 + 5 ÷ 100)
- Bags = round up (15.75 ÷ 0.5)
Answer: 15.75 ft³. Base volume: 15 ft³; Cubic yards: 0.583333 yd³; Litres: 445.990334 L; Whole bags: 32 bags.
Estimate gravel delivery weight
Cover 100 ft² at 2 in depth with no allowance. For this example only, use a supplier density of 100 lb/ft³, 0.5 ft³ bags and a 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 ÷ 0.5)
Answer: 16.666667 ft³. Base volume: 16.666667 ft³; Cubic yards: 0.617284 yd³; Litres: 471.947443 L; Whole bags: 34 bags; Estimated weight: 1,666.666667 lb; US short tons: 0.833333 tons; Estimated cost: 6.17284 currency units.
Gravel Cubic Feet Calculator FAQs
How do I get tons of gravel?
Enter the supplier’s bulk density in lb/ft³. The result uses 2,000 lb per US short ton.
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 Gravel
Use the installed area and target depth. Ask the supplier whether its stated density and package volume refer to loose or compacted material.
Assumptions and limits
Aggregate grading, void space, moisture and compaction change weight per cubic foot. A chosen allowance is an ordering estimate.
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.