Gravel Calculator
Working out how much gravel you need starts with a measurement: enter the length and width of each area (or a square footage you already know), choose how deep the gravel should sit, and the calculator turns that into the quantities you order. It reports total area, volume in cubic feet and cubic yards, an estimated weight in tons based on a typical density, bag counts for common bag sizes, and a bag-versus-bulk suggestion. A waste allowance is applied before the recommended order quantity, and if you have a supplier price you can see a material cost estimate as well. The page is built for homeowners and tradespeople planning a driveway surface layer, a walkway, a gravel patio, a garden path or general landscaping fill who want defensible numbers before they call a yard.
Calculator input
Project areas
Use one or more areas. The engine adds them before calculating volume.
What this calculator calculates
- Total area in square feet, with multiple shapes added together
- Volume in cubic feet and cubic yards, before and after waste
- Recommended order volume rounded up to the nearest 0.25 cubic yards
- Estimated tons (and tonnes) from the density you enter or the default
- Bag counts for common bag sizes, plus a bag or bulk purchase hint
- Material cost estimate built only from the price you enter yourself
Projects this calculator covers
- Driveway surface layerA single wearing course over an existing drive. Full base, middle and surface layering is planned in the Driveway Gravel Calculator.
- Walkways and garden pathsFirm, well-drained foot routes where 2–4 in over a prepared base is the usual planning range.
- Gravel patio and seating areasLoose surface over a compacted base, calculated here separately from the base material itself.
- Landscaping beds and general fillDecorative cover around plants, between pavers, or utility fill where depth changes across the site.
How the calculation works
Measure each area, choose a depth, add a waste allowance, and the engine converts area × depth into volume and purchase quantities.
Formula: Area × depth ÷ 12 = cubic feet; cubic feet ÷ 27 = cubic yards; cubic yards × density = estimated tons; waste and compaction are then applied to the order volume.
Worked example
20 × 30 ft area at 3 in depth
The engine calculates 600 sq ft and applies your selected depth and waste allowance.
Reading the results
- Cubic yards versus tons. Volume is what you measure; weight is what many suppliers bill. The tons figure comes from the density in use, so ask what density the product actually has before comparing a weight quote with a volume quote.
- Calculated volume versus order quantity. The calculated volume is the exact space your depth fills. The recommended order volume adds waste and any compaction factor, then rounds up to a quarter cubic yard because suppliers do not sell fractions of a yard.
- Bags versus bulk delivery. Below about half a cubic yard, bags are usually simpler. Above a couple of cubic yards a bulk load normally costs less per unit. The advice line is a planning hint rather than a rule.
- Material cost versus total cost. The cost figure multiplies your quantity by your price. Delivery, removal of spoil and labour are not included unless you add them yourself in Project Mode.
Assumptions
Central engine assumptions can be inspected in the methodology view. User-entered prices never get replaced with invented market prices.
Practical planning guidance
- Pick depth from the job: about 2 in for decorative cover, 3–4 in for paths and loose patio surfaces, deeper for drives that carry vehicles.
- Measure each separate area on its own and let the form add them up — one rectangle rarely covers an irregular yard.
- Allow 5–10% waste on straight runs and more where curves, edging or hand cutting dominate the job.
- Take the density from your supplier if they publish one; stone type and moisture move the weight more than most people expect.
- Remember that loose gravel settles, so a surface laid at the thin end of the range can stay thin.
Common mistakes
- Reading a cubic-yard figure and a ton figure as the same number — they only agree at the density the calculator used.
- Ordering the exact calculated volume with no waste, then finding the last few metres of path need another bag.
- Applying a decorative-stone density to a compactable base material and getting a weight that is far off.
- Calculating the surface layer but forgetting the base underneath it, which usually takes more material than the surface.
- Treating the estimate as delivered — confirm the load fee and minimum order separately with the supplier.
Important limitations
Frequently asked questions
How do I calculate how much gravel I need?
Measure length and width of each area, multiply for square feet, multiply by the depth in feet for cubic feet, then divide by 27 for cubic yards. The calculator does those steps, adds waste and shows an order quantity.
Is gravel measured in cubic yards or tons?
Both are common. Suppliers selling by volume use cubic yards; many quote by the ton. This page shows both numbers so you can compare either kind of quote.
How deep should I plan for gravel?
Decorative cover is often around 2 in, paths and loose patios 3–4 in, and vehicle surfaces deeper over a prepared base. Traffic, drainage and stone size all shift the right number.
How much waste should I allow?
Ten percent is the default and suits most rectangular jobs. Raise it for curves, extensive edging, or a site where material is lost over the sides.
How do I convert cubic yards of gravel into tons?
Multiply cubic yards by the density in tons per cubic yard. The calculator uses a typical value near 1.35–1.4 for gravel, but the supplier product may differ.
Can I calculate multiple areas at once?
Yes. Add rectangles, circles, triangles or a known square footage and the engine totals the area before applying depth, waste and density.
Can this calculator estimate cost?
It can, but only from a price you enter per cubic yard, ton or bag. It never invents a market price, and delivery stays outside the figure unless you account for it separately.
Planning guides
Related calculators
Your estimate will appear here
Enter your dimensions, then calculate. Results stay tied to the tested engine.