Home & Garden Calculators
Gravel Calculator: Find Exactly How Much Gravel You Need (Yards, Tons & Bags)
Updated September 2026 · Written by Shivam, Software Engineer and Founder · Density figures sourced from industry-standard aggregate supplier data
Ordering gravel is one of those jobs where guessing costs real money — order too little and you’re paying for a second delivery fee, order too much and you’re stuck with a pile you didn’t need. This gravel calculator solves that in two ways: one mode for driveways, walkways, and garden beds (working in yards and tons), and a second mode built specifically for aquarium and fish tank substrate (working in pounds per gallon). Enter your measurements once and get a straight answer, not a guess.
What’s on this page
Gravel Calculator
One thing worth clearing up before you start typing in numbers: a “gravel calculator” search covers a lot of different projects, and most of them share the same underlying math. Whether you landed here looking for a pea gravel calculator for a garden bed, a driveway gravel calculator or gravel driveway calculator for a resurfacing job, a gravel calculator in yards or a gravel calculator in tons for a bulk delivery quote, a stone calculator or crushed stone calculator for a base layer, a rock calculator or river rock calculator for a landscape accent, a sand calculator for paver prep, or an aquarium gravel calculator for a new fish tank — the tool below handles all of it. Pick a material and a use case, and the formula adjusts automatically.
Calculate Your Gravel Needs
Switch tabs depending on the project — landscaping and driveway gravel work in cubic yards and tons; aquarium gravel works in pounds per gallon.
Area & Depth
Material
Add 5-10% extra to any order to cover compaction, spillage, and uneven ground — suppliers round up, and a short delivery costs more than a slightly generous first order.
Tank Size
Substrate Depth
Based on the widely used fishkeeping rule of roughly 1-2.5 lbs of gravel per gallon depending on bed depth. It’s a planning estimate, not an exact figure — actual coverage varies by gravel grain size.
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How to Calculate How Much Gravel You Need
The math behind every gravel calculator, including this one, comes down to three numbers: length, width, and depth. Here’s the formula in plain terms:
The part people trip over is depth. Suppliers and calculators work in feet, but nobody measures a gravel bed in feet — you measure it in inches. Convert first: divide your inch measurement by 12. A 4-inch driveway depth becomes 0.33 feet before it goes into the formula.
Worked example: a 20-foot by 10-foot driveway section at 4 inches deep:
- 20 × 10 = 200 square feet
- 200 × (4 ÷ 12) = 66.7 cubic feet
- 66.7 ÷ 27 = 2.47 cubic yards
- 2.47 × 1.5 tons/yd³ (crushed stone) = about 3.7 tons
That’s exactly what the calculator above does automatically, across five common materials, with the option to convert straight to a cost estimate if you already have a price per ton from your supplier. If you specifically searched for a gravel calculator yards breakdown or a gravel calculator tons figure, the results panel shows both side by side, along with the equivalent cubic feet, so there’s no manual conversion left to do.
Gravel Density by Type
Two loads of gravel that look identical in a wheelbarrow can weigh noticeably different amounts, because density depends on shape, not just size. Rounded stones like pea gravel and river rock leave more air gaps between pieces than angular, crushed material, which packs tighter and weighs more per cubic yard. This is exactly why a generic sand calculator or river rock calculator can’t just reuse a crushed-stone density number — swap the material dropdown above and the weight estimate changes even when the volume stays identical. Crushed stone and construction sand and gravel are tracked as separate commodities by the U.S. Geological Survey precisely because they behave differently as materials, not just as line items on an invoice.
| Material | Typical Weight (tons/cubic yard) | Common Use |
|---|---|---|
| Crushed stone / #57 stone | 1.5 | Driveways, french drains, general fill |
| Crusher run / road base | 1.6 | Compacted base layer under driveways and patios |
| Pea gravel | 1.4 | Walkways, dog runs, decorative beds |
| River rock, decorative | 1.35 | Landscape accents, dry creek beds |
| Sand | 1.3 | Paver base, playground fill |
Density figures reflect typical ranges reported by aggregate and landscaping suppliers; material classifications follow the U.S. Geological Survey’s National Minerals Information Center categories for crushed stone and construction sand and gravel. Moisture content, grain size, and how tightly a load is compacted during transport can all shift the actual weight by 5-10% either direction — when precision matters for a large order, ask your specific supplier for their tested density.
Driveway and Yard Gravel: How Much Do You Actually Need
Depth is the single biggest lever in any gravel calculator built for yards and tons, because it’s a multiplier, not an addition. Doubling your depth doubles your tonnage — there’s no shortcut around that relationship, whether you’re pricing out a full driveway gravel calculator run or just topping off a garden path.
- Walkways and garden paths: 2 inches is standard. Enough to define the path and suppress weeds without becoming a tripping hazard.
- Residential driveways: 4 inches of top-layer stone over a compacted base is the typical contractor spec.
- New driveway builds: many contractors lay a 4-6 inch crusher run base layer first, then top it with 2 inches of a finer decorative stone like pea gravel or #57 crushed stone.
On price, crushed stone and pea gravel both commonly run in the $30-$50 per ton range picked up from the supplier’s yard, before delivery. Delivery fees vary widely by distance and load size, so it’s worth asking for a delivered price upfront rather than comparing per-ton figures alone.
Larger properties often need the math run twice — once in cubic yards for a supplier quote, and once in tons for the actual delivery truck’s weight limit. A single truck typically hauls somewhere between 10 and 16 tons depending on its size, so a large driveway or long rural lane may need to be split across multiple loads regardless of how the total is calculated. Running your numbers through both a stone calculator view (by volume) and a tonnage view before calling a supplier avoids the awkward conversation of re-ordering mid-project.
Aquarium and Fish Tank Gravel Calculator
Fish tank gravel is a completely different calculation from yard gravel, because nobody buys aquarium substrate by the ton — it’s sold and measured by the pound, against gallons of water rather than square feet of ground.
The rule of thumb most fishkeepers use is roughly 1 to 1.5 pounds of gravel per gallon of tank capacity for a standard 1-2 inch substrate bed, scaling up toward 2-2.5 lbs per gallon for a deeper, planted-tank-style bed. That’s the exact logic built into the aquarium tab of the calculator above — enter your tank’s gallons (or its length, width, and height in inches if you don’t know the gallon rating), pick a bed depth, and it converts straight to an estimated pound count.
If you’re setting up a tank from scratch and don’t know its gallon capacity, the conversion is: Length × Width × Height (all in inches) ÷ 231 = gallons. The calculator handles this automatically when you switch to “Calculate from dimensions.”
Common Mistakes That Throw Off Your Order
These show up constantly in landscaping forums and supplier complaint calls, and every one of them is avoidable with a quick double-check before you place an order:
- Forgetting to convert inches to feet before multiplying. A 4-inch depth is 0.33 feet, not 4 feet — this single slip can inflate an estimate twelvefold.
- Assuming all gravel weighs the same. The gap between the lightest and heaviest common materials in the table above is roughly 20%, which matters on a multi-ton order.
- Not accounting for compaction. Gravel settles after it’s spread and driven or walked on — ordering the bare-minimum calculated amount often leaves a visibly thinner layer within weeks.
- Mixing up cubic feet and cubic yards when talking to a supplier. Most aggregate yards quote and deliver by the cubic yard or by the ton, not by cubic feet — confirm which unit a quote is using before you order.
- Using yard-gravel math for an aquarium, or vice versa. The two use entirely different units (tons vs. pounds) and entirely different reference points (square footage vs. gallons) — they aren’t interchangeable calculations.
Frequently Asked Questions
How much gravel do I need? (Calculator method)
Multiply length × width × depth (all in feet) to get cubic feet, divide by 27 for cubic yards, then multiply by your material’s density in tons per cubic yard. The calculator above does this automatically for five common gravel and stone types.
How do I calculate how much gravel I need without a calculator?
Measure your area’s length and width in feet and multiply them together for square footage. Convert your desired depth from inches to feet by dividing by 12, then multiply that by the square footage to get cubic feet. Divide by 27 for cubic yards.
How do I calculate yards of gravel for a project?
Cubic yards = (Length ft × Width ft × Depth ft) ÷ 27. For example, a 15 × 8 foot area at 3 inches (0.25 ft) deep is (15 × 8 × 0.25) ÷ 27 = 1.1 cubic yards.
How much does a yard of gravel weigh?
Most gravel and crushed stone weighs between 2,600 and 3,200 pounds per cubic yard — roughly 1.3 to 1.6 tons — depending on the material. Crushed stone and road base run heavier; pea gravel and decorative river rock run lighter.
How much does a ton of gravel cover?
At a 4-inch depth, one ton of crushed stone covers roughly 65-80 square feet. At a shallower 2-inch depth, that same ton stretches to cover roughly 130-160 square feet, since coverage area and depth have an inverse relationship for a fixed weight.
How much gravel does a fish tank need?
As a general rule, plan for 1 to 1.5 pounds of aquarium gravel per gallon of tank capacity for a standard substrate bed, rising to 2-2.5 lbs per gallon for a deeper, planted-tank-style layer. A 20-gallon tank typically needs roughly 20-30 lbs for a standard bed.
