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Gravel Calculator | Estimate Cubic Yards And Tons From Area

Work out how much gravel, crushed stone or topsoil you need — in cubic yards and tons — from the length, width and depth of the area. The tool applies each material's density and shows the coverage per yard, so you order the right amount for driveways, paths and landscaping.

Last updated: July 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

Quick reference

MaterialApprox. weight per yd³1 yd³ covers at 3"
Pea gravel / pea stone (⅜")1.4 tons108 sq ft
Crushed stone (¾")1.4–1.5 tons108 sq ft
Crush and run (crusher run)1.5 tons, compacts 10–15%~95 sq ft after compaction
Decomposed granite1.5 tons108 sq ft
Crushed asphalt (millings)1.35 tons108 sq ft
River rock / cobble (2–4")1.3 tons~80 sq ft (voids)
Sand (dry)1.3–1.4 tons108 sq ft
Rip-rap (6–12")sold by the ton35–40 sq ft per ton at 12"

info Gravel Calculator

Free everyday calculator — enter your numbers and get an instant, accurate result.

info Private by design

Everything runs locally in your browser. No uploads, no accounts, no tracking.

info Works everywhere

Fully responsive and mobile-friendly — calculate on any device, any time.

info Educational

Includes the formula and step-by-step explanation so you understand the math, not just the answer.

Interpretation guide

ProjectRecommended depth
Decorative ground cover, walkways2–3 inches
Driveway top layer (driveway rock)3–4 inches over a base
Driveway base course / crush and run4–6 inches, compacted in 2" lifts
Drain rock around French drainsPipe bedded in 3"+ on all sides
Rip-rap on slopes and shorelinesLayer 1.5–2× the largest stone size

lightbulb Example — gravelling a 200 sq ft path 4 inches deep

You are covering a 200 sq ft area with gravel to a depth of 4 inches. Convert depth to feet (4 ÷ 12 = 0.333 ft), then multiply: 200 × 0.333 = 66.7 cubic feet, and divide by 27 to get cubic yards.

Result: 2.47 cubic yards ≈ 3.46 tons of gravel.

What this means: Order about 2.5 cubic yards (roughly 3.5 tons). Add 5–10% extra for compaction and spillage.

Formula & methodology

Formula: Cubic yards = area(ft²) × depth(in) ÷ 324

The Gravel Calculator is built on a well-established calculation method. It uses the formula Cubic yards = area(ft²) × depth(in) ÷ 324 to turn your inputs into a reliable result. A gravel calculator estimates how much gravel you need — in cubic yards and tons — from the length, width, and depth of your area. The steps are shown on the page so you can follow the reasoning from input to output.

Gravel volume uses the same area × depth model as mulch, then converts volume to tons using material density. Supplier tonnage can vary by stone type.

What is the Gravel Calculator?

The Gravel Calculator is a free, browser-based everyday calculator tool that helps you. Gravel calculator estimates how much gravel you need — in cubic yards and tons — from the length, width, and depth of your area.. Instead of working through the math by hand or in a spreadsheet, you enter your values and the calculator returns an accurate result instantly — while still showing the formula and the steps so you can verify the reasoning. It is designed for quick everyday use: no sign-up, no installation, and everything runs locally in your browser for complete privacy.

How to use the Gravel Calculator

  1. Enter the required values into the input fields.
  2. Press the calculate button — the result appears immediately, updated live as you change any value.
  3. Read the step-by-step breakdown below the result to see exactly how the calculation was performed.
  4. Use the interpretation guide to understand what the result means for your situation, and try different inputs to see how they change the outcome.

How to use the Gravel Calculator

Enter the length and width of the area in feet and the gravel depth in inches, then choose the gravel type. The tool computes the volume with Cubic yards = area(ft²) × depth(in) ÷ 324 and converts it to weight in tons using each gravel type's density. For a 200 sq ft area at 4 inches deep, you need about 2.47 cubic yards, or roughly 3.4 tons of crushed stone. Results are shown in cubic yards, cubic feet, and tons so you can order from any supplier.

Interpreting your result

Gravel is sold by volume in bulk (cubic yards) or by weight (tons), and the conversion depends on the material's density — crushed stone weighs about 1.4 tons per cubic yard, pea gravel about 1.3, and decomposed granite up to 1.6. Ordering by weight when the supplier sells by volume (or vice versa) is the classic mistake. The depth is the design variable: 2 inches suits decorative paths, 3–4 inches is right for driveways and parking, and 6+ inches with compaction is needed for heavy vehicle loads. The calculator bridges both measurement systems so the order matches the supplier's units.

Common mistakes to avoid

The most common error is mixing the depth units — the formula works with inches because of the 324 constant; using feet misorders by 12×. Second, ordering by the wrong unit: a supplier quoting tons when you calculated yards — the density conversion is essential. Third, ignoring compaction: gravel settles 10–20% after rolling, so order extra or re-top later. Finally, assuming all gravel weighs the same: the density range between types is 15% or more, and the wrong assumption changes the tonnage.

Tips for best results

Confirm the gravel type and its density with the supplier before ordering. Add 10–15% for settling and spillage on top of the calculated volume. For driveways, plan the depth to the base layer plus the top stone — they often use different sizes and depths. Compare bulk pricing in cubic yards against bagged pricing per bag to choose the cheaper route. If the area is irregular, split it into rectangles and sum. Get delivery quotes with the volume stated in the supplier's unit to avoid conversion surprises at the gate.

Authoritative source: timeanddate.com

Frequently asked questions

How do I use the gravel calculator?
Enter the length, width, and desired depth of the area you want to cover, then choose the gravel type. The tool converts the volume to cubic yards and estimates the weight in tons using each gravel type's density. For example, a 20 ft × 10 ft path at 3 inches deep needs about 1.85 cubic yards, roughly 2.6 tons of crushed stone.
What formula does the gravel calculator use?
The Gravel Calculator uses the standard Cubic yards = area(ft²) × depth(in) ÷ 324. You enter your values, and the calculator applies the formula step by step, showing the working so you can verify the math and understand how the result is derived rather than trusting a black box.
Is the gravel calculator accurate?
The Gravel Calculator applies the standard formula: Cubic yards = area(ft²) × depth(in) ÷ 324. It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.
Why do my results differ from another calculator?
The Gravel Calculator is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. A gravel calculator estimates how much gravel you need — in cubic yards and tons — from the length, width, and depth of your area. There is no limit on usage, and it works on any device.
How much pea gravel or pea stone do I need?
Measure the area in square feet, pick a depth (2–3 inches is standard for decorative pea gravel), and the calculator converts it: a 120 sq ft patio at 3 inches needs about 1.1 cubic yards, roughly 1.6 tons. Pea gravel and pea stone are the same ⅜-inch rounded stone — suppliers just name it differently by region.
How is crush and run (crusher run) different from clean crushed rock?
Crush and run mixes angular crushed stone with stone dust, so it locks together when compacted — that makes it the usual choice for driveway bases. It weighs about 1.5 tons per cubic yard and loses 10–15% of its volume under a plate compactor, so order that much extra. Clean ¾-inch crushed rock has no fines and stays looser, which is what you want around drains.
How many tons of rip-rap do I need for a slope?
Rip-rap is quoted by the ton, not the yard. A useful field rule: one ton of 6–12 inch rip-rap covers roughly 35–40 square feet at a 12-inch layer. For a 200 sq ft bank you'd order about 5–6 tons, and the layer should be 1.5–2 times the largest stone diameter.
Does the calculator work for sand, decomposed granite, and crushed asphalt?
Yes — the volume math (area × depth) is identical; only the density changes when converting to tons. Use about 1.35 tons per cubic yard for dry sand or asphalt millings and 1.5 tons for decomposed granite. A 50 lb bag of sand holds about 0.5 cubic feet, so one cubic yard replaces roughly 54 bags.
What depth should landscaping stone or ground cover rock be?
For weed-suppressing ground cover over fabric, 2 inches of ¾-inch rock is enough; go to 3 inches for larger river rock, since round stones leave voids. Doubling depth doubles tonnage, so on big areas it pays to stay at the minimum workable depth.
What does the Gravel Calculator do?
A gravel calculator estimates how much gravel you need — in cubic yards and tons — from the length, width, and depth of your area. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.
Is the Gravel Calculator free and private?
Yes — the Gravel Calculator. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.
How accurate is the Gravel Calculator?
The volume is exact for the dimensions entered: cubic yards = area(ft²) × depth(in) ÷ 324 is a precise conversion, and the tonnage uses the standard density for the gravel type you select. Practical accuracy depends on your measurements and the actual gravel density — different suppliers' material can vary a few percent, so confirm the density when ordering.

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