How to Use This Gravel Calculator
Follow these steps to estimate how much gravel you need for your project:
- Choose the unit system — select Imperial (ft/in) for US measurements or Metric (m/cm) for international units.
- Select the gravel type. Each type has a preset density. If you know the exact density of your material, choose Custom and enter the value manually.
- Enter the dimensions — provide the length and width of the area, or switch to Direct Area mode and enter the square footage / square meters directly.
- Enter the depth — the thickness of the gravel layer (in inches for Imperial, centimeters for Metric).
- Optionally, enter the price per unit of volume or weight, then select your currency to get the total material cost.
- Click Calculate Gravel and instantly see the volume, weight, and cost.
You can also use the calculator in reverse: if you know the weight available and the area, just calculate the depth you can fill.
How Much Gravel Do I Need?
To estimate the amount of gravel required, you need to determine the volume of the area to be filled. The formula is straightforward:
- Volume = Length × Width × Depth
- In Imperial: Volume (yd³) = Length (ft) × Width (ft) × Depth (ft) ÷ 27
- In Metric: Volume (m³) = Length (m) × Width (m) × Depth (m)
Once you have the volume, multiply it by the density of your chosen gravel type to get the weight. For example, regular gravel has a density of about 1,680 kg/m³ (105 lb/ft³). So 1 m³ of regular gravel weighs approximately 1.68 tonnes.
For irregular shapes, estimate the total square footage / square meters of the area and enter it directly using the Direct Area input mode.
How Much Is a Yard of Gravel?
A cubic yard (yd³) is the standard unit for selling bulk gravel in the United States. One cubic yard equals 27 cubic feet or about 0.765 cubic meters.
A cubic yard of gravel typically weighs between 2,400 and 2,900 lbs (roughly 1.2–1.5 US short tons), depending on the gravel type and moisture content. Pea gravel is lighter; granite and basalt are heavier.
Use the price field to estimate the total cost. Many suppliers quote prices per cubic yard or per ton — simply select the matching price unit in the calculator.
Types of Gravel
Different gravel types vary significantly in density and intended use:
- Regular gravel (1,680 kg/m³ / 105 lb/ft³) — standard mixed aggregate for driveways, paths, and drainage.
- Pea gravel (1,440 kg/m³ / 90 lb/ft³) — small, smooth, rounded stones. Ideal for playgrounds, garden paths, and decorative landscaping.
- Crushed stone (1,600 kg/m³ / 100 lb/ft³) — angular particles; excellent compaction and load-bearing capacity for driveways and foundations.
- Quartzite gravel (1,300 kg/m³ / 81 lb/ft³) — lighter, hard-wearing, and attractive for decorative use.
- Sandstone gravel (1,500 kg/m³ / 94 lb/ft³) — warm tones, commonly used in garden paths.
- Limestone gravel (1,760 kg/m³ / 110 lb/ft³) — durable and often used for driveways and road base.
- Granite gravel (1,820 kg/m³ / 114 lb/ft³) — very hard and durable; common for high-traffic driveways.
- Basalt gravel (1,840 kg/m³ / 115 lb/ft³) — dense volcanic rock; used for railway ballast, drainage, and decorative purposes.
- Slate chips (1,600 kg/m³ / 100 lb/ft³) — flat, sharp-edged pieces; popular for garden beds and pathways.
- Lava rock (1,000 kg/m³ / 62 lb/ft³) — lightweight volcanic rock; used in landscaping and garden beds.
- Custom — enter your own density value if you have the precise specification from your supplier.
Gravel Estimator — How to Calculate Landscape Gravel Quantity
Planning a landscape gravel path, a pea gravel patio, or a gravel driveway? Here is a practical step-by-step example:
Say you want to lay a gravel path that is 5 m long, 1 m wide, and 15 cm deep using regular gravel.
- Area = 5 m × 1 m = 5 m²
- Depth = 15 cm = 0.15 m
- Volume = 5 m² × 0.15 m = 0.75 m³
- Weight = 0.75 m³ × 1,680 kg/m³ = 1,260 kg ≈ 1.26 tonnes
In Imperial units, the same path would be approximately 16.4 ft long, 3.28 ft wide, and 5.9 in deep, giving a volume of ≈ 0.98 yd³ weighing approximately ≈ 2,775 lbs (≈ 1.39 short tons).
Always add 5–10% extra to account for compaction, waste, and uneven ground.
Making of the Gravel Calculator
This calculator was designed to answer the question "How much gravel do I need?" as accurately and simply as possible. It supports:
- Both measurement systems — US Imperial (feet, inches, yards, pounds, short tons) and Metric (meters, centimeters, kilograms, tonnes).
- 10 preset gravel types with real-world densities, plus a custom density option.
- Two input modes — enter length × width dimensions, or type the total area directly for irregular shapes.
- Cost estimation in 16 world currencies (USD, EUR, GBP, CAD, AUD, and more), with price per volume or weight.
Frequently Asked Questions
How deep should I lay gravel?
For a decorative garden path or flower bed, 2–3 inches (5–8 cm) is typically sufficient. For a functional driveway, 4–6 inches (10–15 cm) is recommended. For a base layer beneath pavers or slabs, 4 inches (10 cm) of compacted gravel provides a stable foundation.
How many bags of gravel do I need?
Bagged gravel is typically sold by weight (e.g., 50 lb or 25 kg bags). Use the weight result from the calculator, then divide by the weight per bag. For example, if you need 1,260 kg and bags weigh 25 kg, you need 1,260 ÷ 25 = 51 bags.
What is a cubic yard of gravel?
A cubic yard is a unit of volume equal to 3 ft × 3 ft × 3 ft = 27 cubic feet, or approximately 0.765 m³. It is the most common unit used by US suppliers for selling bulk gravel and landscaping materials.
How much does a ton of gravel cover?
One US short ton (2,000 lbs) of regular gravel covers approximately:
- At 2 inches deep: ~100 sq ft (≈ 9.3 m²)
- At 4 inches deep: ~50 sq ft (≈ 4.6 m²)
- At 6 inches deep: ~33 sq ft (≈ 3.1 m²)
Coverage varies with gravel type and density. Use this calculator for a precise estimate.