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Gravel Calculator

Enter the values to find how much gravel you need for your construction project along with its amount.

The area to fill is

Rectangular:

Circular:

Calculate Material using:

Width:

m ▾

Length:

m ▾

Diameter:

cm ▾

optional:

lb/ft³ ▾

Price/Unit of mass:

$ lbs ▾

Related

Gravel Calculator

This gravel calculator determines how much gravel you need to cover a rectangular or circular area to a certain depth. It can also calculate the total cost based on price per unit.

How Much Gravel Do I Need?

There are two main ways to determine the amount of gravel required:

1. Using Formulas

To calculate the required gravel, you need to know the volume of the area and the weight of the gravel.

Volume:

For a Square or Rectangular Area:

Volume = Length × Width × Depth

For a Circular Area:

Volume = 3.14 × (Diameter ÷ 2)² × Depth

Gravel Weight:

Weight = Volume (cubic feet) × Gravel Density (lb/ft³)

Note: Ensure all measurements are in the same units before calculating.

Example:

Cover a rectangular driveway: 20 ft long, 10 ft wide, gravel depth 5 inches, gravel density 104.88 lb/ft³, cost $100 per ton.

Solution:

Length = 20 ft
Width = 10 ft
Depth = 5 in = 5 ÷ 12 = 0.416667 ft
Gravel Density = 104.88 lb/ft³
Cost per ton = $100

Step 1: Calculate Volume

Volume = 20 × 10 × 0.416667 = 83.3334 ft³

Step 2: Calculate Gravel Weight

1 ton = 2000 lb

Weight (tons) = (Volume × Density) ÷ 2000 = (83.3334 × 104.88) ÷ 2000 ≈ 4.37 tons

Step 3: Calculate Total Cost

Cost = Weight × Price per ton = 4.37 × $100 ≈ $437

You can also use a gravel cost calculator for instant calculations.

2. Using a Gravel Calculator

Open the gravel calculator on calculator-online.net
Select the area you need to fill
Enter gravel details including density and price
Click "Calculate"
View estimated volume, weight, and total cost

Tips to Keep in Mind

Purchase 5-10% more gravel to account for waste or spillage
For complex or uneven areas, consult a professional for precise estimates

Why It’s Important to Use the Right Amount of Gravel

1. Cost Effectiveness

Too Little Gravel: May require extra purchase later at higher cost
Too Much Gravel: Leads to waste and unnecessary expense

2. Functionality

Too Little Gravel: Weak sub-base can cause bumps, instability, poor drainage, and weed growth
Too Much Gravel: Hard to walk or drive on, material waste

3. Aesthetics

The right amount ensures a clean, finished look. Too much appears bulky; too little looks sparse.

4. Safety

Proper depth creates a stable surface. Too little gravel can create unevenness and hazards.

FAQs

How much does a yard of gravel weigh?

A cubic yard typically weighs 2,200–2,900 lb depending on type, moisture, and particle size.

How Much Will 1 Ton of Gravel Cover?

100 sq. ft. at 2-inch depth
80 sq. ft. at 3-inch depth

How Many Inches of Gravel Should You Have?

Minimum 2–4 inches for general use; heavier traffic areas may require thicker layers.

Crushed Rock Coverage Per Ton

Material	Suggested Depth	Coverage Area per 1 ton
3”-8” rock	3”-8”	60 sq. ft.
1”-3” rock	1”-3”	80 sq. ft.
3/4”-1” screened gravel	2”	100 sq. ft.
5/8”-1/2” screened gravel	2”	120 sq. ft.
1/4”-3/8” screened gravel	2”	140 sq. ft.

References

Wikipedia: Gravel – Types, Formation, Modern Production
Basal Construction: How much gravel for your driveway?

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