Gravel Driveway Estimate Calculator

This gravel driveway calculator works out the volume of gravel you need in cubic yards or cubic meters, along with the estimated weight in tons, based on the driveway’s length, width, and desired gravel depth. You enter the dimensions and depth, and it returns the total volume and weight, which you can then use to get pricing from a local supplier. The calculator handles the math for the most common gravel driveway shape (a rectangle), so you can focus on choosing the right stone and budgeting for delivery.

Formula

The calculator uses the standard volume formula for a rectangular prism:

Volume (cubic yards) = (Length × Width × Depth) ÷ 27

Where:

• Length is the driveway length in feet (ft)
• Width is the driveway width in feet (ft)
• Depth is the gravel layer thickness in inches (in), converted to feet by dividing by 12
• 27 is the number of cubic feet in one cubic yard (3 ft × 3 ft × 3 ft)

For the weight estimate, the calculator multiplies the volume by 1.4 tons per cubic yard. This is a typical bulk density for loose gravel (about 2,800 lb per cubic yard), but actual weight varies with stone type and moisture.

Worked Example

Using the default values from the calculator: length = 50 ft, width = 12 ft, depth = 4 in.

1. Convert depth to feet: 4 in ÷ 12 = 0.3333 ft
2. Calculate volume in cubic feet: 50 × 12 × 0.3333 = 200 cubic feet
3. Convert to cubic yards: 200 ÷ 27 = 7.41 cubic yards
4. Estimate weight: 7.41 × 1.4 = 10.37 tons (rounded to 10.37)

The calculator shows 7.41 cubic yards and 10.37 tons for these defaults.

How to Use This Calculator

Measure your driveway in feet (or meters, if you convert first). For a rectangular driveway, just multiply the length by the width. If your driveway is curved or has a widening near the garage, break it into rectangles, calculate each separately, and add the volumes together. For depth, 4 inches is the minimum for a car driveway; 6 inches is better for trucks or frequent heavy use. The calculator gives you the volume of compacted gravel, but you’ll actually order about 10–15% extra because gravel compacts down when rolled.

Choosing the Right Gravel Depth

Depth is the single most important factor in your estimate. Too little gravel means mud and ruts; too much wastes money. Here’s a practical guide:

• 2–3 inches: temporary paths or parking for small cars on firm soil
• 4 inches: standard for passenger car driveways
• 6 inches: recommended for trucks, RVs, or driveways on soft clay
• 8+ inches: only for heavy equipment or very poor soil

Most contractors install gravel in two layers: a coarse base (2–3 inches of larger stone) and a finer top layer (2–3 inches of smaller gravel). If you plan that, calculate each layer separately with the same length and width but different depths.

Common Mistakes and How to Avoid Them

The biggest error is mixing units. If you measure length in feet but depth in inches, you must convert depth to feet first (divide by 12). Another common mistake is forgetting that gravel is sold by the cubic yard, not by the ton, when ordering from a landscape supply. The weight estimate helps you compare prices if the supplier quotes per ton, but always confirm what unit their price uses.

Also, don’t assume the gravel will stay exactly where you put it. Edging (wood, stone, or metal) keeps gravel from spreading onto the lawn, and a slight crown in the middle helps water drain off. Neither affects the volume calculation, but they affect how long the driveway lasts.

Gravel Types and What They Cost (Roughly)

Gravel is sold by the cubic yard or by the ton, and prices vary widely by region and stone type. As a general rule, crushed stone (like limestone or granite) costs more than rounded pea gravel, but it interlocks better and makes a sturdier driveway. Pea gravel is cheaper but shifts under tires and needs more frequent topping up. Recycled concrete is often the least expensive option and works well for a base layer.

For a 50×12-foot driveway at 4 inches deep (7.4 cubic yards), you might pay anywhere from $80 to $150 per cubic yard delivered, depending on your area and the stone. That puts the material cost roughly between $600 and $1,100. Delivery fees, taxes, and labor (if you hire someone to spread it) add more. Always get quotes from at least two local suppliers, and ask whether the price includes delivery and spreading.

Alternatives to a Gravel Driveway

If gravel isn’t right for you, consider these options:

• Asphalt: smooth, durable, but costs several times more and needs periodic sealing
• Concrete: longest-lasting, but the most expensive and can crack in freeze-thaw climates
• Permeable pavers: eco-friendly, allow water to soak in, but high upfront cost
• Crushed shell or decomposed granite: similar to gravel but with a different look and feel

Gravel remains the cheapest option for a DIY driveway and is the easiest to repair—just add more gravel where it washes out.

Safety and Preparation Tips

Before you order, check for underground utilities by calling your local dig-line service—this is free in many regions and prevents hitting a gas or electric line. When spreading gravel, wear a dust mask if the stone is dry, and use gloves to protect your hands. If you’re driving a loaded pickup, don’t overload it; check the payload rating. For the driveway itself, make sure the ground is graded so water drains away from your house, not toward the foundation. A simple slope of 1% (1 foot drop per 100 feet) is usually enough.

Frequently Asked Questions

How much gravel do I need for a 100-foot driveway?

For a 100-foot long, 10-foot wide driveway at 4 inches deep, the volume is (100 × 10 × 0.333) ÷ 27 = 12.35 cubic yards. That’s roughly 17.3 tons at 1.4 tons per yard. Double-check your width and depth, as those change the number significantly.

Should I order in tons or cubic yards?

Landscape suppliers usually quote in cubic yards for volume, but some sell by the ton. If they sell by the ton, multiply your cubic yards by 1.4 to get tons (as the calculator does). Always ask which unit the price is in, and confirm whether the weight is for dry or wet gravel—wet gravel weighs more.

Can I use this calculator for a circular driveway?

No, this calculator assumes a rectangle. For a circular driveway, measure the outer radius and inner radius, calculate the area of the ring (π × (R² − r²)), then multiply by depth and divide by 27. Or break the circle into smaller rectangular sections and add them up.

What depth is best for a gravel driveway?

Four inches is the standard minimum for passenger cars. If you have heavy vehicles or soft soil, go with 6 inches. For a two-layer system, use 3 inches of coarse base and 3 inches of fine top gravel. Deeper than 8 inches is rarely needed and just wastes money.

How much does a gravel driveway cost per square foot?

Material alone is typically $1–$3 per square foot for 4 inches of gravel, depending on stone type and region. That doesn’t include delivery, labor, or any base preparation. A 50×12-foot driveway (600 sq ft) might cost $600–$1,800 for material, plus delivery fees.

Why does my gravel driveway keep washing out?

Usually it’s because the gravel is too thin, there’s no edging, or the driveway has a low spot where water pools. Increase the depth to at least 4 inches, add a slight crown (higher in the middle), and install edging to keep stones in place. Also check that downspouts don’t dump water onto the driveway.

Related

• Drywall Calculator by Square Footage
• Drywall Calculator by Wall: Sheets & Cost
• Drywall Calculator for Ceilings: Sheets & Waste

in len | Driveway Length | ft | 50 | 0
in wid | Driveway Width | ft | 12 | 0
in dep | Gravel Depth | in | 4 | 0
out vol | Gravel Volume | cu yd | (len * wid * (dep / 12)) / 27 | 2
out wt | Estimated Weight | tons | vol * 1.4 | 2