Gravel Calculator
Estimate exactly how much gravel, crushed stone, or pea gravel you need for your driveway, patio, or landscaping. Enter your dimensions below to calculate total cubic yards, tons, and estimated cost.
Project Dimensions
Enter your project measurements to see your gravel estimate.
Total Volume Required
Includes 10% waste allowance.
Total Weight Estimate
0.00 Tons
Based on 1.4 tons per yard.
How to Use the Gravel Calculator
Whether you are calculating gravel for a new driveway, figuring out a pea gravel patio, or building a retaining wall base, ordering the right amount of material is essential. Ordering too little halts your project, while ordering too much leaves you with a heavy pile of dirt and rock you have to pay to haul away.
Our tool simplifies this process. Simply enter the dimensions of your project and the desired depth. The gravel estimator automatically calculates the total cubic yards required, converts that volume into tons based on material density, and provides a cost estimate.
How the Calculation Works
Calculating gravel involves finding the three-dimensional volume of your project space and dividing it into standard units of measure (usually cubic yards). Because you measure your yard in feet, but depth in inches, it requires careful unit conversion.
The Gravel Volume Formula
Volume in Cubic Feet = Length (ft) × Width (ft) × [Depth (in) ÷ 12]
Cubic Yards = Cubic Feet ÷ 27
Worked Example: 10×10 Area at 3 Inches Deep
Assume you are creating a small seating area that measures 10 feet by 10 feet, and you want to lay pea gravel to a standard depth of 3 inches.
- Find Square Footage: 10 ft × 10 ft = 100 square feet.
- Convert Depth to Feet: 3 inches ÷ 12 = 0.25 feet.
- Calculate Cubic Feet: 100 sq ft × 0.25 ft = 25 cubic feet.
- Convert to Yards: 25 cubic feet ÷ 27 = 0.925 cubic yards.
- Add Waste (10%): 0.925 × 1.10 = 1.01 cubic yards.
Understanding Gravel Density (Yards vs. Tons)
One of the most confusing parts of ordering landscaping materials is that some suppliers sell by volume (cubic yards) while quarries and large delivery trucks sell by weight (tons). Our gravel ton calculator bridges this gap.
A cubic yard of standard crushed stone or gravel weighs approximately 2,800 pounds (1.4 tons). However, the exact density changes based on the size of the rock and how it is crushed. For example, porous volcanic rock is much lighter than dense crushed granite.
| Material Type | Approx. Tons per Cubic Yard | Best Used For |
|---|---|---|
| Pea Gravel | 1.35 to 1.4 Tons | Playgrounds, decorative walkways, patios. |
| Crushed Stone (#57) | 1.4 to 1.45 Tons | French drains, driveway topcoat, concrete base. |
| Crusher Run / Base (Class 5) | 1.5 to 1.6 Tons | Driveway bases, paver bases (compacts tightly). |
Important Variables for a Lasting Driveway or Patio
Before ordering your bulk material, ensure you are preparing the subgrade properly. You can find comprehensive engineering guidelines regarding subgrade compaction, aggregate thickness, and drainage in documentation provided by the Federal Highway Administration (FHWA) for gravel roads.
- Compaction: When estimating base rock (like Class 5), remember that plate compactors will compress the loose volume by 15% to 20%. Our calculator’s default 10% waste factor covers normal spillage, but you may want to increase it to 15% for heavily compacted bases.
- Depth Selection: Do not lay pea gravel deeper than 2 to 3 inches for foot traffic. Because round stones don’t lock together, walking through deep pea gravel feels like walking through deep sand.
- Subgrade Fabric: A major mistake is calculating how much gravel to pour over raw dirt. You must use commercial geotextile fabric. Without it, your crushed stone will slowly sink into the mud every time it rains.
Frequently Asked Questions
How to calculate gravel requirements?
To calculate gravel requirements, multiply the length of your area by the width to get the square footage. Then, multiply the square footage by the depth (converted to feet) to get cubic feet. Finally, divide the total cubic feet by 27 to find the required cubic yards.
Is 1 ton of gravel the same as 1 cubic yard?
No, 1 ton of gravel is not the same as 1 cubic yard. A cubic yard is a measurement of volume, while a ton is a measurement of weight. For standard crushed stone or gravel, 1 cubic yard typically weighs about 1.4 tons (2,800 pounds).
How far will 20 yards of gravel cover?
The coverage of 20 cubic yards of gravel depends entirely on the depth. If spread at a standard depth of 3 inches, 20 cubic yards will cover approximately 2,160 square feet. If spread at 4 inches deep, it will cover about 1,620 square feet.
How many yards of gravel for a 10×10 area?
A 10×10 area is 100 square feet. If you are laying the gravel 3 inches deep (which is standard for a walkway or patio base), you will need roughly 1 cubic yard of gravel (0.93 cubic yards, rounded up to 1).
How many wheelbarrows is 1 yard of gravel?
A standard contractor wheelbarrow holds about 3 cubic feet of material when moderately heaped. Since 1 cubic yard equals 27 cubic feet, it takes exactly 9 full wheelbarrow loads to move 1 cubic yard of gravel.
Can I just put gravel over dirt?
While you can put gravel directly over dirt, it is highly discouraged. Over time, rain and foot traffic will push the gravel down into the mud, and weeds will easily grow through it. You should always excavate, compact the soil, and lay commercial landscape fabric first.
Will weeds grow through 3 inches of gravel?
Yes, weeds will eventually grow through 3 inches of gravel if you do not use a weed barrier. Dirt and organic matter blow in from above, creating a bed for weed seeds to germinate within the gravel itself, even if the native soil below is covered.
What should I put down before laying gravel?
Before laying gravel, you should clear all vegetation, excavate the area to the desired depth, compact the soil base with a hand tamper or plate compactor, and then lay down a heavy-duty, woven geotextile landscape fabric to separate the soil from the stone.
Do you have to put sand under gravel?
You do not usually need to put sand under decorative gravel or driveway gravel. However, if you are building a paver patio or flagstone walkway, you will put down a thick base of coarse gravel first, followed by a 1-inch layer of bedding sand on top of the gravel to level the stones.
What is the best material to put under gravel?
The absolute best material to place underneath decorative gravel or crushed stone is a high-quality, woven geotextile fabric. For driveways, a larger, coarser base rock (like #3 or #4 crushed stone) is often laid down before topping with a finer gravel.
What goes first, sand or gravel?
In hardscaping construction, the gravel base goes first. You lay 4 to 6 inches of crushed gravel, compact it thoroughly, and then apply 1 inch of bedding sand directly on top of the compacted gravel before laying pavers or bricks.
When not to use pea gravel?
Do not use pea gravel for driveways, steep slopes, or pathways where you will roll heavy carts. Because the stones are small and round, they do not lock together. They will constantly shift, sink under tires, and wash away in heavy rain.
Disclaimer: This calculator provides planning estimates only. Material densities vary significantly by quarry and stone type. Verify critical quantities, compaction rates, and local delivery minimums with your landscaping supplier before purchasing.
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