Landscape Rock Calculator

Omni Calculator’s landscape rock calculator tells you exactly how many cubic yards you need (or cubic meters), whether you’re covering a flower bed, lining a walkway, or filling in around trees and shrubs.

Simply enter your area and depth, and the calculator handles the rest, so you can order landscaping rock by the yard without over- or underestimating your landscape rock cost.

Landscape rock is typically sold by the cubic yard or by the ton, so the math starts with volume. In this landscape stone calculator​, we have two bed shapes. For a rectangular area:

1. Multiply length by width in feet to get square footage.
2. Multiply by the depth (converted from inches to feet) to get cubic feet.
3. Divide by 27 to convert to cubic yards, since that's the standard unit suppliers use.

For a circular bed, the process is similar but uses the formula for a cylinder:

1. Square the radius (half the diameter of your bed).
2. Multiply by pi, then by the depth (converted from inches to feet).
3. Divide by 27 to convert cubic feet to cubic yards.

This landscape rock calculator lets you enter your own depth, and automatically adds a waste factor (10% by default) to account for settling and uneven ground.

Getting the cubic yards of material you will need is straightforward with the landscape stone coverage calculator​​:

1. Select your bed shape: rectangular or circular.
2. Enter your dimensions:
   • Length and width for a rectangular area, or
   • Diameter for a circular one.
3. Enter the depth in inches or centimeters.
4. Adjust the waste factor if needed. It defaults to 10% to cover settling and uneven ground.
5. Read your result: the volume in cubic yards (or cubic meters) at the end of the landscape rock calculator.

From there, you’re ready to bring that number straight to your supplier.

Once you have your volume in cubic yards, you’ll likely want to convert that to weight, since many suppliers price landscape rock by the ton rather than by the yard.

Different landscape rock types have different densities: lightweight lava rock weighs far less per cubic yard than washed gravel or crushed limestone. The limestone calculator may help you with the calculations related to the latter material.

To get a rough weight estimate, multiply your cubic yards by the density of your chosen material (most suppliers list this per ton), so you’ll know roughly how much landscape rock there is per ton before ordering.

Most suppliers set a minimum for bulk orders, often around 1 cubic yard, so if your calculation comes out below that, bagged rock is usually the more practical option. Standard bags run 0.5 cubic feet, so you’d need about 54 bags to fill one cubic yard, a useful number when comparing bagged prices against bulk delivery.

Landscape rock costs also vary with distance from the quarry and with how the rock is processed. Crushed or angular rock tends to run cheaper than tumbled or polished varieties, since less processing goes into it.

If a supplier quotes by the ton rather than the yard, converting your volume first lets you compare quotes apples-to-apples rather than guessing.

Real yards rarely come in perfect rectangles or circles, so a few adjustments help keep your numbers accurate.

• Measure the longest and widest points of irregular areas, and round up slightly for safety.
• For borders or edging, treat the strip as a long, narrow rectangle.
• If your project has multiple distinct zones (a walkway plus a flower bed, for example), calculate each separately and add the totals.