Cubic Feet to Cubic Yards Calculator

Converting cubic feet to cubic yards is straightforward once you know the relationship between the two units. A cubic yard is simply a bigger cube, so all you're really doing is shrinking a larger number down into a smaller, more manageable one.

Here's the basic process:

1. Measure or calculate your volume in cubic feet (length × width × depth, all in feet).
2. Divide that number by 27.
3. The result is your volume in cubic yards.

That's it. No complicated conversion factors or unit gymnastics. If you have 54 cubic feet of material, you have exactly 2 cubic yards. Most suppliers and contractors work in cubic yards, so this single step bridges the gap between your tape measure and their order form.

The formula is simple:

Cubic Yards = Cubic Feet ÷ 27

Or written symbolically: yd³ = ft³ ÷ 27

Plug in your cubic footage, divide by 27, and you're done. For example, if you've calculated that a space holds 135 cubic feet, dividing by 27 gives you exactly 5 cubic yards.

If you need to go the other direction and convert cubic yards back to cubic feet, just multiply by 27 instead. The same relationship works both ways.

One yard equals 3 feet. That part most people remember. But volume works in three dimensions, so when you scale up from feet to yards, you're not multiplying by 3 once. You're multiplying by 3 in each dimension: length, width, and height.

So the math looks like this: 3 × 3 × 3 = 27.

Picture a cube that's 3 feet long, 3 feet wide, and 3 feet tall. That cube holds exactly 1 cubic yard. Count up how many 1-foot cubes fit inside it and you'll land on 27 every time. It's a geometry fact that catches people off guard the first time they see it, but it makes perfect sense once you visualize it.

This is also why volume conversions are trickier than length or area conversions. A small change in the base unit creates a much bigger difference in the volume unit.

Here are some conversions that come up often in home improvement and construction projects:

• 9 cubic feet = 0.33 cubic yards (about one-third of a yard)
• 13.5 cubic feet = 0.5 cubic yards (half a yard)
• 27 cubic feet = 1 cubic yard
• 54 cubic feet = 2 cubic yards
• 81 cubic feet = 3 cubic yards
• 135 cubic feet = 5 cubic yards
• 270 cubic feet = 10 cubic yards

Half-yard and third-yard amounts matter more than people expect. A lot of small landscaping jobs fall right in that range, and knowing these benchmarks helps you avoid over-ordering and paying for material you won't use.

Use this quick-reference chart for common volumes without doing any math on the spot:

Values are rounded to three decimal places where necessary. For exact figures on large orders, always run the full calculation rather than relying on a rounded chart value.

Volume calculations show up constantly in construction and landscaping, and getting them wrong is an expensive mistake. Order too little and you're making a second delivery trip. Order too much and you're either storing extra material or paying to haul it away.

A few common scenarios where cubic yard conversions matter:

• Concrete slabs and footings: Contractors pour and order concrete by the cubic yard. You measure the slab dimensions in feet, calculate cubic footage, then divide by 27 to get your order quantity.
• Raised garden beds: A 4-foot by 8-foot bed filled 12 inches deep holds 32 cubic feet, which is just under 1.2 cubic yards of soil or compost.
• Gravel driveways: A standard residential driveway can easily require 5 to 15 cubic yards of gravel depending on depth and square footage.
• Excavation and fill dirt: Excavators charge by the cubic yard for removal, so knowing how to translate your trench or hole dimensions into yards keeps you from getting surprised by the invoice.

In landscaping especially, it's worth adding 10 to 15 percent to your calculated volume to account for settling and compaction. Dry, loose materials like topsoil and mulch compact significantly after delivery and installation.

Most bulk materials sold at landscape supply yards and concrete plants are priced and delivered by the cubic yard. Knowing this upfront keeps your estimates accurate from the start.

• Topsoil: Typically sold in half-yard or full-yard increments. One cubic yard of topsoil weighs roughly 1,000 to 1,300 pounds depending on moisture content.
• Mulch: Lighter than soil, but still sold by the yard. A 2-inch layer over 100 square feet requires about 0.62 cubic yards.
• Gravel and crushed stone: Dense and heavy. One cubic yard can weigh between 2,400 and 2,900 pounds. Always confirm weight limits before scheduling delivery.
• Sand: Used for leveling, drainage, and under pavers. Similar weight to gravel, and also ordered by the cubic yard.
• Ready-mix concrete: Always ordered in cubic yards. Concrete trucks typically carry between 8 and 10 cubic yards per load, and minimum order quantities often apply.
• Compost: Sold by the yard at most garden centers and municipal composting facilities. A lighter material that's easy to spread and work into existing soil.

When you're calling a supplier for a quote, have your cubic yard figure ready. Starting with cubic feet and converting on the fly during a phone call is a good way to make an ordering error.

A few practical habits make a real difference when you're doing volume calculations for a project.

• Always measure in the same unit first. Convert all your dimensions to feet before multiplying. Mixing feet and inches in the same calculation is the most common source of errors.
• Convert inches to feet as a decimal. Six inches is 0.5 feet, not 6. Three inches is 0.25 feet. Four inches is roughly 0.333 feet. Write these down before you start.
• Round up on material orders. It's far easier to return a small amount of leftover material (or find a use for it) than to place a second order and wait for another delivery.
• Double-check irregular shapes. If your project area isn't a simple rectangle, break it into sections, calculate each one separately, and add them together before dividing by 27.
• Account for waste and compaction. Loose fill materials settle. Concrete has leftover in the chute. Budget at least 5 to 10 percent extra beyond your calculated volume.
• Verify with your supplier. Some suppliers sell by the ton, not the cubic yard. Ask upfront so you can make sure you're comparing apples to apples.

Volume math doesn't have to be stressful. Nail down your measurements in feet, run the division, and add a small buffer. That three-step approach handles the vast majority of real-world projects without any headaches.