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Square Feet to Cubic Yards Calculator

Construction

Convert square feet and fill depth into cubic yards of material needed for concrete, gravel, soil, or mulch projects. Fast and accurate volume estimates.

1100,000
0.548

Cubic Yards

12.35
Cubic Feet
333.33

This calculator computes your Cubic Yards, Cubic Feet from the values you enter.

Inputs
Area (sq ft)Depth (in)
Outputs
Cubic YardsCubic Feet

What is a Sq Ft to Cu Yd?

A square feet to cubic yards calculator converts a known area — measured in square feet — into a volume of material, measured in cubic yards, by applying a fill depth. This conversion is essential whenever you already have an area measurement (from a floor plan, property survey, or another calculator) and need to determine how much bulk material, like concrete, gravel, topsoil, or mulch, is required to fill or cover that space.

The math itself is straightforward but easy to get wrong by hand: area in square feet must be multiplied by depth converted from inches to feet, and the resulting cubic feet figure must then be divided by 27 to reach cubic yards, the unit suppliers actually use for pricing and delivery. Skipping either conversion step leads to significant ordering errors.

This calculator complements the Square Footage Calculator, which is useful for measuring the area of irregular rooms or lots first, and the Cubic Yard Calculator, which handles the same conversion but starts from separate length and width inputs instead of a pre-calculated area.

How to use this Sq Ft to Cu Yd calculator

  1. Enter the Area (sq ft) — the total square footage you already know from a plan, survey, or prior measurement.
  2. Set the Depth (in) — the thickness of the material layer you intend to apply, such as 4 inches for a gravel base or 3 inches for mulch.
  3. Read the Cubic Yards result — this is the figure to use when ordering material from a supplier.
  4. Check Cubic Feet if your supplier quotes pricing by the cubic foot instead.
  5. Adjust the Depth value to compare volume requirements at different fill thicknesses before finalizing your order.
  6. Add a 5–10% buffer to the final cubic yard figure to account for compaction, spillage, or an uneven base.

Formula & Methodology

The conversion formula is:

Cubic Feet = Area (sq ft) × (Depth (in) ÷ 12)

Cubic Yards = Cubic Feet ÷ 27

Depth is divided by 12 to convert from inches to feet, matching the unit of the area measurement, and the resulting cubic feet total is divided by 27 because one cubic yard equals 27 cubic feet.

Worked example: For a 1,000 square foot area with a 4-inch fill depth:

Cubic Feet = 1,000 × (4 ÷ 12) = 1,000 × 0.333 = 333.33 cubic feet

Cubic Yards = 333.33 ÷ 27 = 12.35 cubic yards

At an estimated $45 per cubic yard for bulk topsoil, this would cost approximately $556 in material before delivery fees — always confirm current pricing with your local supplier.

Frequently Asked Questions

Converting square feet to cubic yards means turning a flat area measurement into a volume measurement by applying a fill depth. Square feet describes a two-dimensional area, while cubic yards describes three-dimensional volume — the unit suppliers use to price and deliver bulk materials like concrete, gravel, mulch, and soil.
You enter the total area in square feet and the fill depth in inches. The calculator multiplies area by depth (converted from inches to feet) to get cubic feet, then divides by 27 to convert to cubic yards, updating the result instantly.
Cubic Yards = (Area in square feet × Depth in inches ÷ 12) ÷ 27. The depth is first converted from inches to feet by dividing by 12, then the resulting cubic feet figure is divided by 27 to reach cubic yards.
Use this calculator when you already know your total square footage — for example, from a property survey, floor plan, or the [Square Footage Calculator](/square-footage-calculator/) — and just need to apply a depth. The [Cubic Yard Calculator](/cubic-yard-calculator/) is better suited when you're measuring a simple rectangular area and want to enter length and width separately.
Using the formula, Cubic Feet = 1,000 × (4 ÷ 12) = 333.33 cubic feet, and Cubic Yards = 333.33 ÷ 27 = 12.35 cubic yards. This is the typical volume of gravel needed to cover a 1,000 square foot driveway or base layer at a standard 4-inch depth.
A typical gravel driveway base is 4 to 6 inches deep, though heavier vehicle traffic may call for a deeper base of up to 8 inches. Enter your intended depth into the Depth field to get an accurate cubic yard estimate for that specific application.
Mulch beds are typically applied at a depth of 2 to 4 inches — thinner layers can wash away or fail to suppress weeds, while thicker layers risk smothering plant roots. Use 3 inches as a reasonable middle-ground default if you're unsure.
Yes, as long as you already know the total square footage of the irregular area — calculated separately by breaking the shape into rectangles or using the [Square Footage Calculator](/square-footage-calculator/) — you can enter that total directly into this calculator's Area field along with your desired depth.
Most contractors recommend ordering 5–10% more than the calculated volume to account for uneven ground, compaction, and spillage during placement. For critical pours like concrete slabs, err toward the higher end of that range since running short mid-pour is far more disruptive than having leftover material.
Yes, especially over large areas — for a 1,000 square foot area, each additional inch of depth adds roughly 3.09 cubic yards to the total. Small depth changes compound quickly across larger areas, so it's worth confirming your intended depth precisely before ordering.
This calculator is commonly used for concrete, gravel, crushed stone, topsoil, sand, and mulch — any bulk fill material that's priced and delivered by the cubic yard. The underlying volume math is identical regardless of material; only the depth convention typically changes based on the application.
Area is entered in square feet, and Depth is entered in inches — both standard US measurement units for construction and landscaping projects. The output, Cubic Yards, is the standard unit US suppliers use to price and deliver bulk materials.
Also known as
square feet to cubic yards calculatorsq ft to cu yd calculatorfill volume calculatorarea to cubic yards calculatorgravel volume calculator