Construction Calculators
Square Feet to Cubic Yards Calculator
Convert square-foot area and depth to cubic yards with optional user-entered overage and USD-per-cubic-yard cost.
Area and depth
The area input is always square feet. Material selection does not change geometric volume, so the previous nonfunctional material selector has been removed.
Optional; blank and 0 both mean no overage.
Optional; blank hides cost, while 0 displays USD 0.00.
Square feet to cubic yards formula
Convert the entered depth to feet, multiply square feet by depth to get cubic feet, then divide by 27. Overage is applied only after the base volume is known.
All cubic-foot and cubic-metre results shown after calculation come from the same final post-overage cubic-yard value.
Worked example
For 108 sq ft at 3 in deep, depth in feet = 3 / 12 = 0.25 ft. Base cubic feet = 108 × 0.25 = 27 ft³, and base cubic yards = 27 / 27 = 1 yd³.
If the user enters 10% overage, overage = 1 × 10 / 100 = 0.1 yd³. Final cubic yards = 1 + 0.1 = 1.1 yd³. The 10% value is an example, not a recommendation.
Scope and limitations
This tool estimates geometric volume from the dimensions you enter. It does not calculate material density, tons, bags, compaction, packaging, delivery, labor, tax, or structural adequacy.
Costs use only your optional USD-per-cubic-yard input. For material-specific assumptions, use the Gravel Calculator, Sand Calculator, Mulch Calculator, or Concrete Calculator.
Quick answers
What this calculator answers
- Workflow: Convert a known square-foot area and selected depth into cubic yards.
- Formula: Cubic yards = square feet × depth in feet / 27.
- Scope: This is geometry only; material density, weight, bags, compaction, and product coverage are not modeled.
Transparency note
Accuracy and limitations
Calzivo tools are built for practical estimates, conversions, and checks. Some tools use standard formulas or simplified assumptions, and results can be affected by input accuracy, rounding, units, local rules, or changing official requirements.
Construction estimates can vary with site conditions, waste, compaction, product coverage, local requirements, and measurement accuracy. Verify material orders before purchasing.
Reference check
Sources and references
These references provide background context for the topic. They do not replace official advice or documents for personal decisions.
- NIST Guide to the SI, Appendix B: Conversion Factors
National Institute of Standards and Technology
How to Use This Tool
Use these steps to enter the right inputs and interpret the result correctly.
Enter area in square feet.
Enter depth and select its unit.
Optionally enter overage and a USD price per cubic yard.
Calculate and review consistent post-overage volume units.
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Area Calculator
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Calculate volume for cubes, boxes, cylinders, spheres, cones, pyramids, and prisms with cubic unit conversions.
Gravel Calculator
Calculate gravel volume with optional supplier-density US-short-ton, product-label bag, overage, and user-entered cost estimates.
Sand Calculator
Calculate sand volume with optional supplier-density US-short-ton, product-label bag, overage, and user-entered cost estimates.
Mulch Calculator
Calculate mulch volume with optional product-label bag, overage, and user-entered cost estimates without a universal depth preset.
Concrete Calculator
Calculate multi-shape concrete volume with user-entered overage, optional product-label bag yield, and optional ready-mix or bag cost.
Related Guides
Background reading and explanations related to Square Feet to Cubic Yards Calculator.
Frequently Asked Questions
Common questions about Square Feet to Cubic Yards Calculator and how to read the result.
How do I convert square feet to cubic yards?
Multiply square feet by depth in feet to get cubic feet, then divide by 27.
Why is depth required?
Square feet is area. Depth supplies the third dimension needed for volume.
Does material type change the conversion?
No. The geometric volume is the same. Material density, compaction, bags, and product yield require separate assumptions.
What does overage do?
It adds the percentage you enter after calculating the base geometric volume.