1 Yard of Concrete to Cubic Feet: Exact Conversion

This page converts cubic yards of concrete into cubic feet, the unit most ready-mix suppliers and project calculators use. You enter the volume in cubic yards (or the dimensions of your slab, footing, or column), and the calculator returns the equivalent in cubic feet, plus the number of 60-lb and 80-lb bags you’d need. It’s built for DIYers, contractors, and anyone ordering concrete who wants to avoid over- or under-ordering.

Formula

The core conversion is: 1 cubic yard = 27 cubic feet. So, to convert any volume from cubic yards to cubic feet, multiply by 27:

V_ft³ = V_yd³ × 27

• V_yd³ – volume in cubic yards (the unit you input, often from a truck order or a volume calculator).
• V_ft³ – volume in cubic feet (the result, useful for bag counts and small projects).

For bag estimates, we use standard industry approximations: a 60-lb bag yields about 0.45 ft³, and an 80-lb bag yields about 0.60 ft³. These are nominal values—actual yield can vary slightly with mix and water content.

Worked Example

Using the default input of 1 cubic yard:

1. Convert to cubic feet: 1 × 27 = 27 ft³.
2. Estimate 60-lb bags: 27 / 0.45 = 60 bags.
3. Estimate 80-lb bags: 27 / 0.60 = 45 bags.

The calculator shows: 27.00 ft³, 60 bags (60-lb), and 45 bags (80-lb). This matches the standard rule: one cubic yard equals 27 cubic feet, and you’ll need roughly 60 of the 60-lb bags or 45 of the 80-lb bags.

When to Use This Conversion

Use this calculator when you’re planning a concrete project and need to compare bulk orders (by the yard) with bagged concrete (by the bag). For example, a 10×10 slab that’s 4 inches thick is 10 × 10 × (4/12) = 33.33 ft³, which is about 1.23 yd³. This tells you to order 1.25 yards from a ready-mix truck or buy about 74 of the 60-lb bags. It’s also handy for estimating the volume of footings, columns, or any shape where you’ve already computed cubic yards.

How to Read the Result

The first number is your volume in cubic feet—this is what you’ll use for ordering bagged concrete. The bag counts are approximate; always add 5–10% for waste, spillage, and uneven subgrades. For ready-mix, you’ll typically order in cubic yards, so use the input directly. Remember that the calculator assumes a standard yield per bag; check the bag label for the exact yield, as some mixes (like high-strength or fiber-reinforced) may differ slightly.

Common Mistakes

• Mixing units: If you measure dimensions in feet, compute volume in ft³ first, then divide by 27 to get yards. Never multiply yards by 3—that’s linear, not cubic.
• Forgetting thickness: Slab thickness is often in inches; convert to feet (4 in = 0.333 ft) before multiplying.
• Rounding too early: Keep at least two decimals until the final step to avoid large errors on big projects.

Limits of the Formula

This conversion is exact for volume (27 ft³ per yd³). The bag counts are estimates based on typical yields; actual yield depends on the specific mix, water added, and compaction. For critical structural work, always consult the mix design and local building codes. The calculator does not account for waste, so add extra material as a buffer.

Frequently Asked Questions

How many cubic feet are in a yard of concrete?

Exactly 27 cubic feet. This is a fixed conversion because 1 yard = 3 feet, and cubing that gives 3³ = 27.

How many 80-lb bags of concrete do I need for 1 yard?

About 45 bags. An 80-lb bag typically yields 0.60 ft³, and 27 / 0.60 = 45. For 60-lb bags, you’d need about 60 (since 27 / 0.45 = 60).

Can I use this calculator for a slab that’s not a perfect rectangle?

Yes, but you’ll need to compute the volume of your shape in cubic feet first, then divide by 27 to get yards and enter that value. For irregular shapes, break them into rectangles, triangles, or circles and sum the volumes.

Why does my ready-mix order come in yards, not feet?

Ready-mix trucks carry large volumes, and cubic yards is the standard unit in the US for bulk concrete. One truck typically holds 9–10 yards, so yards are more convenient for ordering.

How much concrete do I need for a 10×10 slab that’s 4 inches thick?

Volume = 10 × 10 × (4/12) = 33.33 ft³, which is 33.33 / 27 = 1.23 yd³. You’d order 1.25 yards (or 1.5 to be safe) or buy about 74 of the 60-lb bags (33.33 / 0.45 = 74).

Does the calculator include waste?

No. Add 5–10% to your order to account for spillage, uneven ground, or miscalculations. For small projects, it’s often easier to buy an extra bag or two.

Final Thoughts

Converting cubic yards to cubic feet is a straightforward multiplication, but it’s easy to slip up when ordering concrete. This calculator gives you the exact volume in ft³ and a practical bag estimate, so you can confidently order the right amount for your project. Always double-check your measurements and add a little extra for waste—it’s cheaper than a second trip to the store.

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in yds | Volume (cubic yards) | yd³ | 1 | 0
out ft3 | Volume (cubic feet) | ft³ | yds * 27 | 2
out bags60 | 60-lb bags (approx) | bags | yds * 27 / 0.45 | 0
out bags80 | 80-lb bags (approx) | bags | yds * 27 / 0.60 | 0