Concrete Cost per Cubic Foot Guide - Bags vs Ready-Mix
Convert concrete cost per cubic foot from bag price, ready-mix price per yard, delivery fees, minimum loads, and quote scope.
Concrete cost per cubic foot is useful when you are comparing bagged concrete, small repairs, and ready-mix quotes in the same project. Bags are sold by weight, ready-mix is sold by cubic yard, and contractors often quote the full installed scope, so everything needs to be normalized before comparison.
Use the Concrete Cost per Yard Guide for ready-mix pricing and the Concrete Bags per Yard Guide for bag counts. If you are comparing bids, use the Concrete Quote Reviewer.
Quick answer
One cubic yard equals 27 cubic feet. To convert ready-mix price per yard into cost per cubic foot, divide by 27.
ready-mix cost per ft3 = price per yd3 / 27
bag cost per ft3 = bag price / bag yield ft3
At $165 per yd3, ready-mix is about $6.11 per ft3 before delivery, minimums, tax, and fees. An 80 lb bag at $6.50 with a common 0.60 ft3 yield is about $10.83 per ft3 before delivery, tax, mixer rental, and labor. Confirm product yield and job requirements with a qualified local professional.
Cost per cubic foot conversion table
| Price basis | Formula | Cost per ft3 |
|---|---|---|
| Ready-mix at $140/yd3 | $140 / 27 | $5.19 |
| Ready-mix at $165/yd3 | $165 / 27 | $6.11 |
| Ready-mix at $190/yd3 | $190 / 27 | $7.04 |
| 80 lb bag at $6.50 | $6.50 / 0.60 | $10.83 |
| 60 lb bag at $5.25 | $5.25 / 0.45 | $11.67 |
| 40 lb bag at $4.25 | $4.25 / 0.30 | $14.17 |
The table explains why a bag can be convenient but still cost more per usable cubic foot. However, ready-mix may add a minimum-load fee that changes the effective cost for small projects.
Effective cost after delivery and minimums
Small orders are where cost per cubic foot gets tricky. A 1.5 yd3 order may be priced as 3 yd3 by a supplier minimum. That changes the effective unit price.
| Order | Headline price | Fees or minimum | Effective cost per usable ft3 |
|---|---|---|---|
| 1.5 yd3 ready-mix | $165/yd3 | $125 delivery | $9.20 |
| 1.5 yd3 ready-mix | $165/yd3 | 3 yd3 minimum + $125 | $15.31 |
| 90 80 lb bags | $6.50/bag | no delivery shown | $10.83 |
| 120 60 lb bags | $5.25/bag | no delivery shown | $11.67 |
Use the Minimum Concrete Delivery Order and Concrete Short Load Fee guides when the order is small.
When cost per cubic foot helps
| Use case | Why this metric helps |
|---|---|
| Comparing bag sizes | Smaller bags may cost more per cubic foot. |
| Comparing bags vs ready-mix | Converts different selling units into one unit. |
| Checking small-load delivery | Minimums can raise effective unit cost. |
| Reviewing contractor bids | Separates material math from installed scope. |
| Estimating leftovers | Helps price extra bags or ordered waste. |
Do not use cost per cubic foot as the only decision. Access, placement speed, crew size, finish timing, and risk can be more important than unit material cost.
FAQ
How many cubic feet are in a cubic yard of concrete?
There are 27 cubic feet in one cubic yard. Divide price per cubic yard by 27 to estimate the ready-mix price per cubic foot before delivery and fees.
How do I calculate bag cost per cubic foot?
Divide the bag price by the bag yield in cubic feet. For example, a $6.50 bag with 0.60 ft3 yield costs about $10.83 per ft3.
Is ready-mix always cheaper per cubic foot?
Not always. The headline ready-mix unit price is often lower, but delivery, minimum-load, short-load, tax, and wait-time fees can raise small-order cost.
Should contractor bids be compared per cubic foot?
Only for a material check. Installed bids should also be compared by scope: base, forms, reinforcement, labor, finish, access, cleanup, and warranty.
Is this a final price quote?
No. It is a planning conversion. Confirm actual product yield, delivered price, access, and local requirements with a qualified local professional.
Next step
Estimate yards in the Concrete Slab Calculator, convert material in the Concrete Cost Calculator, and document bid lines with the Concrete Proposal Kit.
Quote planning next step
Turn this guide into a concrete buying check
Run the matching calculator, then compare ready-mix, bagged concrete, delivery fees, access needs, and quote gaps before you buy materials or approve a contractor number.