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Concrete Price Per Yard Calculator

Calculate concrete cubic yards, estimated cost, bags, and cubic feet instantly from your slab dimensions and price. Free and easy.

  • Free
  • No sign-up
  • Instant results

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How to use it

  1. Enter the slab length and width in feet
  2. Enter the thickness in inches
  3. Enter the price per cubic yard you pay
  4. Click calculate to see cubic yards, cost, bags, and cubic feet

This calculator turns your slab dimensions and local concrete price into the exact numbers you need before ordering. Enter length, width, and thickness in inches, plus the price per cubic yard, and it instantly shows cubic yards, estimated cost, number of 80-lb bags, and cubic feet.

Why this matters: concrete is sold by the cubic yard, but most people measure in feet and inches. A small math error can mean ordering too little (disaster) or too much (wasted money). This tool removes that guesswork. It also tells you how many standard 80-lb bags you'd need if you mix your own—each bag yields about 0.6 cubic feet, so the calculator uses that exact constant.

Read the results this way: cubic yards is what you order from a ready-mix truck; estimated cost is your total before tax; bags tells you bag count for small jobs; cubic feet helps compare with other suppliers. Use it before every pour.

Pro tips

  • Add 5–10% waste allowance to your final yardage to cover spillage, uneven subgrade, or slight over-dig
  • Always round up to the next full cubic yard when ordering ready-mix—trucks don't deliver partial yards
  • For small slabs under 1 yard, buying 80-lb bags is often cheaper than a delivery fee—check the bag count
  • Double-check thickness in inches; a 4-inch slab vs 6-inch changes yardage by 50%—a common mistake

Real-life examples

  • Pouring a backyard patio slab and need to know how much ready-mix to order
  • Estimating concrete cost for a driveway replacement to compare against a contractor quote
  • Planning a small shed foundation and deciding whether bags or delivery is more economical

Case study

Jake measured his 10x12 patio at 4 inches thick. He entered the numbers and a $110-per-yard quote. The calculator showed 1.48 cubic yards, about 67 bags, and a $163 cost. He added 10% waste, ordered 1.7 yards, and finished with no extra trips—and no leftover concrete wasted.

Frequently asked questions

How many 80-lb bags are in a cubic yard?
One cubic yard is 27 cubic feet. Since each 80-lb bag yields 0.6 cubic feet, you need 45 bags (27 ÷ 0.6).
Should I order by the bag or by the yard?
For anything under 1.5 cubic yards, bags are usually cheaper and easier. For larger jobs, ready-mix delivery is more practical and less labor-intensive.
What is a good waste allowance to add?
Add 5–10% for most slabs. For uneven ground or complex shapes, use 10–15% to avoid running short.
How do I convert thickness in inches to feet?
The calculator does it for you. But if you want to check, divide inches by 12—for example, 4 inches is 0.333 feet.
Can I use this for a round or curved slab?
This calculator works for square or rectangular slabs. For round areas, measure the diameter and treat it as a square, then subtract about 22%—or use a dedicated round calculator.