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1 Yard Of Concrete Weight Calculator

Calculate your exact concrete volume in cubic yards, cubic feet, and 80-lb bags instantly for free to prevent costly project delays.

  • Free
  • No sign-up
  • Instant results

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How to use it

  1. Enter your slab length in feet.
  2. Enter your slab width in feet.
  3. Enter your pour thickness in inches.
  4. Review your required cubic yards, cubic feet, and total 80-lb bags.

Running out of concrete mid-pour ruins slabs and burns cash. This tool converts your project dimensions into exact cubic yards, cubic feet, and 80-lb bag counts so you order the right material the first time.

Small jobs usually rely on pre-mixed bags, while larger foundations require a ready-mix truck delivery. Knowing your exact numbers eliminates guesswork at the store or dispatch plant.

Here is how to interpret your output:

  • Cubic Feet: Your total raw volume based on length, width, and thickness.
  • Cubic Yards: The industry-standard metric used by ready-mix suppliers for truck orders (1 cubic yard equals 27 cubic feet).
  • 80-lb Bags: The precise count of pre-mixed bags needed, calculated from the standard yield of 0.6 cubic feet per 80-lb bag.

Use these figures to lock in material budgets, coordinate transport, and avoid paying extra delivery fees for emergency secondary pours.

Pro tips

  • Add 10% extra volume to your order to account for uneven subgrade, spillage, and form deflection.
  • Always round up to the next full 80-lb bag; a partial bag shortage creates weak surface seams.
  • Switch from bags to a ready-mix truck delivery once your project exceeds 1 cubic yard (45 bags).
  • Measure the actual trench or form depth in multiple spots instead of trusting the planned depth.

Real-life examples

  • Pouring a 10x10-foot backyard patio slab at 4 inches thick.
  • Setting fence posts or deck footings with individual pre-mixed bags.
  • Ordering a bulk ready-mix truck delivery for a residential driveway extension.

Case study

Marcus needed a 12x12-foot concrete patio at 4 inches thick. Guessing meant buying too many heavy bags or falling short mid-pour. He entered the dimensions, saw he needed 1.78 cubic yards (48 cubic feet, or 80 bags of 80-lb mix), and called a ready-mix truck instead. He saved $300 in bag markups and finished the pour in two hours.

Frequently asked questions

How many 80-lb bags of concrete make 1 cubic yard?
Exactly 45 bags. One cubic yard contains 27 cubic feet, and each standard 80-lb bag yields about 0.6 cubic feet (27 divided by 0.6 equals 45).
When should I order a concrete truck instead of buying bags?
Order a ready-mix truck when your project requires more than 1 cubic yard. Mixing 45 or more 80-lb bags by hand takes excessive labor and risks uneven curing seams.
How do I convert cubic feet to cubic yards?
Divide your total cubic feet by 27. For example, a 54 cubic foot pour equals 2 cubic yards.
How much extra concrete should I add for waste?
Add 10% to your calculated total for standard slab forms, and up to 15% for rough ground or unformed trenches.
Does thickness in inches need conversion before calculating volume?
Yes. Thickness must be divided by 12 to convert inches to feet before multiplying by length and width. This tool handles that calculation automatically.