How to use it
- Enter length, width, and thickness in the fields provided.
- Click the Calculate button.
- Read the cubic yards, cubic feet, and bag count results.
This calculator turns the dimensions of your cement‑gravel‑sand mix into the exact volume you need, shown in both cubic yards and cubic feet. It then tells you how many standard 80‑lb bags are required, using the industry‑standard yield of 0.6 cubic feet per bag. Knowing the volume helps you budget material costs, avoid ordering too little, and plan delivery logistics. The results are instant, so you can compare different slab sizes or thicknesses in seconds. Use the cubic‑yard figure when quoting suppliers, and the bag count to schedule purchases. The tool is free, requires no account, and works on any device.
Pro tips
- Add a small extra allowance for spillage or settling.
- Round the bag count up to the next whole bag.
- Compare the cubic‑yard result to supplier quotes for best pricing.
- Double‑check thickness units (inches vs. feet) before calculating.
Real-life examples
- Homeowner estimating concrete for a new patio.
- Contractor pricing a driveway slab for a client.
- DIYer planning a garden edging project.
Case study
Mike needed 2 × 4 ft patio slabs 4 in thick. Using the calculator he saw he required 0.3 cubic yards, which translated to 5 bags of mix. He ordered 6 bags, avoided a short‑fall, and completed the patio on schedule.