Calculate the volume of concrete needed for a slab, footing, or wall, along with an estimated number of concrete bags.
This tool calculates the volume of concrete required for a slab based on its length, width, and thickness, plus an estimated number of pre-mixed bags needed.
Volume equals length times width times depth (converted to meters). Bag estimate assumes a standard yield of approximately 0.017 cubic meters per 50kg bag.
Enter the length and width in meters, and the depth or thickness in centimeters, then click Calculate.
Example: A 5m by 3m slab at 10cm thickness requires 1.5 cubic meters of concrete, roughly 88 standard 50kg bags.
Should I add extra for wastage. Yes, it's common practice to add 5-10% extra to account for spillage and uneven ground.
What thickness should I use for a driveway. Residential driveways typically use 10-15cm thickness, while heavier use areas may need more.