Order the right amount of concrete. Use our concrete calculator below to help determine how much concrete you may need. Be sure to make a 10% allowance for uneven sub-grade, spillage, etc. and round up to the closest 1/2 yard. Let us know what you are pouring (flatwork, wall, slab on grade, etc.) If you think a job may need more concrete, tell us up front. It’s always easier to cancel trucks than to add more.