This is a terrific concrete slab calculator for estimating how much concrete to order to complete your concrete slabs, concrete floors, concrete walls, and concrete footings. Just remember to add some extra concrete to your total order because running short is not an option.
Calculator courtesy of the concretenetwork.com
When estimating the amount of concrete for your concrete slab, it's important to check the level of the subgrade and come up with an average thickness.
Most of the jobs I check, the dirt grade is rarely level. Using a laser level this can be done quite easily.
I use a laser level that self-levels itself when you turn it on, that way you can be sure the readings you get are accurate.
For a grade stick I use a long, narrow piece of wood with a yard stick attached to it. Using the yard stick allows me to be accurate to within 1/16 of an inch if I want to.
I usually spray paint the numbers I get from moving the receiver up and down on the yard stick, right onto the dirt, when I check the dirt grade.
This helps me remember how level or un-level the dirt is graded. I take many readings on the sub-grade depending on how big the area is. Once I've covered the entire area, I can average the numbers together to get a final reading.
Once I've determined the average grade of the dirt, I can set the finish concrete floor grade up 4, 5, or 6 inches from that depending on how thick I want my concrete floor.
If you make a mistake and don't order enough concrete just call the concrete dispatcher and he will send another concrete truck with the balance on it.
But be prepared to wait if the concrete company is busy and doesn't have a truck waiting.
After using the concrete calculator to figure the exact amount of concrete, I usually order anywhere from a half yard to a full yard extra, depending on how the subgrade is prepared.
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That's us Pumping a slab!