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If a result does not match what your supplier quoted, tell us which calculator, what you entered, and what figure you expected. Every constant these calculators use is published onhow we calculate with the source it came from, so a disagreement is usually quick to settle — and if the source is wrong, we want to know.

We cannot size a slab, specify reinforcement, or advise on a structural question. Those need an engineer or your local building department. What we can do is explain exactly where a number came from.

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