This concrete estimator is for knocking up concrete on site. The results are in 25kg bags of cement and 850kg or 25kg of all-in ballast. This is my first attempt at this, it’s not very pretty but then we don’t need it to be. I haven’t allowed for any shrinkage by adding water, but I also haven’t given the cement any volume contribution.
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Enter length, width and depth in meters to calculate volume, then adjust the wastage slider and choose your mix ratio. If you’re unsure of what strength to pick, look at my Ultimate Concrete Mixing Guide.
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