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Cement Concrete Aggegates of Australia published Assessing Concrete Volumes , which included quantities for mixing concrete.
This calculator implements their quantities given in Table 2.
For General purpose projects such as driveways, paths, patios.
The calculator gives quantities of sand and coarse aggregate, and all-in aggregate (meaning sand and coarse aggregate combined), use one or the other, NOT both!
Slightly more water may be needed in smaller mix quantities, but keep in mind that water weakens the mix.
The calculator above can scale the recipe, just complete one of the yellow fields and hit ENTER, and the rest will be calculated.
Concrete subject to wear (ie truck driveway).
The calculator gives quantities of sand and coarse aggregate, and all-in aggregate (meaning sand and coarse aggregate combined), use one or the other, NOT both!
Slightly more water may be needed in smaller mix quantities, but keep in mind that water weakens the mix.
The calculator above can scale the recipe, just complete one of the yellow fields and hit ENTER, and the rest will be calculated.
Fill a bucket of known size and count the shovel fulls. I know that I slightly overfill a 9l bucket with 3 medium rounded shovels of mixed aggregate, so I need to allow 3 such shovelfulls for each 10l of mixed aggregate.
Make mix quantites up with third, half or full bags for consistent quantity, depending on your mixer and quantity required.
Water weakens concrete, strength is related to the cement / water
ratio. To mix in a small mixer, I find that three quarters of the
aggregate and most of the expected water should be mixed thoroughly,
then add all the cement slowly so that it doesn't form lumps stuck to
the bowl, then add the rest of the aggregate and adjust the water,
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