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Hi @GregTsoi,
As mentioned above, I'd certainly encourage you to check with the helpful team at your local store's Special Order counter. In metro locations, we offer bulk deliver of many types of decorative stones and it would be the most budget-friendly option to have 1 ton delivered.
Mitchell
Welcome to the Bunnings Workshop community @Katwiz. It's a pleasure to have you join us, and many thanks for your question about calculating quantities.
There's no one formula as depending on the size of the stone or pebble, more or less will fit in a certain area. If you can let us know the square metres of the area and the depth at which you want to fill, I can help you work out the needed quantity.
As a rough guide though, if you're aiming for a 50mm deep layer, you’ll need about 8 x 10kg bags per square metre.
To estimate the number of bags, you can use this quick calculation:
Square metres x 8 = number of 10kg bags needed at 50mm depth.
Please let me know if you have any questions.
Mitchell
