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Say you've got a compost heap, 1 full metre cube, with about 1 part green to 3 parts brown by volume. If this is left to break down, what volume of compost will be produced?

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In my (extensive) experience, between a quarter and a third of the original volume, usually a quarter - and the ratio of green to brown should really be kept as close as possible to 50/50.

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  • Oh I though the 50/50 was by weight, which is roughly 25/75 by volume due to the greens' water content.
    – GC.
    Jun 18, 2015 at 10:05

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