Bags Needed
How much concrete, mulch, gravel or soil to buy
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Concrete
How many bags of concrete for slabs and fence posts.
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Length (ft)
Width (ft)
Depth (in)
Bag
80 lb bags
60 lb bags
50 lb bags
40 lb bags
cubic feet
cubic yards
bags (incl. 10% extra)
4x4 slab
4x8 slab
6x6 slab
8x8 slab
8x10 slab
10x10 slab
10x12 slab
12x12 slab
10x20 slab
12x16 slab
12x20 slab
16x16 slab
20x20 slab
24x24 slab
Post: 8" hole, 24" deep
Post: 10" hole, 24" deep
Post: 10" hole, 30" deep
Post: 10" hole, 36" deep
Post: 12" hole, 36" deep
Post: 12" hole, 42" deep