How much concrete do I need for fence posts?
For setting fence, deck, or mailbox posts. Get bags of fast-setting or regular concrete.
Fast-setting (50 lb)
25 bags
Estimated material cost
Fast-setting
25 x $$7.00 per 50 lb bag
$175
Typical store prices before tax and delivery. Change any price to match your store.
How to measure
Count the posts, and decide the hole diameter and depth.
Tips from the field
- Holes should be about three times the post width and a third of the post length deep.
- Put a few inches of gravel in the bottom of each hole for drainage.
What you'll need
Common questions
How big should a post hole be?
About three times the width of the post, so 10 to 12 inches for a 4x4.
How much concrete per fence post?
About two 50 lb bags of fast-setting concrete for a typical 4x4 in a 10 inch hole, 2 feet deep.
Should I put gravel under posts?
Yes, a few inches of gravel helps water drain away from the bottom of the post.
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