Deck Post Concrete
Estimate the concrete needed to set deck posts.
About Deck Post Concrete
The concrete around a post is the difference between the round hole volume and the post's own volume. Multiplying by the number of posts gives the total pour. Concrete secures each post against movement, so estimating the fill volume per post tells you how many bags to buy.
Formula
Deck Post Concrete
Concrete/post = hole volume - post volume
- hole
- The round excavated hole for one post
Worked example
With the default values below, Deck Post Concrete returns Concrete Needed of 0.37. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Number of postsminimum 1
- 6
- Hole diameterminimum 1 in
- 12 in
- Hole depth
- 2.5 ft
- Post widthminimum 1 in
- 4 in
Results
- Concrete per Post
- 1.69 cu ft
- Total Volume
- 10.1 cu ft
- Concrete Needed
- 0.37 cu yd
Step by step
- 1Values used
- 2Deck Post Concrete
- 3Concrete Needed= 0.37 cu yd
- 4Concrete per Post= 1.69 cu ft
- 5Total Volume= 10.1 cu ft
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Deck Post Concrete calculated?
Concrete/post = hole volume - post volume The concrete around a post is the difference between the round hole volume and the post's own volume. Multiplying by the number of posts gives the total pour.
Why does Deck Post Concrete matter?
Concrete secures each post against movement, so estimating the fill volume per post tells you how many bags to buy.
What values do I need to enter?
This calculator takes 4 inputs: Number of posts, Hole diameter, Hole depth, Post width. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.