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Fence Calculator
Calculates fence posts, sections, rails, pickets and the concrete each post hole takes, from the run length, height and post spacing.
Calculators
Nothing uploaded
No sign-up
Free, unlimited
Inches when the units are feet, millimetres when they are metres.
Leave at 0 for a third of the height, or set your frost depth.
Set to 0 for panel fencing with no pickets.
Enter your figures and press Calculate.
In short
Fence Calculator is a free online tool on inputtesthub.com that calculates fence posts, sections, rails, pickets and the concrete each post hole takes, from the run length, height and post spacing. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Fence Calculator
- Enter the total run, the height and the post spacing you want.
- Add gates and corners, which each need their own post.
- Set the post width so the hole and concrete figures are right.
- Check the burial depth against your local frost line before ordering posts.
About the Fence Calculator
The Fence Calculator calculates fence posts, sections, rails, pickets and the concrete each post hole takes, from the run length, height and post spacing. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Ordering posts, rails and concrete for a garden fence in one go.
- Working out how deep the posts have to go and how long to buy them.
- Checking a fencing quote against the materials it actually needs.
Details
| Post spacing | 6–8 ft is normal; 8 ft is the usual limit for a 6 ft fence |
|---|---|
| Burial depth | A third of the post length, and never above the frost line |
| Hole width | Three times the width of the post |
| Premix yield | An 80 lb bag makes about 0.6 ft³; a 25 kg bag about 0.0125 m³ |
| Posts | Sections plus one, plus an extra for every gate and every corner |
The maths behind it
This tool uses sections = fence run ÷ post spacing rounded up, posts = sections + 1 + one per gate and per corner, and concrete per hole = the volume of a cylinder three post-widths across less the post itself. Every intermediate value is shown on screen, so the result can be checked by hand.
The post length this returns is the height plus the burial depth, which is what you buy — a common and expensive mistake is ordering 6 ft posts for a 6 ft fence. Concrete quantities assume a plain cylindrical hole and no allowance for the gravel most people put in the base for drainage.
Where this tool stops
Models a straight run with a stated number of corners. Sloping ground, stepped panels, retaining sections and fences that follow a curve all need more material than this predicts, and none of them are modelled.
Frequently asked questions
How deep should a fence post go?
A third of the total post length is the usual rule, so a 6 ft fence wants a 9 ft post with 3 ft in the ground, or an 8 ft post with 2 ft if the ground is firm and sheltered. Where the ground freezes, none of that matters as much as the frost line: a post whose base sits above it will be lifted a little every winter until the fence leans.
Why does the spacing come out different from what I entered?
Because the tool rounds the number of sections up and then divides the run evenly between them. Eleven equal spans look deliberate; ten full spans and a two-foot stub at the end look like a mistake, and they cost the same.
Do I need concrete for every post?
Gate posts and end posts, yes — they take all the leverage. Line posts in firm, well-drained ground can be set in compacted gravel instead, which drains better and is far easier to remove when the fence is replaced. In soft or waterlogged ground, concrete everything.
Is the Fence Calculator free, or is there a paid tier?
It is free, with no account, no trial and no daily cap. Every calculators tool on inputtesthub.com works the same way: open the page and use it.
Is what I paste into the Fence Calculator stored?
No. The Fence Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What is the equation behind the Fence Calculator?
It uses sections = fence run ÷ post spacing rounded up, posts = sections + 1 + one per gate and per corner, and concrete per hole = the volume of a cylinder three post-widths across less the post itself. The full working is printed under the result, so you can follow every step rather than trusting a black box.
When would I actually need the Fence Calculator?
The most common reasons people reach for it: ordering posts, rails and concrete for a garden fence in one go. Working out how deep the posts have to go and how long to buy them. Checking a fencing quote against the materials it actually needs. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything the Fence Calculator cannot do?
Models a straight run with a stated number of corners. Sloping ground, stepped panels, retaining sections and fences that follow a curve all need more material than this predicts, and none of them are modelled. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What figures does the Fence Calculator work from?
Post spacing is 6–8 ft is normal; 8 ft is the usual limit for a 6 ft fence. Burial depth is A third of the post length, and never above the frost line. Hole width is Three times the width of the post. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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