Landscaping & Boundaries

Fencing calculator

Estimate fence panels, posts and optional gravel boards from boundary length, gate openings and panel width.

Transparent formulaFormula v1.0 · net boundary run ÷ panel width; posts and gravel boards follow panel spans

02Materials estimate

Enter measurements to calculate.

Calculated requirement → waste allowance → recommended order → purchasable units

Net fence run—

Panels required—

Minimum posts—

Gravel boards—

Formula v1.0 · net boundary run ÷ panel width; posts and gravel boards follow panel spans · Round purchasable units up to a whole pack, bag or unit where selected.

No account or cloud storage — a saved draft stays in this browser.

Project / reference optional Notes for a merchant optional

Early access

Check supplier pricing

Supplier pricing is being prepared. Create the list first, then use it to ask a local merchant for price, stock, delivery and lead time. No contact details or measurements are sent.

Next steps

Product options · Not connected

Buy what you need

Product options are not connected. Use the calculated list with the product details you choose.

Compare merchants · Not connected

Compare merchants

Merchant prices, availability and comparison data are not connected.

Professional quote option · Not connected

Get professional quotes

Quote routing is not available. Create a quote-ready materials list to discuss with a merchant.

Scope boundary: Materials list only — it does not confirm a boundary line, post depth, stability design or planning decisions.

Check the path

Your calculation audit

Every total is shown as a short sequence so you can see what was measured, deducted, adjusted and rounded.

01
Awaiting valid measurementsComplete the fields above to reveal the formula path.
—

Measure clearly

Simple guidance

Measure the intended fence line from end post to end post. Deduct the widths of gates or any clear section that will not take a panel, then enter the actual panel width you plan to buy.

Measure the finished surface or internal clear dimensions. Keep a note of any deduction you make.

Worked example

Follow the same logic

An 18 m boundary with a 1 m gate opening leaves 17 m. With 1.83 m panels, this needs 10 spans, 11 minimum posts and 11 panels after a 5% panel allowance.

Planning tipWrite down the product factor or pack size you used, so a later change is easy to trace.

Before you buy

Three quick checks

01
Measure the intended fence run, rather than assuming a property boundary.
02
Deduct each gate or deliberate clear section once.
03
Confirm actual panel widths, post types, corner/end conditions and gravel-board lengths with the merchant.

Quick answers

Useful to know

Why is there one more post than panel spans?

A straightforward run needs an end post at both ends, so the minimum post count is the calculated number of panel spans plus one. Corners, changes in direction and gates may need additional posts.

Does this tell me how deep to set the posts?

No. This is a material-list estimate only. It does not set post depth, stability, ground conditions, boundary rights or planning decisions.

Review record

Transparent calculation method

Last reviewed: 2026-10-17. Formula version: v1.0. Classification: fence-material estimate.

Formula source: src/calculator.js. Uses visitor-entered measurements and product values.

Read methodology