ONE CLEAR BAY · EQUAL SPACING

Picket spacing
calculator.

Start with the clear opening and actual picket width. Choose a maximum gap or a count you already have, then see the gaps, positions and exact bay closure.

Free · no accountmm / cm / m / inPrint or download

Decorative spacing arithmetic only. This is not a fencing, pool-safety, structural or building-compliance assessment. The tool does not recommend a gap, product or installation method.

01 / YOUR BAY AND PICKETS

Use the dimensions in your own plan.

The clear bay is the space between the two boundaries represented in this model. All pickets are assumed to have the same actual width.

Clear bay width

Bay units

Actual width per picket

Picket units

What do you want to solve?

Your chosen maximum gap

Gap units

The tool finds the fewest whole pickets that keep every modelled gap at or below this value. Zero is valid only when pickets exactly fill the bay.

End treatment

Equal ends gives N + 1 gap intervals. No end gaps gives N − 1 internal intervals. Neither option is a recommendation.

Show results in

Changing result units converts the plan; it does not change or round your entered measurements.

Enter decimals with up to six decimal places, without commas or fractions. Each length is limited to 1,000,000 mm or its equivalent. Calculations use exact converted decimals; only displayed values are rounded.

Calculator arithmetic runs in this page. Privacy and site services.

Enter your measurements to create a plan.

02 / YOUR SPACING PLAN

Counts, gaps and closure.

—whole pickets in the bay

—equal gap size

—gap intervals, including selected ends

—start-to-start pitch where repeated

Exact bay closure

Exact fractions and the closure check

Gap in selected result units
Each end gap
Width occupied by pickets
Width occupied by gaps

Displayed decimals are rounded to six places; very small positive results show a less-than value. Repeating fractions stay exact in the model. Multiplying a rounded gap can produce a different total.


Picket	Start from near boundary	Centre	End from near boundary

Positions are rounded for display in the selected result unit. The downloaded plan includes exact fractions for every position. Picket lengths and cutting instructions are not calculated.

More gaps changes the count.

With equal end gaps, the remainder is shared by two more intervals than a layout whose outer pickets are flush to the boundaries. That changes the maximum-gap calculation.

Compare both end treatments →

A maximum is not always the result.

Whole pickets cannot be split into fractional counts. The solved gap can be smaller than the maximum you chose, and some combinations have no exact solution.

See the count formula →