Roof gutter bracket count calculator

Calculate bracket positions by run and total brackets with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use bracket positions by run and total brackets to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Independent gutter run lengths (m)
8,6
Supplied maximum bracket spacing (m)
0.8
Additional fitting-specific brackets (count)
2
Bracket positions by run (m)
[[0,0.8,1.6,2.4,3.2,4,4.8,5.6,6.4,7.2,8],[0,0.75,1.5,2.25,3,3.75,4.5,5.25,6]]
Total brackets
22

Try another scenario

Independent gutter run lengths (m)
8,6
Supplied maximum bracket spacing (m)
0.6
Additional fitting-specific brackets (count)
2
Bracket positions by run (m)
[[0,0.571428571429,1.14285714286,1.71428571429,2.28571428571,2.85714285714,3.42857142857,4,4.57142857143,5.14285714286,5.71428571429,6.28571428571,6.85714285714,7.42857142857,8],[0,0.6,1.2,1.8,2.4,3,3.6,4.2,4.8,5.4,6]]
Total brackets
28
Calculation method

Calculation method

Bracket positions by run (m)

J([[round(i*v/ceil(v/b),12) for i in range(ceil(v/b)+1)] for v in a])

Total brackets

sum(ceil(v/b)+1 for v in a)+c

Symbols and units
a
Independent gutter run lengths (m)
b
Supplied maximum bracket spacing (m)
c
Additional fitting-specific brackets (count)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Calculation steps and notation

sum(list) adds all entries in the list.

Assumptions & limits

Assumptions & limits

  • Supports at both ends of each independent run and evenly spaced within supplied limit; additional fitting brackets supplied explicitly. Shared ends count separately. Supported limits: All numeric inputs must be finite. Only the explicitly described mathematical scenario is supported.
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