About this calculator
A complete gutter takeoff: sections, brackets, end caps, outlets, corners and the downpipes with their bends and clips.
How it’s calculated
Each run gets enough outlets that no length of gutter exceeds your maximum per outlet. Brackets go every 1 m, closer in snowy areas. The number of drops follows the eaves height.
Worked example
With these inputs:
- Total eaves length
- 30 m
- Separate gutter runs
- 2
- Corners (inside or outside)
- 0
- Eaves height
- 2.6 m
- Max gutter length per outlet
- 12 m
the result is:
- Gutter lengths
- 8 × 4 m
- Outlets / drops
- 4
- Brackets @ 1 m
- 32
Tips from the trade
- Fall toward the outlet: around 1:350 to 1:600, or 3 mm per metre.
- Put outlets near valleys, which dump a lot of water.
- Add a corner fitting for every change of direction.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and the Building Regulations before ordering.