Construction
Ramp slope and length
Calculate a ramp’s gradient, angle and sloping length from rise and horizontal run.
Calculators / Construction / Gutter run and fall
Gutter run and fall calculator
Translate a supplied gutter fall per metre into total drop and end elevation.
On this page
Total fall30mm
End elevation2,470mm
Gradient0.3%
Calculator controls
How to calculate
Translate a supplied gutter fall per metre into total drop and end elevation.
Total fall =
length*slope mmEnd elevation =
start-length*slope mmGradient =
slope/10 %Worked example
- Horizontal run (m): 10
- Chosen fall (mm per m): 3
- Starting elevation (mm): 2500
- Total fall: 30 mm
- End elevation: 2,470 mm
- Gradient: 0.3 %
Assumptions and limits
This computes geometry only. The fall is chosen by you; rainfall capacity, outlet placement, structural support and local installation rules are not evaluated.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Translate a supplied gutter fall per metre into total drop and end elevation. Multiply horizontal metres by millimetres of fall per metre. Subtract the drop from the starting elevation using the same datum.
When this tool is useful
Multiply horizontal metres by millimetres of fall per metre. Subtract the drop from the starting elevation using the same datum.
Understanding your inputs
| Input | Example |
|---|---|
Horizontal run (m) length | 10 |
Chosen fall (mm per m) slope | 3 |
Starting elevation (mm) start | 2500 |
Frequently asked questions
What does this estimate leave out?
This computes geometry only. The fall is chosen by you; rainfall capacity, outlet placement, structural support and local installation rules are not evaluated.
How do I check the example?
Use the stated units and the formula below. Keep full precision until the final answer; change one input at a time to see its effect.