Roof Pitch Calculator
Pick your roofing material and building width, and see the recommended minimum pitch percentage, angle and matching ridge height for a high-rainfall climate like the Black Sea coast.
This is a rough illustration assuming the building width you entered is covered by a symmetrical gable roof; hip roofs, mono-pitch roofs, gutter/downspout capacity and valley details are not included in this calculation — these are separate, project-specific technical decisions.
Why does roof pitch depend on the material?
In most regions, roof pitch is largely an aesthetic choice — but in a high-rainfall climate like the Black Sea coast, it's a technical minimum that the chosen roofing material needs in order to perform correctly. Insufficient pitch on overlapping systems like tile roofing can let wind-driven rain seep in under the covering.
The tool above shows the commonly accepted minimum pitch percentage for your chosen material, its angle equivalent, and — assuming a symmetric gable roof — the ridge height that corresponds to the building width you enter.
Minimum pitch ranges by material
Tile roofing (Marseille/Ottoman-type) commonly needs a minimum pitch of 33-40%; metal/sheet roofing can work with 15-25%, and shingle (bitumen tile) roofing with 20-30%. On flat or green roofs, the goal isn't pitch but drainage — a very shallow 2-5% pitch is enough to prevent standing water.
In high-rainfall regions, values near the top of these ranges are preferred; the tool therefore uses a safe minimum close to the upper end of the range for every material.
What this doesn't cover
This tool is a conceptual model that assumes the entire building width you enter is covered by a single symmetric gable roof; hip roofs, single-pitch roofs or more complex roof geometries, gutter/downspout capacity calculations and valley details are all separate, project-specific technical decisions not included here.
MEEZ Mimarlık determines your roof pitch and rainwater drainage system to match your chosen roofing material and your plot's actual rainfall and wind conditions.
Contact usFrequently Asked Questions
What's the minimum pitch for a tile roof?
Tile roofing (Marseille/Ottoman-type) commonly needs a minimum pitch in the 33-40% range (roughly 18-22°). In high-rainfall regions like the Black Sea coast, values near the top of this range are preferred.
Why can metal/sheet roofing work with less pitch?
Metal sheet roofs use seamless or welded/interlocking joints rather than overlapping courses, so they can perform adequately against water at a lower pitch (commonly 15-25%) than overlapping systems like tile.
How is ridge height calculated?
The tool assumes the building width you enter is covered by a symmetric gable roof: ridge height ≈ (building width / 2) × pitch ratio. This is a conceptual model — actual roof geometry varies by project.
Does this tool also calculate gutter and downspout capacity?
No. The tool only shows the relationship between pitch and ridge height; gutter/downspout capacity needs to be calculated separately based on roof area and the region's rainfall intensity, as a project-specific decision.