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.
The material sets the commonly accepted minimum pitch; raise it here if you want a steeper roof.
The section is drawn to scale from your selected dimensions.
Regulatory note: the ridge may not exceed 5.00 m (art. 40/4); roof pitch is measured from the eaves (40/3) and is set with the approval of the local authority (40/2). Official text: Official Gazette 03.07.2017/30113
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Let's design your roof together based on your plot's real rainfall/wind conditionsThis 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. These ranges are common practice, not a regulatory value: under Article 40/2 of the Planned Areas Zoning Regulation, the relevant authority sets roof pitch according to the material, the architectural character of the locality and the climate; for the binding minimum, check the manufacturer's installation specification of your chosen product and your municipality.
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.
Does a metal roof need snow guards?
This follows directly from the pitch choice the tool illustrates. A metal roof looks attractive because it works at a lower pitch, but its surface is far smoother than tile: snow that builds up on it can release in a single mass, suddenly, as the temperature rises. In a snowy region like the Black Sea coast the place it lands is usually the entrance canopy, the parking area or a walkway, and that is where it becomes a safety problem. Snow guards stop the snow from shedding in one mass and let it melt gradually. Whether you need them depends on the roof pitch, the covering, what sits below the eaves and the region's snow load; spacing and capacity come from the manufacturer's data, so we do not quote a single figure here. If you are considering a lower pitch with a metal covering, treat snow guards as part of that decision rather than an accessory to be added later.