Roof Pitch Calculator
Roof pitch (or slope) is described three ways — in degrees, as a rise-in-12 ratio (like 4:12), and as a percentage. Set the pitch to convert between all three, see the slope (area) factor, and check which roof shape and covering it suits.
The comfortable range for clay/concrete tiles in most of India.
Know the rise & run instead?
Enter how much the roof rises over a given horizontal run to get the pitch.
A 22° roof rises 4.8 units for every 12 of horizontal run.
The true sloped roof area is 1.079× the plan footprint at this pitch. Use the Roof Area Calculator to turn that into material quantities.
A planning aid. Minimum pitches depend on the covering and the manufacturer’s instructions (small clay tiles typically need a steeper pitch than large metal sheets), and on your rainfall. Always confirm the minimum pitch for your chosen product, and leave the roof’s structural design to a qualified engineer.
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Squeezing the most usable area from a plot — the efficiency ratios, hunting dead space, using setback margins well, going vertical and multi-use, and the honest efficiency-versus-liveability balance
Site PlanningRelated Tools — You may also find these useful
Rainwater Harvesting Calculator
How much rainwater your rooftop can harvest in a year, in litres and kilolitres, from the roof area, your city's rainfall and roof type — with a suggested storage-tank size.
RoofingRoof Area Calculator
The true (sloped) surface area of a roof from its plan footprint and pitch, in m² and sq ft, with a wastage allowance and rough tile/sheet/coating counts — the area you actually buy roofing materials for.
RoofingRoof Heat Gain Calculator
How much heat your roof lets in and how much insulation cuts it — heat gain in watts and the AC tonnage it adds, from roof construction (U-value), area and temperature difference, versus a bare slab.
Roofing