Roof Pitch Calculator | Roof Slope and Angle Calculator - Lceted -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

## Jul 18, 2022

Roof Pitch Calculator

Roof pitch is a measure of the slope (slant) of your roof. Roof pitch is calculated from the ratio of its horizontal span or "run" to the vertical rise of the roof.

It is one of many important elements of your roof, and the pitch of the roof is one of the most visible aspects of the roof. It is a measure of the steepness of a roof or its slope.

Generally, the slope range of the roof pitches falls between 4/12 and 9/12.

Pitches less than 4/12 have a slight angle and are considered as low slope roofs.

Pitches less than 2/12 are defined flat roofs, even if they are at a very small angle.

ROOF PITCH CALCULATION IN MKS

ROOF PITCH CALCULATION IN FPS

ROOF PITCH CALCULATION

Roof pitch = Rise (S) / (Run (N)/12)

Slope = (Rise (S) / (Run (N)) x 100

Angle = Tan-1 (Rise (S) / (Run (N))

TYPES OF ROOF PITCH

Low Roof Pitch/Slope

This type of roof has a minimum pitch of 3:12, meaning a roof rises 3 feet for every 12 feet of its base horizontal length (no more than 5:12). Roof: This type of roof is considered "walkable", and the roof is easy to install.

Medium Roof Pitch/Slope

This type of roof falls within the 6:12 - 9:12 roof slope range. Roof: These roofs with intermediate pitch / average slope roofs are considered "unwalkable" because they represent more complexity and are therefore more expensive to install. Roof installation requires special equipment such as roof jacks and planks.

High/Steep Roof Pitch/Slope

Roofs of this type have a slope of no more than 9 inches for every foot of horizontal roof. Roof: A high slope roof is, perhaps, the most difficult and dangerous roof surface to work on. Expect to pay more for this type of roof per square meter of installation. Any roof and especially steep roofs requires the use of special safety and fall prevention equipment.

Note: This calculation tool was developed with great care. However, we cannot be held responsible for its liability.

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