Roof Slope Calculator

Whether you need to know your roof slope angle, rise/run ratio, percentage or even length our online roof slope calculator will present you with accurate results every time.

Roof Slope Calculator

Unit of Measurement Feet Metres

Vertical Rise

Horizontal Run

Calculate

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How to Use

1. Unit of Measurement: Choose whether you will be entering measurements in feet or metres.
2. Vertical Rise (V): Input the vertical height of the roof from the base to the peak.
3. Horizontal Run (H): Input the horizontal distance from the edge of the roof to the point directly below the peak.
4. Calculate Slope: Press the "Calculate" button to compute the slope of your roof.

Calculator checked on December 17, 2024 By Jamie

The Results

The results will include:

• The slope as a ratio (Rise/Run), showing the vertical rise for every unit of horizontal run.
• The slope in degrees, indicating the angle of the roof relative to the horizontal plane.
• The slope as a percent, representing the vertical rise per 100 units of horizontal run.
• The slope length, which is the diagonal distance from the edge of the roof to the peak.

Adjusting Measurements: If you want to try different measurements, simply change the numbers in the input fields and click "Calculate" again.

Uses

• Construction and Roofing Professionals: accurately determine roof slopes for new constructions, renovations, or repairs.
• Architects and Designers: ensure that roof slopes are aesthetically pleasing, functional, and compliant with zoning laws and energy efficiency standards.
• DIY Homeowners: understand their roof's slope when adding extensions, installing solar panels, or conducting minor repairs.
• Real Estate Professionals: provide accurate information about a property's roof slope, which can be a crucial factor in assessing a home's value, functionality, and curb appeal.
• Educational Use: understand the mathematical principles behind roof designs and to apply theoretical knowledge in real-world scenarios.
• Solar Panel Installation: determine the optimal angle for solar panels based on the roof's slope, maximising energy efficiency and solar gain.
• Rainwater Harvesting: design more efficient rainwater harvesting system that takes into account the flow of water for optimal collection and storage.
• Snow Load Assessment: assess a roof's ability to shed snow and reduce the risk of overload.
• Wind Resistance: aid in designing roofs that minimise wind uplift and damage in wind-prone areas.
• Energy Efficiency: evaluate how changes to a roof's slope might improve air circulation and insulation, contributing to more energy-efficient homes.