FREE · CALCULATORS & CONVERTERS
Roof Pitch and Area Calculator.
Convert roof pitch to degrees and percent, then estimate rafter length, roof area and tile count.
A gable uses half the span and two slopes. Tile count uses the exposed cover size you enter and rounds up. Leave a cover size at zero to skip tiles. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional.
- Rise
- 2.309401 m
- Run
- 4 m
- Pitch
- 57.735027 %
- Pitch
- 30 degrees
- Rafter length
- 4.618802 m
- Roof area
- 92.376043 m²
- Tiles
- 1,617
A gable uses half the span as the run and two slopes. A shed uses the full span and one slope. Rafter length is the hypotenuse of run and rise. Tile count uses the exposed cover size and rounds up.
How to use Roof Pitch and Area Calculator
Choose a shed or gable roof, enter the building length and span, and set the pitch as a ratio, degrees or percent.
How it works
Convert roof pitch to degrees and percent, then estimate rafter length, roof area and tile count. A gable uses half the span and two slopes. Tile count uses the exposed cover size you enter and rounds up. Leave a cover size at zero to skip tiles. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional.
Example
A 10 m by 8 m gable roof at 30 degrees.
Questions about Roof Pitch and Area Calculator
Is Roof Pitch and Area Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
A gable uses half the span and two slopes. Tile count uses the exposed cover size you enter and rounds up. Leave a cover size at zero to skip tiles. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.