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Roof Pitch Calculator

Calculate x:12 pitch, degrees, slope percentage, multiplier, common rafter and ridge length, gable roof area, overhangs, and waste in feet or meters.

Tool statusRuns in your browser
Preview

Pitch input

Roof measurements

Results

Pitch
6:12
Angle
26.57°
Slope
50%
Slope multiplier
1.12×
Measured slope length
13.42
Common rafter length
17.89 ft
Ridge length
42 ft
Roof surface area
1,502.64 ft²
Area with waste
1,652.9 ft²

Estimate for a symmetrical gable roof. Confirm structural dimensions and local requirements with a qualified professional.

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is Roof Pitch Calculator?

Calculate roof pitch online from rise and run or degrees. Get x:12 pitch, slope percentage, multiplier, common rafter length, ridge length, and gable roof area.

UNDERSTAND THE TOOL

How to calculate roof pitch

Convert rise and run or an angle into x:12 pitch, degrees, slope percentage, rafter length, and roof surface area.

Pitch conversions

A 6:12 pitch rises 6 units for every 12 units of horizontal run. That equals a 50% slope and an angle of about 26.57 degrees. The slope multiplier converts horizontal distance into sloped distance.

Roof area

For a symmetrical gable roof, the calculator adds eave and gable overhangs, calculates both roof planes, and then applies the selected waste allowance.

How to use it

  • Enter measured rise and run, or switch to an angle.
  • Choose feet or meters and enter building dimensions.
  • Add eave and gable overhangs.
  • Review pitch, rafter, ridge, area, and area with waste.

Calculated locally

All roof dimensions and calculations remain in your browser and are never uploaded.

Frequently Asked Questions

What does 6:12 roof pitch mean?

The roof rises 6 units for every 12 units of horizontal run. The units can be inches, centimeters, or any consistent measurement.

Does roof area include both sides?

Yes. The area result covers both planes of a symmetrical gable roof, including entered overhangs.

Can I use the result to cut structural rafters?

Use it as an estimate only. Cuts, ridge thickness, structural loads, codes, and field conditions require project-specific verification by a qualified professional.

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