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Roof Pitch Calculator

Estimate roof pitch, pitch per 12, and roof angle from rise and run.

Updated April 13, 2026
Free online tool
Planning and research use

Why this page exists

Roof pitch is easier to understand when rise and run are turned into a familiar pitch-per-12 value instead of left as raw measurements. This calculator helps visitors estimate roof pitch from rise and run and also shows the angle in degrees.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Roof pitch calculator

Estimate roof pitch, pitch per 12, and roof angle from rise and run.

Result

6.00:12

Estimated roof pitch based on rise divided by run, shown as a pitch-per-12 value and roof angle.

Pitch ratio6.00:12

Pitch per 126.00 in 12

Roof angle26.57°

Inputs used6.00 in rise over 12.00 in run

6.00 in of rise over 12.00 in of run works out to a roof pitch near 6.00:12.
That same pitch corresponds to about 26.57 degrees from horizontal.
Use the result as a quick planning number for discussions, sketches, or estimates, then verify final roof details from real site measurements.

This is a simple roof-pitch estimate, not a framing layout or engineering plan. Real roof work can still depend on site conditions, framing details, and code requirements.

Planning note

Last updated April 13, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Enter the roof rise and run using the same unit for both.

The calculator divides rise by run to find slope.

It then converts that slope into pitch per 12 and a roof angle in degrees.

Understanding your result

This is a straightforward roof-pitch estimate. It is useful for planning and comparison, but real roof work should still be verified from actual site measurements and project details.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Translate measurements into a familiar roof pitch

This can help when rise and run are known but the pitch still needs to be expressed in a more familiar format like 6:12.

Compare roof steepness quickly

A pitch-per-12 value and angle can make it easier to compare different roof sections or design ideas.

Use it with roofing and exterior planning tools

Roof pitch often fits naturally beside roofing area, gutter, soffit, or attic-ventilation planning.

FAQ

Common questions

What does pitch per 12 mean?

It shows how many units the roof rises vertically for every 12 units of horizontal run.

Do rise and run need the same unit?

Yes. The ratio only works correctly when both measurements use the same unit system.

Why show the angle too?

The degree angle can be easier to understand when you want a more geometric view of the roof slope.

Related tools

Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Home ToolsUpdated April 11, 2026