Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Roof Pitch Calculator

Convert between rise-over-run pitch (X-in-12), degrees, and slope percentage. Includes rafter-length multiplier for figuring out material lengths.

You have

Rise (for X-in-12) (in per 12 in)

Angle (°)

Slope % (%)

Fill in the required fields to see your result.

Construction

Roof Area Calculator

Calculate the true sloped surface area of a roof from its footprint dimensions and pitch angle. The slope multiplier (1/cos(pitch)) corrects for the fact that a pitched roof has more material area than the horizontal footprint it covers.

Roof Length (m)

Roof Width (m)

Roof Pitch (degrees)

Fill in the required fields to see your result.

Key differences

	Roof Pitch Calculator	Roof Area Calculator
Category	Construction	Construction
Inputs required	4	3
Result	Roof angle (°)	Roof Surface Area (m²)
What it does	Convert between rise-over-run pitch (X-in-12), degrees, and slope percentage. Includes rafter-length multiplier for figuring out material lengths.	Calculate the true sloped surface area of a roof from its footprint dimensions and pitch angle. The slope multiplier (1/cos(pitch)) corrects for the fact that a pitched roof has more material area than the horizontal footprint it covers.