Latest Version
Update
November 09, 2026
November 09, 2026
Developer
OLEKSANDR KOPAREIKO
OLEKSANDR KOPAREIKO
Categories
Tools
Tools
Platforms
Android
Android
Downloads
0
0
License
Free
Free
Package Name
com.NikfortGames.rafter_calculator
com.NikfortGames.rafter_calculator
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Report a Problem
More About Rafter Calculator: Roof Pitch
Get the length to cut and the saw angles for a common rafter from two numbers: the building span and the roof pitch.
HOW IT WORKS
1. Type the span, outside of wall to outside of wall.
2. Type the pitch as x/12 or in degrees.
3. Read the cut length and every mark, measured along the top edge from the ridge cut.
RAFTER LENGTH YOU CAN MARK
• Feet, inches and sixteenths (or eighths), or millimetres
• Ridge board, overhang on each side, gable or shed / lean-to roof
• Birdsmouth heel and seat, height above plate, plumb and seat cut angles
• Set the seat by the wall plate width or by the height above plate
• A drawing of the rafter laid flat, pinch-zoom, full screen
ROOF PITCH CONVERTER
• x/12, degrees, percent slope, or rise and run
• Rafter and hip length per foot of run, like the table on a framing square
RAFTER LAYOUT AND ROOF AREA
• Rafters per side at 12, 16, 19.2 or 24 inches on centre
• Roof area in square feet and roofing squares, sheathing sheets
SEE THE MATHS
Tap "Show how it's worked out" for every formula with your own numbers in it. Checks warn you when the seat bearing is short, the notch is deep or the pitch is low.
NO ADS, NO ACCOUNT, WORKS OFFLINE
The calculator is free and complete. Nothing is collected and nothing leaves your phone.
PRO, ONE-TIME PURCHASE
• Hip and valley rafters: length, plumb and side cuts, hip drop
• Every jack rafter at your spacing, with the common difference
• Cut list for the whole roof with the stock length to buy
• Saved jobs, PDF cut sheets that print sharp, and marks read aloud
The app gives geometry, not lumber sizes or spacing: check your span tables and local building code, and cut one rafter to test-fit before you cut the rest.
1. Type the span, outside of wall to outside of wall.
2. Type the pitch as x/12 or in degrees.
3. Read the cut length and every mark, measured along the top edge from the ridge cut.
RAFTER LENGTH YOU CAN MARK
• Feet, inches and sixteenths (or eighths), or millimetres
• Ridge board, overhang on each side, gable or shed / lean-to roof
• Birdsmouth heel and seat, height above plate, plumb and seat cut angles
• Set the seat by the wall plate width or by the height above plate
• A drawing of the rafter laid flat, pinch-zoom, full screen
ROOF PITCH CONVERTER
• x/12, degrees, percent slope, or rise and run
• Rafter and hip length per foot of run, like the table on a framing square
RAFTER LAYOUT AND ROOF AREA
• Rafters per side at 12, 16, 19.2 or 24 inches on centre
• Roof area in square feet and roofing squares, sheathing sheets
SEE THE MATHS
Tap "Show how it's worked out" for every formula with your own numbers in it. Checks warn you when the seat bearing is short, the notch is deep or the pitch is low.
NO ADS, NO ACCOUNT, WORKS OFFLINE
The calculator is free and complete. Nothing is collected and nothing leaves your phone.
PRO, ONE-TIME PURCHASE
• Hip and valley rafters: length, plumb and side cuts, hip drop
• Every jack rafter at your spacing, with the common difference
• Cut list for the whole roof with the stock length to buy
• Saved jobs, PDF cut sheets that print sharp, and marks read aloud
The app gives geometry, not lumber sizes or spacing: check your span tables and local building code, and cut one rafter to test-fit before you cut the rest.
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