Roofing Calculator

This counts the whole roofing load rather than the roof area alone. Give a building and its pitch for a plain gable, or a footprint with the eave, rake, ridge, hip and valley lengths you measured, and it returns squares, shingle bundles at three to the square, underlayment rolls, ice and water shield, starter strip, hip and ridge cap, drip edge pieces, valley metal and the nail count by weight. Every coverage figure it counts against is printed, and most of them are yours to change. Flashing, ridge vent, decking repair and prices are not in it.

Calculator Type
Measurements In
Building, footprint and edge lengths in feet or metres; overhang in inches or millimetres; bundle coverage in linear feet or linear metres. Squares, bundles, rolls and 10 ft sticks are products rather than units and keep their own sizes, with the metric equivalent printed beside them.

For a simple two-plane gable. The eave, rake and ridge lengths are worked out from the building and the pitch, then everything is counted off them.

Rise over a run of 12, which is a ratio: 6 in 12 is the same roof as 150 mm in 300. The slope factor beside each choice is what a footprint is multiplied by.
Added on every side. Blank takes 12 in. Enter 0 to work from the walls alone.
Ten on a simple gable, fifteen or more on a roof with hips, valleys and dormers.
Roll sizes as sold in North America. The result row prints each one in square metres as well, so the coverage can be checked against a roll on a metric shelf.
Zero where the code does not call for it. One 36 in course is the usual requirement in a cold climate.
Printed on the wrapper. Linear feet, or linear metres in metric; blank takes 100 ft, or 30 m in metric. Around 100 ft is common and some products give 120.
Also on the wrapper. Linear feet, or linear metres in metric; blank takes 25 ft, or 7.5 m in metric. Laminated cap runs about 20 to 25 ft a bundle.
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Measurements In
Building, footprint and edge lengths in feet or metres; overhang in inches or millimetres; bundle coverage in linear feet or linear metres. Squares, bundles, rolls and 10 ft sticks are products rather than units and keep their own sizes, with the metric equivalent printed beside them.

For a hip, a cross gable or anything cut up. Give the sloped area or a footprint with its pitch, then the edge lengths you measured.

The area the roof covers seen from above. Square feet, or square metres in metric. The pitch below turns it into sloped area.
Rise over a run of 12, which is a ratio: 6 in 12 is the same roof as 150 mm in 300. The slope factor beside each choice is what a footprint is multiplied by.
Ten on a simple gable, fifteen or more on a roof with hips, valleys and dormers.
Every gutter line added together. Linear feet, or linear metres in metric.
Sloping gable edges. A pure hip roof has none. Linear feet, or linear metres in metric.
Linear feet, or linear metres in metric.
Measured along the slope, not on the plan. Linear feet, or linear metres in metric.
Linear feet, or linear metres in metric.
Roll sizes as sold in North America. The result row prints each one in square metres as well, so the coverage can be checked against a roll on a metric shelf.
Zero where the code does not call for it. One 36 in course is the usual requirement in a cold climate.
Printed on the wrapper. Linear feet, or linear metres in metric; blank takes 100 ft, or 30 m in metric. Around 100 ft is common and some products give 120.
Also on the wrapper. Linear feet, or linear metres in metric; blank takes 25 ft, or 7.5 m in metric. Laminated cap runs about 20 to 25 ft a bundle.
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