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Measure Roof Pitch and Angle with 2 Levels or Lay Phone Directly on Slope to Measure and Speak Angle
Hold spirit levels plumb and level.
Measure and mark length on horizontal level to vertical level. Then mark height on vertical level to roof surface, remove levels and measure marked height.
Enter ↔ Length and ↕ Height measurements and hit Calculate to find roof pitch and angle. Drag the slider to animate, or with phone or tablet, measure directly from roof surface.
Measure and mark length on horizontal level to vertical level. Then mark height on vertical level to roof surface, remove levels and measure marked height.
Enter ↔ Length and ↕ Height measurements and hit Calculate to find roof pitch and angle. Drag the slider to animate, or with phone or tablet, measure directly from roof surface.
← Length →
Height ↕
Pitch / Angle
Pitch and Angle are two related concepts in geometry and physics.
Pitch is the measure of how steep or flat a surface is, such as a roof or a ramp. Angle is the measure of how much a line or a plane is rotated from a reference direction, such as the horizontal or the vertical.
One way to compare pitch and angle is to use the ratio of rise to run, which is the vertical distance divided by the horizontal distance of a slope. For example, a roof that rises 4 units for every 12 units of horizontal length has a pitch of 4 in 12, or 4:12. The angle of this roof is the angle between the roof and the horizontal plane. In this case, the angle is about 18.43°.
Another way to compare pitch and angle is to use the percentage of Grade, which is the rise divided by the level horizontal length of a slope.
For example, a ramp that rises 3 units for every 5 units of level horizontal length has a grade of 60%.
3 / 5 = 0.6, then multiply by 100 = 60%.
The angle of this ramp is the angle between the ramp and the horizontal plane. In this case, the angle is about 36.87 degrees. Grade percentage can also be calculated by: tan(angle) x 100.
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Adjust scale of diagrams to measure 100% scale on screen with a ruler.
If you need to take full scale measurements directly from your monitor, adjust the size of the diagrams on screen to match a ruler. Does not affect printed sizes. Use keyboard Cursor Keys to fine tune as you adjust scale.
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