Roof Calculator
By using the table below together with the scale as indicated on your drawings, you are able to convert plan lengths to slope lengths.
Example
My roof plan drawing indicated a scale of 1:50 and a pitch of 35°
a) Scaling from the ridge to the gutter line at 1:50 indicated a
measurement of 3650 mm.
b) Multiply 3650 by the 35° calculation below (1.221) gives a
slop length of 4456 mm.
Multipliers to covert plan lengths to slope lengths
|
Slope |
Multiplier |
|
15° |
1.035 |
|
20° |
1.064 |
|
25° |
1.103 |
|
30° |
1.155 |
|
35° |
1.221 |
|
40° |
1.305 |
|
45° |
1.414 |
|
50° |
1.556 |
|
55° |
1.743 |
|
60° |
2.000 |
|
65° |
2.366 |
Did You Know
Did you know - there are 1016 kg per ton ?
Did you know - there are 0.6 m3 per ton ?
Did you know - there are 1693 kg per m3 ?
Did you know - there are 2400 kg per m3 of concrete ?
Did you know - there are 20 no wheel barrow loads per m3 ?
Did you know - there are 40 no 25 kg bags of cement / plaster per ton ?
Did you know - 1no 25 kg bag of plaster finish will cover 10.5 m2 ?
Did you know - there are 60 no 65mm x 215mm bricks per m2 ?
Did you know - there are 10 no standard 215mm x 440mm blocks per m2 ?
Did you know - there are 60 no 267mm x 168mm plain tiles at 100mm gauge per m2 ?
Did you know - there are 10 lm of battens required per m2 for the above plain tiles ?
Did you know - there are 10 no 420mm x 330mm modern tiles at 75mm headlap per m2 ?
Did you know - there are 3 lm of battens required per m2 for the above modern tiles ?
Did you know - 1 m3 of water weighs 1 ton ?
All weights & measurements shown are for guide only