80 for the roof and enough more for the starter row and the cap. There is no way to figure the extras without knowing the width of the roof or how much of it is bottom edge and peak.
13 @ 6" lay and 100 square feet per 3 bundles
43560 sqfeet are in a acre
5.85 squares + 15% waste = ~6.75 squares of material needed 1/3 square per bundle of shingles 20 - 21 bundles of shingles (buy 21 and return the extra if necessary - it's i'mportant to have shingles from the same pallet/factory for matching purposes.
3.3sq.feet
3
27.7778 square yards.
1000 sq feet
You need to know the other measurement.
470 sq. yards = 4230 sq. feet
Sq feet is an area measurement. Meter is a lineal measurement - there is no correlation.
1250 square feet is equivalent to 116.1288 square meters.
Linear measure and square measure cannot be converted