Shingles for a 2,400 sq ft roof

80 bundles of shingles

for 2,400 sq ft of roof (24 squares) with 10% waste, at 3 bundles per square.

Materials for a 2,400 sq ft roof

Squares24
Bundles, gable roof (10% waste)80
Bundles, hip roof or valleys (15% waste)83
Synthetic underlayment (1,000 sq ft rolls)3
#15 felt (400 sq ft rolls)6
Roofing nailsabout 61 lb

If 2,400 sq ft is the footprint, not the roof

Measured flat from above, a footprint of 2,400 sq ft makes a bigger roof once you account for the slope:

PitchRoof areaSquaresBundles
4/122,530 sq ft25.384
6/122,683 sq ft26.889
8/122,884 sq ft28.896
10/123,124 sq ft31.2104
12/123,394 sq ft33.9113

Start from your house footprint instead

Shingles needed

80 bundles

2,400 sq ft of roof (24 squares) at 6/12, plus 10% waste.

Roof area2,400 sq ft
Squares24 (order 26.4)
Bundles (3 per square)80 (about $3,200)
Synthetic underlayment3 rolls of 1,000 sq ft
#15 felt7 rolls of 400 sq ft
Roofing nailsabout 61 lb

Other roof sizes

Questions

How many bundles of shingles for a 2,400 sq ft roof?
80 bundles: 24 squares plus 10% waste, at 3 bundles per square. Allow 83 for a hip roof or one with valleys.
How many squares is a 2,400 sq ft roof?
24 squares (a square is 100 sq ft of roof).
How much does it cost to shingle a 2,400 sq ft roof?
Shingles alone run about $3,200 at $40 a bundle. A full asphalt shingle replacement typically costs $4 to $8 per sq ft installed: $9,600 to $19,200.
My house is 2,400 sq ft. How big is the roof?
Bigger than the house. For a one-story 2,400 sq ft house with a 6/12 roof and 1 ft overhangs, the roof is roughly 3,010 sq ft. Two-story homes have about half the roof area for the same floor space.

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