You'd have to weigh them or count the slices in a pound and use 1/4 of them.
How many slices of bacon equals 1/4 lb?
Regular-sliced bacon is .062 inches thick (1/16 inch)
with 16 - 20 slices per pound
Thin-sliced bacon is .031 inches thick (1/32 inch) with
28 - 32 slices per pound
Thick-sliced bacon is .111 inches thick (1/8 inch) with
10 - 14 slices per pound
https://www.porkretail.org/filelibrary/Retail/BaconTrends.pdf