A gallon of paint will cover about 300 square feetof wall area. So it will depend on the surface you are painting but in general square 5 gallons will cover approximately 1500square feet. Some manufacturers stretch ... If you can't decide between 4 or 5 gallons, go with 5 and buy it in a 5-gallon container. It should actually be cheaper than three 1-gallon cans, and you're guaranteed the colors will be the same.
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If your drum is a 55 gallon drum and your paint can cover 400 square feet per gallon then you may cover (one coat only) a square almost 150 by 150 feet.
About 1/80 of a litre - barely a touch out of the can.
Single coat ,100sqft Double coat 50sqft
10 meters
Depends on the quality of the paint. To estimate the cost per square foot, divide the cost of the paint by 350, for square meters, divide the cost by 32.5 and that should give you a pretty good idea of what it will cost for one coat of paint.