It depends on the texture of the surface (including its preparation), its porosity. It also depends on the coverage of the paint and how many coats you want/need. Look at the coverage information on the paint container.
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(6-ft x 172-ft) / (200 square feet per gallon) = 5.16 gallons
He covered 115 square feet per gallon. - Way below the average, which is about 280 sf per gallon.
You must have your figures wrong. - 4 litres of paint will not even come close to covering 100 metres square! !
2.81 gallons for every 1/100 of an inch thick. Most paints are applied at 4 mils wet, so they usually cover about 400 square foot per gallon. So you'd need about a gallon and a quart to cover 450 square feet.
well being a two story home not knowing exact size i would tell you bout 20-25 gallons without ceilings go to affordablepainters.biz to get a quote Figure basically 300 Sq Ft per gallon. This will change depending on how porous the siding is and how many coats you are applying. Paint companies recommend two coats for a first rate job. You may be over or under depending but this is a good rule of thumb. Same for the trim.