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As a rule of thumb (HVAC Equations Data and Rules of Thumb2nd Ed)
you have to get the area by ft then divide it on the following
offices, commercial: sq. ft / ton
Banks court houses: sq. ft / ton
police station post office : sq. ft / ton
Restaurant: sq. ft / ton
Kitchen: sq. ft / ton
Hospitals: sq. ft / ton
Residential: sq. ft / ton
Apartment: sq. ft / ton
School: sq. ft / ton
library & museum: sq. ft / ton
malls: sq. ft / ton
sometime some thumb rule can b apply for example
150 - 170m2/ton for office and normal working area
100 - 120m2/Ton for public gathering area\\ food court
80 - 100m2 /Ton for mosque theater auditorium etc
but still depends on many factors
Multiply the area by the thickness to get the volume, then by the BRD to get the mass.