Example :

20mm thick external plaster

Considering 100sqm area.

Proportion for mix C:M = 1:4.

Summation of proportion =  5.        

Quantity of one cement bag = 0.035cum.

Quantity of wet mortar = 0.02 x 100 = 2cum.

Adding 20% wastage = 2 +( 2 x 0.2 ) = 2.4cum.

Volume of dry mix = 2.4 + (2.4 x 1/3) = 3.2cum.

Volume of cement = (dry volume / 5) x 1
                              = (3.2 /5) x 1
                              = 0.64cum
                              = 0.64 / 0.035
                              = 18.3 bags
                              = 19 bags

Volume of sand = (dry mix / 5) x 4
                          = (3.2 /5) x 4
                          = 2.56cum.






PARTICULAR
QUANTITY
RATE(RS)
AMOUNT(RS)
Materials
Sand
2.56cum
1300
3328
Cement
19bags
250
4750
Scaffolding
L.S.
550
550
Labors
Mason
 8nos
200
1600
Helper
12nos
90
1080
Total
11708.5




Tools & Plants
1%
0f total
   117.08


Total
11825.60
 Water charges
2%
Of total
 236.512


Total
12062.112
 Supervisor, Overhead & Profit
25%
Of the total
3015.53


Grand Total
15077.64


RATE FOR 100m² = 15077.64Rs.
RATE FOR 1m²     =150.77Rs.