Construction estimates

I am planning to build a house of 900 sq feet at dha phase 8 karachi; with dimensions 31x29.

Our plan includes basement, ground and 1st floor.

I want estimates for grey structure as well as for the finishing.

I am confused if someone tells me an estimate of Rs.1550/sq ; how should i convert it into PKR. Like in my case i should multiply it by 900x3x1550 ? or just 1550 x 900 ?

Grey Structures Rs.1350/sq ft to Rs.1550/sq ft depends on design

and actual site conditions/soil test report.

Regards

DSA : You mean 1350x900x3 ? or just 1350x900