How much product will I need for my project?

STANDARD

A 3 lb bag of dry PTP covers 14 x 14 inches x 1/4 inch thick 
A 40 lb bag of dry PTP covers 9 square ft x 1/2 inch thick (1 square yard)

METRIC
A 1.3 kg bag of dry PTP covers 36 x 36 cm x 6 mm thick 
A 20 kg bag of dry PTP covers 110cm x 110 cm x 1 cm thick (approx 1 sq meter)
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For those who wish to calculate their own:
1lb of dry PTP covers : 1 sq foot x 1/8 inch thick
                                          8 x 8 inches x 1/4 inch thick
                                          6 x 6 inches x 3/8 inch thick
1 kg of dry PTP covers : 45 cm x 45 cm x 3 mm thick
                                            32 cm x 32 cm x 6 mm thick
                                            25 cm x 25 cm x 10 mm thick 
These pictures will be useful:

Statue NOT made of Pal Tiya Premium