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- 1. FORMULA USED FOR ESTIMATING Earthworks Excavation (m3 ) = Height x Width x Length Actual Backfill (m3 ) = 1.25 x Theoretical Backfill Theoretical Backfill (m3 ) = VExcavation – VFooting – VGravel Bedding Slab / Soil Poisoning (m2 ) = Area of Building (Length x Width) Grading (m2 ) = Area of Column Footing (Length x Width) Concrete Works Volume of Footing (m3 ) = Length x Width x Thickness x 1.1 (Height) Volume of Column (m3 ) = Length x Width x Height x 1.05 Volume of Stairs (m3 ) = Length x Width x Height x 1.05 Volume of Slab (m3 ) = Length x Width x Thickness x 1.05 Volume of Beam (m3 ) = Base x Height x Length x 1.05 Number of Class “B” Cement Bags (Qty) = VConcrete x 7.5 bags/m3 Number of Sand (m3 ) = VConcrete x 0.5 m3 /m3 Number of Gravel (m3 ) = VConcrete x 1 m3 /m3
- 2. Formworks Perimeter for Column (m) = (2 x Length) + (2 x Width) Perimeter for Beam (m) = (2 x Base) + (2 x Height) Perimeter for Slab (m) = (2 x Length) + (2 x Width) Lateral Area for Column (m2 ) = Perimeter x Height Lateral Area for Beam (m2 ) = Perimeter x Span Lateral Area for Slab (m2 ) = Perimeter x Thickness Vertical Support for Column (Lumber Size: 2” x 3”) = Height x (7 Bd Ft/m) Horizontal Support for Column (Lumber Size: 2” x 2”) = Height x (21 Bd Ft/m) Diagonal/Brace Support for Column (Lumber Size: 2” x 2”) = Height x (11.7 Bd Ft/m) Vertical Support for Beam (Lumber Size: 2” x 3”) = Height x (6 Bd Ft/m) Horizontal Support for Beam (Lumber Size: 2” x 2”) = Height x (4.7 Bd Ft/m) Number of Board Feet / Vertical Support for Slab (Lumber Size: 2” x 3”) = Lateral Area x (9.1 Bd Ft/m2 ) Number of Plywood (Qty) = Lateral Area / (2.88 m3 / plywood) Number of Board Feet (Qty) = Number of Plywood x (22 board feet/plywood) Number of Form Oil (L) = Lateral Area / (25 m3 / L) Number of Nails (kg) = Lateral Area x (0.4 kg/m2 ) Tileworks Total Number of Tiles along its Length (Qty) = (Length – Wall Thickness)/0.6 Total Number of Tiles along its Width (Qty) = (Width – Wall Thickness)/0.6 Total Number of Tiles (Qty) = (Total Number of Tiles along its Length x Total Number of Tiles along its Width) – Number of Tiles occupied by stairs Area (m2 ) = Length x Width Number of Class “A” Cement Bags for Mortar Mix (Qty) = Area x (0.45 bags/m2 ) Number of Sand (m3 ) = Area x (0.025 m3 /m2 )
- 3. REINFORCE STEEL WORKS Total Length = Height - concrete cover (2xdiameter)+ main bar end hooks Total Length of all (m) = Total length x Quantity x No. of Main Bars No. of 6 m Steel bars = Total Length of all / Length of the steel bar x allowance for splicer Total Length Tie A B= Column Dimension -(2 x Concrete cover) x No. of sides + ( floor x 6 x diameter)/1000 Total No of Ties = Total Length / Length of Bar / diamter of ties No. of Lateral Ties In Columns = 2 + No of ties Total Length of Lateral Ties = Total Length of Ties x Quantity x No. of Lateral Ties in Columns Tie Wires (kg) = Quatity x (No of Ties + No of Main bars) x No of Later Ties in Columns x 0.4 /53 Total Length of Web Bars = Span x No. of Web Bars Total Length of Support = Span x top support + 0.25 + 0.25 + Span x Bot support + 0.25 Total Length of Midspan = Span / 2 x Midspan top support + span/2 x Midspan bottom support Gross Area = Length x Height x Quantity Net Area = Gross Area - Opening Vertical and Horizontal( pcs ) = Net Area x Bars in M per Sq.m / 6 Parallel Length and Width = W or L - 2(concrete cover)+ diameter Total Cut Bars = pcs x 2 x quantity Masonry Works Gross Area (m2 ) = Length x Height Net Area (m2 ) = Gross Area – Opening Number of CHB (Qty) = Net Area x (12.5 CHB/m2 )
- 4. Interior (CHB = 4” thick): Number of Class “A” Cement Bags for Mortar Fillers and Binders (Qty) = Number of CHB x (0.0411 bags/CHB) Number of Sand for Mortar Fillers and Binders (m3 ) = Net Area x (0.0022 m3 /m2 ) Number of Class “A” Cement Bags for Plaster (Qty) = Net Area x (0.0411 bags/m2 ) Number of Sand for Plaster (m3 ) = Net Area x (0.0022 m3 /m2 ) Exterior (CHB = 6” thick): Number of Class “A” Cement Bags for Mortar Fillers and Binders (Qty) = Number of CHB x (0.0982 bags/CHB) Number of Sand for Mortar Fillers and Binders (m3 ) = Net Area x (0.053 m3 /m2 ) Number of Class “A” Cement Bags for Plaster (Qty) = Net Area x (0.0982 bags/m2 ) Number of Sand for Plaster (m3 ) = Net Area x (0.01 m3 /m2 ) Number of Class “A” Cement Bags for Plaster in Beams and Columns (Qty) = Area x (0.082 bags/m3 ) Number of Sand for Plaster (m3 ) = Area x (0.009 m3 /m2 ) Painting Works Gross Area (m2 ) = Length x Height
- 5. Net Area (m2 ) = Gross Area – Opening Number of Boysen Epoxy Primer (L) = Net Area x (20 m2 /4L) Boysen Masonry Putty (L) = Net Area x (10m2 /4L) Boysen Permacoat Latex (2 coats) (L) = (Net Area x 2) x (25m2 /4L)