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      Use Cases for Custom Formulas

      At Togal, you can create custom mathematical calculations for your quantity output within each classification, and use it to achieve different goals. Refer to this page for a tutorial on creating custom formulas. 

      The following are examples demonstrating how custom formulas can be applied to various quantity takeoff purposes.

      Vapor Barrier Calculation

      Vapor barrier is typically priced per 100 SF (SQ). After obtaining the total gross floor area from an area classification, you can use the Custom Formula to divide the area in SF by 100, to directly get the actual quantity for Vapor barrier in SQ. 

      Reinforcement Calculation

      Reinforcement is typically priced by weight in tons. The estimation process involves 4 steps:

      1. Determine the total linear footage (LF) of the reinforcement;
      2. Check the Rebar Weight Factor Conversion Table** and get the Weight per Unit Length factor (in lb/ft) for the specific rebar size;

        **Rebar Weight Factor Conversion Table

      3. Calculate total rebar weight in pounds (lb) by multiplying the results from Step 1 and Step 2;
      4. Convert the result from Step 3 from pounds to ton (1 ton = 2,000 lb).

      Rebar Calculation Example

      cross section view of the column The left image shows a cross section view of a 12” x 8” column. The total height of the column is 10ft, with 4 #5 longitudinal reinforcement and #5 @8" transverse reinforcement. Determine the reinforcement quantities needed for the column.

       

      Step 1: Determine the total LF of the reinforcement

        • Longitudinal Reinforcement

      Length of each long bar = 10'

      Total length of long bar (lf) = 10' x 4 bars = 40' 

        • Transverse Reinforcement

      Length of each tie = (12" + 8") x 2 / (12" / 1') = 3.33'

      Number of ties = ⌈Height of Column / Tie Spacing⌉ + 1 

             = ⌈10' / (8" / (12" / 1'))⌉+ 1

             = 16

      Total length of ties (lf) = 3.33' x 16 ties = 53.28'

      Step 2: Check the conversion table to get the Weight per Unit Length factor (in lb/ft)

        • For #5 bars, the weight factor is 1.043 lb/ft.

      Step 3: Calculate total rebar weight (in lb) 

      • Longitudinal Rebar Weight (lb) = 40' x 1.043 lb/ft = 41.72 lb
      • Transverse Rebar Weight (lb) = 53.28' x 1.043 lb/ft  = 55.57 lb
      Step 4: Calculate total rebar weight (in ton) 
        • Longitudinal Rebar Weight (ton) = 41.72 lb / 2000 lb/ton = 0.02 ton
        • Transverse Rebar Weight (ton) = 55.57 lb / 2000 lb/ton = 0.03 ton

       

      Following these calculation steps, the custom formula can directly take the numerical values from the classification and calculate the rebar weight.