Calculate the Studs Multiply the total wall length (in feet) by 0.75 (for 16-inch on-center stud spacing). Add three studs for each 90-degree corner. Add four studs for each 45-degree corner. Add two studs for each wall intersection (where another wall abuts the wall you are estimating). Click to see full answer. Regarding this, how do I calculate how much lumber I need?A single board foot is one square foot of wood that is one inch thick. You can measure board feet by multiplying length x width x thickness in inches, and then dividing by 144. If ordering a large amount by board feet, just multiply the total board feet needed by the price per board foot for the total cost.Also Know, how many studs do I need for a 12 foot wall? Your calculation is 192 divided by 16, which equals 12. Since there are 12 spaces in the wall, the number of vertical studs required is also 12. However, there must be one more added to the end for a total of 13 studs. Likewise, how do I estimate the cost of framing? The national average cost of framing a house is between $3,500 and $35,000, depending on the size. House framing costs are generally priced by square foot and your total price will depend on the house’s floor plan, site elevation, design of the home, and regional material and labor costs.How do you calculate square footage for lumber?Here’s how to calculate the cost of your order: The number of square feet of a piece of lumber is calculated by multiplying the length (in inches) by the width (in inches) and then dividing by 144. Example: Calculating the total cost of a piece of lumber 6″ wide by 46″ long at a price of $6.30 per square foot.