Transparent assumptions, editable rates.

The calculator does not decide whether a project is safe, code-compliant, profitable, or ready for a proposal. It organizes the math so a contractor can review the assumptions. Users should still verify measurements, labor laws, insurance costs, taxes, material specifications, customer requirements, and local conditions.

Default values are examples, not universal rates. A contractor working in a high-cost city, a union environment, an occupied facility, or a specialty coating niche should replace the defaults with known business costs. The goal is not to produce a magic price; the goal is to make the estimate easier to audit before it becomes a customer-facing number.

Assume 2,500 square feet of wall area, two coats, a production rate of 200 square feet per hour, and an average condition factor of 1.2. The adjusted man-hours are 2,500 x 2 / 200 x 1.2, or 30 labor hours. With a two-person crew, that is about 1.9 eight-hour crew days before schedule interruptions.

If the base wage is $30 per hour and labor burden is 35 percent, loaded labor cost is $40.50 per hour. Thirty hours at $40.50 equals $1,215 in loaded labor cost. If overhead is 15 percent, overhead adds about $182. The break-even labor cost becomes $1,397. At a 20 percent target margin, the selling price is $1,397 / 0.80, or about $1,746.

This example explains why the calculator separates wage, burden, overhead, and profit. A contractor who only multiplies 30 hours by a wage may send a price that covers payroll but does not recover business costs or profit.

The formulas above are the reference version. In practice, contractors walk through them in a fixed order, and skipping a step is the most common way a bid ends up wrong.

1. Measure the paintable area. Separate walls, ceilings, trim, doors, exterior siding, and detail work, because each task has a different production rate.
2. Apply the number of coats. Multiply paintable area by coats — 2,000 square feet of wall area at two coats is 4,000 square feet of paint application work.
3. Divide by production rate. At 200 square feet per hour, that 4,000 square feet of application work is about 20 man-hours before any preparation is added.
4. Add preparation and job conditions. Prep can change labor more than the paint itself — cleaning, sanding, patching, masking, moving furniture, high access, color changes, and cleanup all belong here, not folded invisibly into a lower production rate.
5. Use loaded labor cost, not base wage. Payroll taxes, workers' compensation, unemployment insurance, benefits, and paid time can make a $30 wage cost the business significantly more than $30 an hour.
6. Add overhead and profit last. Overhead covers business costs not tied to one can of paint or one hour on the wall; profit is what's left after project costs and overhead are both covered.

A quick check on the math: 30 man-hours at a $30 wage is $900 in base wages. With 35 percent labor burden, loaded labor cost is $1,215. Overhead and margin still need to be added on top of that before the number becomes a bid — see the worked example above for the complete build-up. Reviewed against the schedule, a two-person crew working 16 labor hours a day clears a 29-hour task in close to two working days, before setup, cleanup, material runs, or customer walkthroughs.