Page 22 of the Everyday Calculators archive. Use the first page for the full category guide and topic map.
Add wall areas in square feet and divide by the coverage of the chosen sheet size. A 4×8 sheet covers 32 square feet before waste; round up and add a practical allowance for cuts.
Calculate the tiled area, multiply by 1.10 for a 10% waste allowance and divide by the coverage per box or tile. Round up to whole packages and use a larger allowance for diagonal or complex layouts.
For a simple full-time estimate, hourly rate × hours per week × weeks per year. At 40 hours for 52 weeks, multiply the hourly rate by 2,080. Actual annual pay changes with unpaid time off, overtime and variable hours.
Use home size only as a starting point, then adjust for books, kitchenware, closets, garage storage and how long you have lived there. Inventory is more accurate than bedroom count alone.
Volume = length × width × thickness, using the same units. Convert to cubic feet, then divide by the concrete bag’s stated yield and round up to a whole bag.
Cubic yards = square feet × depth in feet ÷ 27. For a 3-inch layer, use 0.25 feet as the depth. Round up for settling and uneven beds.
Calculate wall area from room perimeter × wall height, subtract large openings if desired, multiply by the number of coats and divide by the paint label’s square-foot coverage per gallon.
For a rectangle, square feet = length in feet × width in feet. Split irregular rooms into rectangles, calculate each area and add them together.