Measure the length of the driveway with a tape measure and note the measurement on a note pad with a pencil.
Measure the width of the driveway with the tape measure. Note the measurement on the note pad.
Measure offsets such as circles and triangular-shaped areas. Note the circumference of circles and base and height of triangular-shaped areas.
Calculate the measurements. Multiply the length of the driveway by the width for the overall square footage.
Calculate the area of a triangle by using the formula 0.5(base X height). Multiply the base measurement of the triangle by the triangle height measurement for a total. Multiply the total by 0.5 or 1/2.
Use the formula pi(radius x radius) for a circular area. Multiply the radius (1/2 of the circumference) by itself and note the total. Multiply the total by pi or 3.1416 to determine the circular area.
Add all of the square foot area totals together for a grand total. Divide the grand total by 9 (1 square yard = 9 square feet) to determine the square yardage of the driveway.