0.00064516 is the conversion factor to convert square inches to square meters. However, it must be square inches. If you only have inches, then you will have to multiply by the second dimension to get square inches before converting to square meters.
To convert inches to meters, divide by 39.37 (since 1 inch = 0.0254 meters). For a 6.0 x 9.0 inch rectangle, the area is (6.0 \times 9.0 = 54.0 \text{ square inches}). Converting this to square meters gives you (54.0 \div 1550 = 0.0348 \text{ square meters}).
Square inches x 0.00064516 = square meters
140 square meters is equal to 215,278.21 square inches.
To convert inches to square meters, you need to first convert inches to meters by dividing by 39.37 (since 1 meter is approximately 39.37 inches), and then square the result since you are converting a linear measurement to an area measurement. The formula would be: (inches / 39.37)^2 = square meters.
There are 64,368 square inches in 438 square meters.
Square inches x 0.00694 = square feet
Square inches x 0.00694444 = square feet
1.2 square meters = 1,860 square inches.
Multiply square inches by 0.00064516 to get square meters.
Formula: square inches x 6.4516 = square centimeters
Divide by 144.