To see a video demonstration of the Area Calculator, click the "gear" icon in the top right corner of the calculator and select "Watch Demo".

Step 1: Import your image. Click the "gear" icon in the top right corner of the calculator. Select Import Image, then browse for the image on your computer. Once you have found it, click Upload.

Step 2: Use the line tool to draw a line of a known length. For example, if a side of your mosaic is 2", use the line tool to trace over the lenght of that side. Once you are done tracing, you will be prompted to enter the length and choose the units. After doing so, click the "Add to Canvas" button.

Step 3: Trace your image. Use the mouse cursor to trace around your image. Click the mouse to begin, them move to draw a line. Click again to change directions of the line. Eventually, you should meet up with your starting point and when you do click on the starting point, the area will be calculated.

Step 4: The calculation results will be shown at the bottom of the canvas. The first number is the perimeter of your tracing. The second is the area of your tracing.