Google SketchUp is a free download and it will do the same thing. You just import the image into the program environment. Double click it into place and then select the tape measure looking tool icon. The only caveat is that you need to have a good idea of the size of some object in the image. Then you measure that object by clicking on the one side and dragging it to the other point whose dimension you know. Then you type in that dimension and hit 'enter.' A little window will pop up, asking if you want to resize the model. Hit yes or ok, and it automatically adjusts the image to the same scale as the measurements you input. Then you can use the tape measure tool to get any dimension of the objects in the picture. You can then draw a box around an object and it will give you the area of the box or circle or any other object shape you draw.
You can actually make modification plans on the image in 3 dimensions in full perspective and get measurements for your estimation of the whole project. So rather than spend $100 on that calculator, if you are a contractor, I recommend downloading Google SketchUp for free and using it. There is no limitation to its use except that for commercial usage, the Pro version is a lot better. That is $495.
There are two limitations to this operation: The objects in the image need to be normal to the camera angle-the camera needs to be perpendicular to the object so that the object's one side is the same width as the opposite side- If it projects into the background or the foreground, then there will be significant errors; the better the resolution of the camera the higher the precision of the measurements.
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Google SketchUp is a free download and it will do the same thing. You just import the image into the program environment. Double click it into place and then select the tape measure looking tool icon. The only caveat is that you need to have a good idea of the size of some object in the image. Then you measure that object by clicking on the one side and dragging it to the other point whose dimension you know. Then you type in that dimension and hit 'enter.' A little window will pop up, asking if you want to resize the model. Hit yes or ok, and it automatically adjusts the image to the same scale as the measurements you input. Then you can use the tape measure tool to get any dimension of the objects in the picture. You can then draw a box around an object and it will give you the area of the box or circle or any other object shape you draw.
You can actually make modification plans on the image in 3 dimensions in full perspective and get measurements for your estimation of the whole project. So rather than spend $100 on that calculator, if you are a contractor, I recommend downloading Google SketchUp for free and using it. There is no limitation to its use except that for commercial usage, the Pro version is a lot better. That is $495.
There are two limitations to this operation: The objects in the image need to be normal to the camera angle-the camera needs to be perpendicular to the object so that the object's one side is the same width as the opposite side- If it projects into the background or the foreground, then there will be significant errors; the better the resolution of the camera the higher the precision of the measurements.
This is a lot cheaper and does MUCH MORE!