If checking that the calculator matches your cameras Div8 dimensions, the specifications for megapixels and aspect ratio are rounded nominal numerals which will be close, but might not compute the exact precise image size in pixels (due to rounding - camera specifications are rounded values.) If not exact, the best try the significant digits is to first enter the second option of actual sensor dimensions in pixels instead of Megapixels to compute the actual precise megapixels and aspect ratio values for your camera. It will show at least four significant digits, if applicable (fractional trailing zeros are not shown or needed). The calculator is written for megapixels (first option), but to aid seeing at least four accurate significant digits, the Image Size option was added to determine actual precise values of megapixels and aspect ratio for your camera. So the computed pixel dimensions could be just a few pixels off, but a few tenths of a percent will certainly be close enough for practical purposes. To recompute those four exact digits of pixel dimensions likely requires Megapixels and Aspect Ratio to also be four significant digits because in math, the final answer can only contain as many accurate significant digits as the least precise value computing it. Whereas megapixels and aspect ratio are rounded specifications, only two or sometimes maybe three significant digits (not totally precise). Pixel dimensions are exactly known and are typically 4 significant digits. It computes actual megapixels and Aspect Ratio with greater precision.
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