You cannot calculate it, since it depends on some varying factors like the image content and some other JPEG parameters like optimization or progressive.
You can use a program, e.g. AZImage - see links -, that allows you to fine set the compression parameters to get an idea about the resulting size.
compression ratio=uncompressed image size/compressed size
compression ratio = compressed size / uncompressed size the ratio should be between 1 and 0 (multiply with 100 to get the ratio in percent) a ratio greater than 1 means, the compressed size is actually greater than the uncompressed size a ratio just below 1 means bad compression the lower the ratio, the better the compression
Compression ratio in engineering can be calculated by dividing the total volume of a system before compression by the total volume after compression. In computing, file compression ratios are calculated by comparing the original file size to the compressed file size.
The lowest compression ratio of a compression-ignition engine that allows a specific fuel to be ignited by compression ignition.
23:1 compression ratio
Compression ratio simply means the difference in size of the original vs compressed unit. Compression ratio is a commonly used term for internal combustion engine piston/cylinder compression and file compression. Ratios differ depending on the type of engine or the type of file being compressed. In file compression, 7zip has the highest compression ratio.
The compression ratio for NASCAR engines is limited to 12.0:1.
The compression ratio for the 1995 Mustang is: 9.0:1
8.4:1 is the compression ratio for 04-07 STi's.
The compression ratio is simply the ratio of the absolute stage discharge pressure to the absolute stage suction pressure.
"600 psi" is not a compression ratio; it's a pressure. For a RATIO, you need to compare TWO different numbers.