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@Khornight2
The most effective way is to weigh yourself on dry land and then do it again in a pool, the difference will give you the numbers needed to work it out.
The way most people do it is to get a device that sends an electric signal through the body and measure the resistance. This works if the impulse travels through the whole body, but mostly they only really work in a limb (they are built into scales which will measure legs and those machines in gyms you put your finger into measure arms).
As a cyclist be wary of the scales that do it as they are really only measuring the fat in your legs, which in most cyclists is a lot less than elsewhere.
Obviously like most body measurements numbers work best when compared to your previous numbers rather than some arbitrary ideal.