Koi Weight based on length
Length Weight
Inchs cm LF Grams Ounces Pounds

Weight? The weight of Koi can be approximated by using the formula Length3 / 1650. Of course each fish has a slightly different body shape and this should be considered in relation to the weight given by this formula.
The Feeding Calculator will help you estimate how much food your fish should be getting.
Use: Enter the length of the fish in inches or cm. For a normal Koi, the length would be from the mouth to the end of the tail. For a Long Fin Koi, use the length from the mouth to the start of the tail and be sure to check the LF box.
Notes:This calculator uses JavaScript
I'm confident this calculator is accurate, but things happen. Use it at your own risk,
 
Calculators Provided by Koi and Water Garden Society of Central New York