About this app

Fast+easy calculation of Food and Filter requirements for KOI, on and offline

Calculate the best indication possible to know:
-How much food your Koi need at each water temperature.
-How big your filter should be then
-How much food your filter can handle
-How much food your Koi need, plus how big your filter should be, using your own settings for body weight %.
-Simple table to keep track of your water treatments.

Calculations are instant,
Available OFFLINE after installation, so no WIFI or Internet connection necessary.
The calculator stores your entry's on your device so only enter up to 100 Koi for the calculations once. Adjust anything and the calculator instantly adjusts the results.

Inn- app adjustment for English, Dutch, French or German with the push of a button, and back if required.

Calculations in more detail:
1: How much food your Koi need at each water temperature.
Enter the water temperature (Celsius of Fahrenheit)
Enter how many Koi you have per length.
Result is instantly shown: Gram food you should totally feed your Koi per day, plus an advised number of feedings this amount should given in each day.
Calculation is based on average Koi body weights at each length.

2 How big your filter should be
Enter how much food you feed your Koi per day and select your biological filter material from a menu
Result is instantly shown: volume in Liter, or square meter filter material you need. (25% safety margin included in the calculation results)
Filtermaterial included: Lithaqua, Beads, Kaldness KNS, Kaldness K1/Bioflow, Red X matting, Matala grey, Matala green, Matala black, Matala blue, Japanese matting, Hunycomb blocks.

3 How much food your filter can handle
Select one or two filter materials in your biological filter and enter how much Liter or square meter you have.
The result is instantly shown and indicates with a 25% safety margin how much food your total biological filter can handle per day.

4 Total calculation
Enter the water temperature (Celsius of Fahrenheit)
Enter the total protein % of the food you feed.
Enter what % body weight you wish to use for the calculation for small, average or large Koi.
Enter how many Koi you have per length.
Result is instantly shown: Gram food you should totally feed your Koi per day, plus an advised number of feedings this amount should be given in each day.
Select your main biological filter material from a menu
Result is instantly shown: volume in Liter, or square meter filter material you need. (25% safety margin included in the calculation results)

We will regularly provide updates based on user experience to keep improving the app.
This app is made by an experienced Koi hobbyist, for own use and to help the Koi hobby worldwide to give a good indication of starting points for beginning hobbyists, and to help experienced hobbyists to have an easy total calculation tool at hand, everywhere, even offline. For use to explain how big of filters should be purchased and installed (behind decent coarse filtration), and even to discuss body weight % to use per Koi length.

The calculator is completely functional plus there will be extra functions available soon through in app purchases.

Please leave your comments and improvement ideas at:
info@koicalculator.com
or our Facebook page: Koi Calculator app

New features

Version 3 includes a table to easily keep track of water treatments. The use of all tables has been improved for most mobile devices and some minor bugs were fixed.
- can be used offline!
- simply fill out the table with the number of koi you have, how long they are and you get instant advice on how much food your koi need daily.

-Version 2 includes 27 different filter materials.