Easy no frills free feed calculator

  • Thread starter bigbagofbuds
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bigbagofbuds

bigbagofbuds

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I made a little feed calculator because I was having constant issues when I started using liquid fertilizers only (I was coming from using dry ammendments).

This calculator is fairly simple, it will tell you the expected PPM based on the fertilizers you use and the rate you use them. Its definitely not perfect but I think it works well enough that I am happy to give others access so they can make a copy for their own use.

To use it all you have to do is enter the NPK and mirconutrient percentages for your fertilizer on the "Inputs" sheet. One thing to note is it will auto calculate the elemental potassium and phosphorus percentage based on the values you enter in the P2O5 and K2O rows.

Step 2 is to go back to the "Feed Calculator" sheet and under column D where it says ingredient you enter the name that you enter for your fertilizer and the rate that you are using it.

Its currently configured for my custom MediOne blend so you can see a sample. After using this calculator I found out I was short on calcium and magnesium and I am very close to iron toxicity, ironically a lot of calmag products also include iron.

Note its currently in metric units only however I plan to change that in the future.

 
bigbagofbuds

bigbagofbuds

105
43
Here is a quick example of the problem this calculator solved for me. After doing this work the plants I am growing using this nutrient line up are looking significantly better.

I am using Green Planets Medi One nutrient line up, it calls for the following schedule for late veg
2ml per L Medi One
2ml per L Ocean Magic
2ml per L rezin

I was constantly fighting deficiencies but given that I have experience over fertilizing I was trying not to do so by blindly increasing the feeds.
I input the fertilizers into my calculator and this is what I found.
1634243499877


This is the bloom feed as they recommend

1634243637009


This is my adjusted feed after using the calculator (decimals are because I use a teaspoon measure in gallon jugs)
1634243820854
 
bigbagofbuds

bigbagofbuds

105
43
Ive updated the calculator to be easier to use. You can now enter your total water volume, then enter the amount of each fertilizer you add in total. This is much closer to how the fertilizer will be mixed in practice so its easier to understand.

 
freezeland2

freezeland2

1,080
163
Why wouldn’t you just use the product dosing chart you can download from the medi one website?
 
bigbagofbuds

bigbagofbuds

105
43
Why wouldn’t you just use the product dosing chart you can download from the medi one website?
I was constantly having a calcium deficiency pop up in late veg/early flower with their charts.

If you see my earlier post there is a screenshot showing that my base water doesnt have enough calcium to work with MediOne's feed charts.

Since Ive started adding CalMag and now Ive moved onto just calcium nitrate, I havent had any issues and the plants are happier with no spotting on the leaves.
 

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