MB HydroCalc

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26 reviews
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About this app

This calculator was designed to calculate how much nutrient-solution (fertilizer water) you will need to mix up to grow vegetables using MasterBlend's 4-18-38 tomato formula. This fertilizer can be used to grow vegetables with the "Kratky Method", using Dutch Buckets, or many other hydroponic methods.

To use the hydroponic fertilizer calculator you need to know either the dimensions of your container or the number of gallons it holds. We determine the correct amount of nutrients needed based on the total gallons amount.

Within the App, you can change from calculating Nutrients to calculating Water Volume by switching between the tabs at the top of the screen.

If you made a custom rectangular grow bed, you can input the inside dimensions into the Water Volume Calculator to find out how many gallons it holds. The number will carry over to the Fertilizer Calculator. Just remember that when using the Kratky Method, only 1/8-inch (or so) of your net pot should be underwater at the start of your grow.

If you already know how many gallons your containers hold, you can simply enter that number into the Water Volume field of the Fertilizer Calculator. The correct ingredient amounts will be calculated for you in Grams once you select either Lettuce or Tomatoes. It is important to weigh out the fertilizer using a scale so you don't over fertilize and kill your plants. Ideally, you would want the pH levels of your final solution to be around 6.4 - 6.7. You can research what your plants like best and check your solution using a pH meter.

While the calculator lists only a Tomato and Lettuce formula, the same two formulas have been successfully used with other vegetables as well. You can easily grow various types of peppers with the Tomatoes formula, and other leafy greens like kale work great with the lettuce formula.
Updated on
Jul 3, 2019

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26 reviews
Noel Arcilla
May 11, 2020
Great app specially for beginners in Hydroponics. I use it every time for my Kratky setup. The links to hydroponics videos is also a very good addition. Would be great if the fertilizer calculator has liters as well.
4 people found this review helpful
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A Google user
September 3, 2019
Awesome app!! Straight to the point! No headache n endless searching of calculation for amnt of ferts....but it will be EVEN BETTER if u added kg/grams as its used by other people in other parts ofcthe world!!
1 person found this review helpful
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Ricky B
May 26, 2020
I really like this AAP works great. But having a problem figuring out a round bucket, normally you would do height + Diameter and maybe a filled depth if needed. If I use your gallon calculation lets say length is 11 width is 11 depth is 10 I will get water volume is 5.2381 gallons not right. The correct way for a round bucket would be height 10 inch + diameter 11 inch would equal 4.11 U.S Gallons. Am I doing something wrong. But I do love this aap thank you for creating it.
3 people found this review helpful
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What's new

Updated to latest API