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Converting Fertilizer NPK ratings to PPM
and Teaspoons per Gallon
Return Back To OnlinePot's Grow Guides
Main Grow Page#1
Or Main Grow
Page#2
One can estimate the parts per million in solution (ppm) produced by a
quantity of fertilizer in a gallon of water, based on the fertilizer's
N-P-K rating.
For each number in the rating apply the following formula:
> one teaspoon (5ml) of a given fertilizer in a gallon of water
(10xN)÷ 0.768 = ppm
> one tablespoon (15ml) of fertilizer in a gallon of water:
(10xN)÷ 0.256 = ppm
Example: Peter's Professional All-Purpose Fertilizer with N-P-K
rating of 20-20-20.
(10x20)÷.768=260.4 ppm
Therefore, one teaspoon (5ml) of Peter's Professional All-Purpose
20-20-20 in one gallon of water will produce a solution that contains
approximately 260.4 ppm of Nitrogen, 260.4 ppm of P (P2O5), and 260.4
ppm of K (K2O) for a TOTAL ppm of approximately 781.3 .
Explanation
It's important to understand that with the term "parts per
million," we are expressing a measurement in terms of a RATIO,
which, like miles per hour or pounds per square inch, is a relation in
degree or number between two separate measurements. "Parts per
million" is a common way of expressing the measurement of the
dilution of something in solution, which for our purposes here, is the
dilution of fertilizer components in water. It just so happens that
fertilizer N-P-K ratings are also ratios, as is the measurement of
teaspoons per gallon.
Parts per million is most often alternately expressed as milligrams per
liter because it's so easy to convert due to the efficiency of the
metric system: 1000 milligrams = 1 gram and 1000 grams of water = 1
liter; 1 thousand x 1 thousand = 1 million; voilá- parts per million.
Fortunately, the "parts" in "parts per million" are
generic. It can be parts of a teaspoon just as easily as it can be parts
of a gram. N-P-K ratios are also generic expressions of percentage, or
parts per hundred. Unfortunately, 1 gallon does not equal 1 thousand
teaspoons; it takes 768 teaspoons (or 256 tablespoons) to equal one
gallon. But by knowing this, one ratio can be converted into the terms
of another ratio, which is what the formulas above do.
Remember,
Before relying on these formulas to fertilize your grow, you should be
absolutely aware that N-P-K ratings don't necessarily precisely describe
the amount of each nutrient in the fertilizer, but instead describe the
minimum amount of nutrient to be found, as explained in Mr.Ito's
excellent FAQ on the subject.
The only way to know for certain the ppm of your fert mix solution is to
measure it's EC, with an electronic TDS meter as you mix it. If this
isn't possible, at the very least try to use only high-quality
fertilizer brands with reputations for their accuracy and consistency of
their analyses and products.
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