Converting package label to PPM

I forgot the math to convert what's on the package label to ppm. I want to be able to figure out per gram the ppm of what's inside any given powder nutrient mix.

In advance I appreciate anyone who takes the time to write it out and show the math.

Amazon is running behind so I have to make a stuff I don't use any more concoction for a few days.

ProPheT 216 said:

I forgot the math to convert what's on the package label to ppm. I want to be able to figure out per gram the ppm of what's inside any given powder nutrient mix.

In advance I appreciate anyone who takes the time to write it out and show the math.

Amazon is running behind so I have to make a stuff I don't use any more concoction for a few days.

Click to expand...

PPM is mg/liter, so:

PPM = Grams/Gal * 264.2 x percentage listed (1000mg/3.785 liters = 264.2)

It gets a little trickier for P and K because the label (in the US at least) lists the oxide, not the elements.

E.g. a 10-10-10 label is actually 10-4.3-8.3 of Nitrogen, Phosphorous, and Potassium

* P is 43.6% of P2O5, K is 83% of K2O

You can do the same for liquids provided you know the specific gravity, usually on the bottle, or simply divide weight by volume.