[czado]

I'd like to see IE dose recommendation which would include CSM+B as well as Chalated Iron for those who like to dose both dry in grams.

ppm Fe from grams CSM+B:
mg CSM+B * 0.0653mg Fe/mg CSM+B / (tank gallons * 3.785L/gal) = Fe ppm

ppm Fe from grams 10% chelated Fe:
mg chelated Fe * 0.1mg Fe/mg chelated Fe / (tank gallons * 3.785L/gal) = Fe ppm

Chuck Gadds C02 calculator, and any of his other ones

CO2 ppm from dKH and pH:
dKH * 3 * 10^(7 - pH) = CO2 ppm

For Chuck's other calcs you just need percentage of the compound for whatever you care about, then turn it into mg/L (ppm) in the tank. For example, for NO3 from KNO3.
(Atomic weights to 4 sig figs.)
K = 39.10
N = 14.01
O = 16.00
NO3 = 14.01 + 3*16.00 = 62.01
KNO3 = 39.10 + NO3 = 101.11
NO3/KNO3 = .6133 -> NO3 is 61.33% of KNO3

NO3 ppm from grams KNO3:
mg KNO3 * .6133mg NO3/mg KNO3 / (tank gal * 3.785L/gal) = NO3 ppm

Of course, for K from KNO3 it's much the same process. If NO3 is 61.33% of KNO3, K must be 38.67%.
K from KNO3:
mg KNO3 * .3867mg K/mg KNO3 / (tank gal * 3.785L/gal) = K ppm

endparenthesis,
I am listing unsimplified with units so it's easily adjustable. Variables are in italics, otherwise it's just there to correct units, 'case you want to rearrange the formulas for your purposes.

Somewhere along the line you'll need to decide if you want to calculate for grams dry dosing (easy as you can see) or solutions (little harder). All of this assumes 100% purity of compound of course. If one knew they had, say, 97% pure KNO3, they could just take that percentage of their final result.

You also have to decide if you're going to include teaspoon/tablespoon conversions for grams, at which point its best you get a scale and some samples, or just request some trials from members then include a disclaimer in the calc that its based on said measurements. A tsp of agricultural grade KNO3 will not have the same mass as Grant's Stump Remover (also KNO3) or reagent grade KNO3, for example. Like above this depends on how anal and percise you want to be.

In the end you may just want to study Steve Pituch's pages: chemical computations

As someone who's built some calcs for various hobbies, your users will depend on you for formulas and accuracy and you need to ask favors for good testing. Many who do these calcs by hand are developing their own calcs for their purposes or tied with other, older projects. Just the way it is.

Good luck with your project.