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Many poetic things could be said about salt, like Mr. Gandhi's walk, or the bitter rivals in Japan who gifted salt when one was in need, because who can live without salt? This page, however, is more prosaic than that.
You may want a utility that given a list of weights (presumably of cabbage) will return the amount of salt to use (2% by default) possibly removing some value (the weight of the container) from each given value, and checked that you haven't made any errors in the adhoc code you were writing on the command line to do this prior.
$ mathu kraut -p 1 -t 10 60 60
100.0
You probably do not want 100% salt; the above is just to confirm that the -t tare value of 10 is being subtracted from each weigh (60) prior to summing things up. 0.02 would be a more typical value for a kraut salt percent, by weight of cabbage, or maybe a higher value for a summertime ferment if you haven't got cooling.
https://thrig.me/src/scripts.git
Amounts of salt in various foodstuffs found in the kitchen. And some math so I do not need to work it out from scratch, again.
amount salt
1/4t 1.4g 550mg sea salt
1T 18g 820mg white miso
1T 15g 1000mg soy sauce
1T 15g 1160mg dark soy sauce
1T 14g 90mg salted sweet cream butter
How much to substitute depends on how strongly flavored the replacement salt is, and how that flavor mixes with the dish in question. It may be necessary to only substitute, say, half of the sea salt with some other salt product, or for more complexity replace the sea salt with both soy sauce and miso in appropriate amounts.
The conversion is a ratio, n is to m as p is to q. To replace 1/2t (1100g) of sea salt in "almond sugar bread" with white miso one would want to know how much 1100mg of salt is in white misos, which isn't a real unit but is less bland than grams.
n/m = p/q
18/820 = x/1100
1100*18/820 = x
or
SBCL> (/ (* 1100 18) 820)
990/41
SBCL> (format nil "~,1f" (/ (* 1100 18) 820))
"24.1"
So that's 24.1g of white miso to replace the sea salt. This does not appear to be wrong; 24 is a bit larger than 18 as 1100 is a bit larger than 820. I'm terrible at math and usually remain suspicious that I've made some error. And adding too much salt could be a disaster.
Someone had complained that miso was "too salty" for them, but did not complain when I replaced the sea salt with miso without telling them. The miso gave the sugar bread a nice bit of complexity. But it was still sugar bread with too much sugar.