https://www.meadmaderight.com/tosna-calculator

#+NAME: input-data
| starting gravity        | 1.100 |         |
| batch size              |     5 | gallons |
| sg from nonfermentables | 1.000 |         |
| yeast nutrient req      |   0.9 |         |

#+begin_src C :exports results :includes (list "<stdio.h>" "<stdlib.h>") :var tab=input-data
char *err_ptr;
double yeastRequirement = strtod(tab[3][1], &err_ptr); //a.k.a., M
if (*err_ptr != '\0')
    puts("`tab[3][1]' is not a full number!");
double sg = strtod(tab[0][1], &err_ptr); //a.k.a., H
if (*err_ptr != '\0')
    puts("`tab[0][1]' is not a full number!");
double sugarBreak = (sg - 1.0) / 3.0 + 1.0;
double batchSize = strtod(tab[1][1], &err_ptr); //a.k.a., B
if (*err_ptr != '\0')
    puts("`tab[1][1]' is not a full number!");
double brix = ((182.4601 * sg - 775.6821) * sg + 1262.7794) * sg - 669.5622; //a.k.a., R18
double digestionRequirement = brix * 10.0 * yeastRequirement / 50 * batchSize;
double L = strtod(tab[2][1], &err_ptr);
if (*err_ptr != '\0')
    puts("`tab[1][2]' is not a full number!");
double fruitGrav = (100.0 / (sg * 1000 - 1000)) * ( L * 1000 - 1000); //a.k.a., R19

//printf("brix\t%lf\n", brix);
//printf("digestionRequirement\t%lf\n", digestionRequirement);
//printf("fruitGrav\t%lf\n", fruitGrav);

double totalRequirement=digestionRequirement;
if(fruitGrav > 0)
  totalRequirement -= (fruitGrav / 100.0) * digestionRequirement;

printf("total nutrient requirement\t%lf\n", totalRequirement);
printf("each nutrient addition\t%lf\n", totalRequirement/4.0);
printf("1/3 sugar break\t%lf\n", sugarBreak);
#+end_src

#+RESULTS:
| total nutrient requirement | 21.396773 |
| each nutrient addition     |  5.349193 |
| 1/3 sugar break            |  1.033333 |

do an addition at 24, 48, 72 hours, and then at the 1/3rd sugar break or 1 week (whichever comes first)

* yeast ref

| Lalvin 71B                 | 0.75 |
| Lalvin BA 11               | 1.25 |
| Lalvin BM45                |  0.9 |
| Lalvin BM4X4               | 1.25 |
| Lalvin CLOS                |  0.9 |
| Lalvin CY3079              | 1.25 |
| Lalvin D21                 | 0.75 |
| Lalvin D254                |  0.9 |
| Lalvin D47                 | 0.75 |
| Lalvin D80                 |  0.9 |
| Lalvin DV10                | 0.75 |
| Lalvin EC-1118             | 0.75 |
| Lalvin K1V-1116            |  0.9 |
| Lalvin QA23                | 0.75 |
| Lalvin R2                  |  0.9 |
| Lalvin RC212               |  0.9 |
| Lalvin Rhone 2226          | 1.25 |
| Red Star Cote Des Blancs   | 1.25 |
| Red Star Montrachet        | 0.75 |
| Red Star Pasteur Champange | 0.75 |
| Red Star Pasteur Red       |  0.9 |
| Red Star Premier Cuvee     |  0.9 |
| Uvaferm 43                 | 0.75 |
| Uvaferm BDX                |  0.9 |
| Uvaferm SVG                |  0.9 |
| Uvaferm VRB                |  0.9 |
| Viti Levur 58W3            | 0.75 |
| Other Low N Requirement    | 0.75 |
| Other Medium N Requirement |  0.9 |
| Other High N Requirement   | 1.25 |
| Ale / Lager Yeast          | 0.75 |