31:[] 2f:{"title":"Sourdough Calculator","cells":[{"id":0,"value":"md`# Sourdough Calculator\n\nA notebook to help me bake awesome [sourdough bread](https://en.wikipedia.org/wiki/Sourdough) using [baker's percentages](https://en.wikipedia.org/wiki/Baker_percentage). Enter the target bread parameters to calculate the recipe (ingredient weights).`","pinned":false,"hidden":false,"mode":"ojs"},{"id":572,"value":"viewof bread = form(html``)","pinned":false,"hidden":false,"mode":"ojs"},{"id":689,"value":"md`### Dough Recipe\n**${Math.round(flour)}**g of _flour_, \n**${Math.round(water)}**g of _water_, \n**${Math.round(levain)}**g of _levain_ \nand **${Math.round(10 * salt) / 10}**g of _salt_, fermented for ~**${Math.round(2 * hours_to_ferment) / 2}** hours.\n`","pinned":false,"hidden":false,"mode":"ojs"},{"id":482,"value":"{\n const h = 50;\n const ctx = DOM.context2d(width, h);\n const fw = width * flour / bread.weight;\n const lw = width * levain / bread.weight;\n const ww = width * water / bread.weight;\n\n ctx.fillStyle = 'bisque';\n ctx.fillRect(0, 0, fw, h);\n ctx.fillStyle = '#F5CBA7';\n ctx.fillRect(fw, 0, lw, h);\n ctx.fillStyle = '#D0ECE7';\n ctx.fillRect(fw + lw, 0, ww, h);\n ctx.fillStyle = '#ddd';\n ctx.fillRect(fw + ww + lw, 0, width - fw - ww - lw, h);\n\n ctx.fillStyle = 'black';\n ctx.textAlign = 'center';\n ctx.textBaseline = 'middle';\n ctx.font = '14px sans-serif';\n ctx.fillText('Flour', fw / 2, h / 2);\n ctx.fillText('Levain', fw + lw / 2, h / 2);\n ctx.fillText('Water', fw + lw + ww / 2, h / 2);\n \n return ctx.canvas;\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":971,"value":"md`\nNote that the actual fermentation time can vary widely depending on starter health, the flour used, etc., so you should always watch the dough instead of the clock (shooting for ~50% volume rise before shaping).\n\n## Reverse calculator`","pinned":false,"hidden":false,"mode":"ojs"},{"id":976,"value":"viewof ingredients = form(html``)","pinned":false,"hidden":false,"mode":"ojs"},{"id":993,"value":"{\n const total_water = ingredients.water + bread.levain_hydration * ingredients.levain / (100 + bread.levain_hydration);\n const total_flour = ingredients.flour + 100 * ingredients.levain / (100 + bread.levain_hydration);\n \n return md`### Resulting Dough\n\n ${Math.round(ingredients.flour + ingredients.water + ingredients.salt + ingredients.levain)} \n grams of dough with ${Math.round(1000 * total_water / total_flour) / 10}% hydration, \n ${Math.round(1000 * ingredients.levain / total_flour) / 10}% levain and ${Math.round(1000 * (ingredients.salt / total_flour)) / 10}% salt.\n `;\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":209,"value":"md`## Calculations`","pinned":false,"hidden":false,"mode":"ojs"},{"id":933,"value":"total_flour = bread.weight * 100 / (100 + bread.hydration + bread.salt)","pinned":true,"hidden":false,"mode":"ojs"},{"id":199,"value":"levain = total_flour * bread.levain / 100","pinned":true,"hidden":false,"mode":"ojs"},{"id":229,"value":"salt = total_flour * bread.salt / 100","pinned":true,"hidden":false,"mode":"ojs"},{"id":948,"value":"levain_flour = levain * 100 / (100 + bread.levain_hydration)","pinned":true,"hidden":false,"mode":"ojs"},{"id":950,"value":"levain_water = levain - levain_flour","pinned":true,"hidden":false,"mode":"ojs"},{"id":156,"value":"flour = total_flour - levain_flour","pinned":true,"hidden":false,"mode":"ojs"},{"id":172,"value":"water = total_flour * bread.hydration / 100 - levain_water","pinned":true,"hidden":false,"mode":"ojs"},{"id":389,"value":"md`Fermentation time prediction is based on [this model](https://www.pizzamaking.com/forum/index.php?topic=22649.0), although actual time will vary and depend on how active the starter is and the amount of salt among other things.`","pinned":false,"hidden":false,"mode":"ojs"},{"id":404,"value":"hours_to_ferment = {\n const f = bread.proof_temp * 9 / 5 + 32;\n return Math.log(bread.levain / 100 / 0.894) * (-0.0000336713 * f ** 4 + 0.0105207916 * f ** 3 - 1.2495985607 * f ** 2 + 67.0024722564 * f - 1374.6540546564);\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":797,"value":"md`## Appendix`","pinned":false,"hidden":false,"mode":"ojs"},{"id":212,"value":"round = n => Math.round(n)","pinned":false,"hidden":false,"mode":"ojs"},{"id":614,"value":"import {form} from '@mbostock/form-input'","pinned":false,"hidden":false,"mode":"ojs"},{"id":854,"value":"html``","pinned":false,"hidden":false,"mode":"ojs"}],"files":"$W31","stdlib":"1","titling":"auto"}

Target Bread

Ingredients