Sourdough hydration calculator
Open Sourdough hydration calculator on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.
Tool capabilities
{
"id": "sourdough-hydration-calculator",
"category": "calculators",
"built": true,
"requirements": "Starter is treated as flour and water only. Water in eggs, dairy and other ingredients is not inferred. Negative required added water is rejected.",
"implementation": {
"fields": [
{
"key": "mode",
"label": "Calculate",
"value": "Measure existing dough",
"type": "select",
"values": [
"Measure existing dough",
"Reach target hydration"
]
},
{
"key": "flour",
"label": "Flour added outside the starter",
"value": 500,
"type": "number",
"min": 0,
"max": 100000000,
"step": "any"
},
{
"key": "water",
"label": "Water added outside the starter",
"value": 300,
"type": "number",
"min": 0,
"max": 100000000,
"step": "any",
"showWhen": {
"mode": [
"Measure existing dough"
]
}
},
{
"key": "starter",
"label": "Starter mass",
"value": 100,
"type": "number",
"min": 0,
"max": 100000000,
"step": "any"
},
{
"key": "starterHydration",
"label": "Starter hydration (%)",
"value": 100,
"type": "number",
"min": 0,
"max": 500,
"step": "any"
},
{
"key": "targetHydration",
"label": "Target overall hydration (%)",
"value": 70,
"type": "number",
"min": 0,
"max": 300,
"step": "any",
"showWhen": {
"mode": [
"Reach target hydration"
]
}
},
{
"key": "massUnit",
"label": "Mass unit",
"value": "g",
"type": "select",
"values": [
"g",
"kg",
"oz",
"lb"
]
}
],
"input": false,
"live": true,
"presentation": "metrics",
"note": "Count starter flour and water in the overall hydration, or calculate separate water needed for a target. Other ingredients’ water is not inferred. Calculated on your device. Changing units keeps the entered numbers.",
"experience": {
"automatic": true,
"single": false,
"inputMaxLength": 1000000,
"inputMode": "text",
"label": "Your text",
"placeholder": "Type or paste your input…",
"help": "Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.",
"helpParts": [
"Change the input or settings to update your result.",
"Results update as you type.",
"Up to 1,000,000 characters."
],
"action": null
},
"mode": "automatic",
"interactive": false
},
"execution": "Browser interface",
"api": null,
"browser_agent": {
"supported": true,
"name": "run_current_tool",
"discovery": "WebMCP on the human page in a supporting browser",
"verification": "See audit/API-AUDIT.md; availability is not verification"
}
}Page guide
Calculate overall hydration including your starter, or find the separate water needed for a target hydration.
How to use Sourdough hydration calculator
- Enter the measurements and assumptions for this recipe or plan.
- Review the calculated quantities and their stated basis.
- Download the report and verify it against your measured result.
Useful next steps
Count the starter contributions
A 100 g starter at 100% hydration contains 50 g flour and 50 g water. Added to 500 g flour and 300 g water, the overall dough is about 63.64% hydration.
Solve for the next mix
Switch to Reach target hydration to calculate added water while holding flour and starter fixed. At 70% in the example, add 335 g water outside the starter.
Save the result
Download CSV and a text or JSON report with the calculation and its assumptions. Processing stays on your device. Check measurements and selected units before using the result.