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Sourdough Feeding Calculator

Calculate flour and water to feed a sourdough starter to a target amount and hydration.

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Inputs

g
g
%

Your values stay on this device.

Results

Flour to Add
Water to Add70
Final Starter165
Approx Feed Ratio25:70:70

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Assumptions

  • All prices, rates, package sizes, and recipe values are user-entered unless clearly labeled as a general planning default.
  • Calculations run locally in your browser and do not store food, nutrition, household, or budget details.
  • This is planning math, not nutrition, medical, allergen, or food-safety advice.

Sensitivity preview

Seed Starter -10%: Flour to Add 71.25 g

Seed Starter Current: Flour to Add 70 g

Seed Starter +10%: Flour to Add 68.75 g

Formula: Adjusted target = target starter x (1 + buffer percent). Feed weight = adjusted target - seed starter. Added flour and water are split by target hydration.

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About this Sourdough Feeding Calculator

A sourdough feed is easier to plan when the target starter weight and hydration are clear.

Who this calculator is for

  • Home cooks, meal planners, and households comparing practical kitchen assumptions.
  • Food budget planners estimating cost, servings, and ingredient tradeoffs.
  • Cooks who want transparent formulas instead of hidden recipe math.

When to use it

  • Scale a recipe, batch, food budget, or cooking estimate before shopping or prepping.
  • Compare one assumption at a time, such as servings, cost, hydration, brine strength, or time.
  • Document the math behind a cooking or grocery planning decision.

How to use this calculator

  1. Enter your own recipe, grocery, kitchen, or package values.
  2. Replace defaults with local costs, label values, weights, and time assumptions.
  3. Review the primary result and use the secondary outputs to check the formula.

Key assumptions

  • All prices, rates, package sizes, and recipe values are user-entered unless clearly labeled as a general planning default.
  • Calculations run locally in your browser and do not store food, nutrition, household, or budget details.
  • This is planning math, not nutrition, medical, allergen, or food-safety advice.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

New feed weight = target starter - seed starter. Flour to add = feed weight / (1 + hydration). Water to add = feed weight - flour to add.
Adjusted target = target starter x (1 + buffer percent). Feed weight = adjusted target - seed starter. Added flour and water are split by target hydration.

Inputs explained

Recipe or package inputs

Use values from your recipe, food label, package, or grocery receipt where possible.

Serving inputs

Servings, portions, bottles, meals, and batches should match the way you actually plan to use the food.

Rate inputs

Percentages, costs, times, and conversion factors are user-entered planning assumptions.

Understanding your results

Results are planning estimates based on your inputs. Ingredient brands, kitchen equipment, waste, taste, and package sizes can change the real result.

Example scenarios

Practical example

Starting with 25 g seed and building 150 g of 100% hydration levain requires about 62.5 g flour and 62.5 g water.

Key Features

  • Instant Calculation
  • Private & Secure
  • Mobile Optimized

Tips & Best Practices

  • Use weights instead of volume measurements when precision matters.
  • Run conservative and optimistic cases before buying ingredients in bulk.
  • Confirm safety-critical steps with official guidance, package directions, and a food thermometer.

Frequently Asked Questions

Are my food or budget details stored?
No. The calculation runs locally in your browser.
Should I use package labels or online averages?
Use package labels, receipts, and your own kitchen measurements when you have them. Averages are best for rough planning only.
Is this nutrition or food-safety advice?
No. It is a calculator for planning math. Confirm health, allergen, and food-safety decisions with appropriate official or professional guidance.