Sourdough Starter Target Quantity Calculator
Calculate an ingredient weight for sourdough starter from flour weight and a chosen baker’s percentage. Enter your own quantities and see the worked example.
How to use Sourdough Starter Target Quantity Calculator
1. Enter Flour Weight, Target Baker's % in the matching stated or selected unit. 2. Flour weight must be positive and the entered percentage non-negative. This calculates your selected percentage; it does not recommend a formula. The tool handles the entered ingredient and flour weights only. It does not infer a feeding ratio, fermentation readiness or flour and water contained in an existing starter. 3. Select Calculate or press Enter to see the result. 4. Select Select Copy result to copy the answer, or Reset to clear the form.
Why use this tool?
Use this tool to calculate an ingredient weight for sourdough starter from flour weight and a chosen baker’s percentage. Define the flour basis explicitly. If you need total hydration, account for the flour and water in the starter before entering totals.
How the calculation works
Ingredient weight = flour weight × chosen baker’s percentage ÷ 100. Flour weight must be positive and the entered percentage non-negative. This calculates your selected percentage; it does not recommend a formula. The tool handles the entered ingredient and flour weights only. It does not infer a feeding ratio, fermentation readiness or flour and water contained in an existing starter. Decimal quantity arithmetic uses the entered values before display rounding. Quantities use up to six decimal places; smaller nonzero results use scientific notation. Currency uses the selected currency’s minor unit. Inputs and numeric results are bounded by magnitude 9,007,199,254,740,991. Baker’s percentage reference: https://www.kingarthurbaking.com/pro/reference/bakers-percentage
Example
Sourdough Starter example: 500 g flour × a chosen 65% ÷ 100 = 325 g of the ingredient.
Practical tip
Define the flour basis explicitly. If you need total hydration, account for the flour and water in the starter before entering totals.
Frequently asked questions
What does this sourdough starter target quantity calculator calculate?
Flour weight must be positive and the entered percentage non-negative. This calculates your selected percentage; it does not recommend a formula.
Which assumptions matter for sourdough starter?
The tool handles the entered ingredient and flour weights only. It does not infer a feeding ratio, fermentation readiness or flour and water contained in an existing starter.
How should I interpret the units and rounding?
Quantity selectors describe the unit of all matching inputs and do not convert filled values. Calculated quantities use up to six decimal places, with scientific notation for smaller nonzero results. Serving and portion equivalents can be fractional. Percentages and compound-weight remainders use up to two decimal places. Costs use the selected currency’s minor unit; smaller positive costs are labelled explicitly.