Sourdough Starter Scale Calculator
Scale one ingredient in sourdough starter from an original yield to a target yield. Enter your own quantities and see the worked example.
How to use Sourdough Starter Scale Calculator
1. Enter Original Ingredient Quantity, Original Yield, Target Yield in the matching stated or selected unit. 2. Original yield must be positive. Use one consistent yield basis, such as portions or pre-bake dough weight. Apply the factor to each ingredient separately. 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 scale one ingredient in sourdough starter from an original yield to a target yield. 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
New ingredient quantity = original ingredient quantity × target yield ÷ original yield. Original yield must be positive. Use one consistent yield basis, such as portions or pre-bake dough weight. Apply the factor to each ingredient separately. 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.
Example
Sourdough Starter example: 500 g for a yield of 4, scaled to a yield of 6, gives 500 × 6 ÷ 4 = 750 g.
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 scale calculator calculate?
Original yield must be positive. Use one consistent yield basis, such as portions or pre-bake dough weight. Apply the factor to each ingredient separately.
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.