Hydration Calculator
Find total dough hydration including starter and additional water needed for a supplied target.
Open toolSourdough Starter Calculator
Find starter, flour and water masses for a supplied feeding ratio and target weight. Provide Starter currently retained (g), Target fed-starter mass (g), Starter ratio parts to compute results directly in your browser. Ratio parts are mass proportions; current retained starter only determines surplus or shortfall. Assumes unchanged mass while mixing, no fermentation-time, activity or food-safety prediction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur. Common search workflows supported include "sourdough ratio calculator", "sourdough starter calculator", "sourdough calculator".
Free to useNo sign-upRuns in your browser
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Enter the inputs, then select Calculate.
Your result
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Result will appear here
How the Sourdough Starter Calculator Works & Core Formula
The Sourdough Starter Calculator evaluates Starter currently retained (g), Target fed-starter mass (g), Starter ratio parts in client-side JavaScript using the deterministic rule below and updates the output panel immediately without uploading data to a server.
Find starter, flour and water masses for a supplied feeding ratio and target weight.
Ratio parts are mass proportions; current retained starter only determines surplus or shortfall. Assumes unchanged mass while mixing, no fermentation-time, activity or food-safety prediction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur.
Sourdough Starter Calculator Quick Reference & Input Guide
Review the input parameters, allowed value ranges, and worked reference cases for the Sourdough Starter Calculator below before running your calculation.
| Parameter / Scenario | Default / Sample Value | Rule or Allowed Range | Output / Usage Note |
|---|---|---|---|
| Input: Starter currently retained (g) | 20 | Range: 0 to 1000000000.0 | Required workspace parameter |
| Input: Target fed-starter mass (g) | 100 | Range: 1e-09 to 1000000000.0 | Required workspace parameter |
| Input: Starter ratio parts | 1 | Range: 1e-09 to 1000000000.0 | Required workspace parameter |
| Input: Flour ratio parts | 2 | Range: 0 to 1000000000.0 | Required workspace parameter |
| Worked Case 1: Baseline run (Starter currently retained (g) = 20) | Preloaded / test values | Find starter, flour and water masses for a supplied feeding ratio and target weight | Starter currently retained (g) = 20; Target fed-starter mass (g) = 100; Starter ratio parts = 1; Flour ratio parts = 2; Water ratio parts = 2. The displayed output is Starter needed: 20 g Flour to add: 40 g Water to add: 40 g Retained surplus or shortfall: 0 g. |
| Worked Case 2: Comparison scenario (sourdough starter calculator free) | Preloaded / test values | Find starter, flour and water masses for a supplied feeding ratio and target weight | Starter currently retained (g) = 30; Target fed-starter mass (g) = 140; Starter ratio parts = 1; Flour ratio parts = 3; Water ratio parts = 3. The displayed output is Starter needed: 20 g Flour to add: 60 g Water to add: 60 g Retained surplus or shortfall: 10 g. |
Step-by-Step Guide to Using the Sourdough Starter Calculator
Follow these three steps to configure Starter currently retained (g), Target fed-starter mass (g), Starter ratio parts, verify unit and boundary rules, and export your Sourdough Starter Calculator output.
Enter starter currently retained (g)
Enter starter currently retained (g). Allowed range: 0 to 1000000000.
Input and settings
Complete the other inputs
Set target fed-starter mass (g), starter ratio parts, flour ratio parts, water ratio parts. Supply the target fed-starter mass and starter, flour and water ratio parts by mass.
Tool result
Calculate and read the output
Select Calculate to see the required component masses and retained-starter surplus or shortfall. Copy result copies this text; Download saves it as a TXT file.
Review the details
Practical Worked Examples for Sourdough Starter Calculator
These concrete scenarios illustrate how the Sourdough Starter Calculator processes baseline inputs, comparison checks, and boundary constraints.
Baseline run (Starter currently retained (g) = 20)
Starter currently retained (g) = 20; Target fed-starter mass (g) = 100; Starter ratio parts = 1; Flour ratio parts = 2; Water ratio parts = 2. The displayed output is Starter needed: 20 g Flour to add: 40 g Water to add: 40 g Retained surplus or shortfall: 0 g.
Comparison scenario (sourdough starter calculator free)
Starter currently retained (g) = 30; Target fed-starter mass (g) = 140; Starter ratio parts = 1; Flour ratio parts = 3; Water ratio parts = 3. The displayed output is Starter needed: 20 g Flour to add: 60 g Water to add: 60 g Retained surplus or shortfall: 10 g.
Boundary & unit check (Sourdough Ratio Calculator)
When solving for 'sourdough ratio calculator', verify that Starter currently retained (g), Target fed-starter mass (g), Starter ratio parts use consistent units and stay within the documented scope: Ratio parts are mass proportions; current retained starter only determines surplus or shortfall. Assumes unchanged mass while mixing, no fermentation-time, activity or food-safety prediction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur.
How to Read and Verify the Sourdough Starter Calculator Output
The output panel reports the exact result derived from Starter currently retained (g), Target fed-starter mass (g), Starter ratio parts alongside any unit or formatting notes.
The result is the required component masses and retained-starter surplus or shortfall. Plan a feeding mixture under a stated mass ratio.
The model treats mixing as mass-preserving and does not estimate fermentation time, starter activity or food safety.
Numerical output shows up to 12 significant digits. Floating-point arithmetic and display rounding can affect the last digits.
- Example input
- Starter currently retained (g) = 20; Target fed-starter mass (g) = 100; Starter ratio parts = 1; Flour ratio parts = 2; Water ratio parts = 2
- Example output
- Starter needed: 20 g Flour to add: 40 g Water to add: 40 g Retained surplus or shortfall: 0 g
Scope Limits, Accuracy Assumptions & Related Everyday Math Tools
Review these boundary constraints and validation rules before relying on the Sourdough Starter Calculator output.
Operational scope: Ratio parts are mass proportions; current retained starter only determines surplus or shortfall. Assumes unchanged mass while mixing, no fermentation-time, activity or food-safety prediction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur. Inputs that violate minimum/maximum bounds or required format rules are rejected with a clear diagnostic prompt.
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Open toolFrequently Asked Questions About Sourdough Starter Calculator
Answers about using Sourdough Starter Calculator and understanding its results.
How do I calculate sourdough ratio calculator using the Sourdough Starter Calculator?
The Sourdough Starter Calculator applies the rule: Find starter, flour and water masses for a supplied feeding ratio and target weight. Enter Starter currently retained (g), Target fed-starter mass (g), Starter ratio parts into the workspace and the tool computes the exact output in your browser.
Can I use this tool for sourdough starter calculator?
Yes. Provide Starter currently retained (g), Target fed-starter mass (g), Starter ratio parts using the documented units and format shown in the quick reference table above. Preloaded default values let you test the workflow immediately.
What are the accuracy limits and boundary assumptions for Sourdough Starter Calculator?
Ratio parts are mass proportions; current retained starter only determines surplus or shortfall. Assumes unchanged mass while mixing, no fermentation-time, activity or food-safety prediction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur. Confirm that your inputs fall within the allowed ranges before exporting the result.
Is the Sourdough Starter Calculator free and does it keep my inputs private?
Yes. All calculations for the Sourdough Starter Calculator execute 100% locally in your browser's JavaScript runtime. No inputs or results are uploaded to any external server.
Get the required component masses and retained-starter surplus or shortfall
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