What is the Sourdough Discard Calculator and Why Does It Matter?
Sourdough Discard Calculator calculate flour and water contained in sourdough discard. It turns discard grams, starter hydration % into a result you can check.
Think of sourdough discard like resizing a recipe card. The ingredients must grow or shrink together.
This page keeps the numbers and explanation together.
How the Math Works
flour = discard ÷ (1 + hydration/100); water = discard − flour
| Symbol | Meaning | Simple way to think about it |
|---|---|---|
| discard | Discard grams | The number you type for discard grams |
| hydration | Starter hydration % | The number you type for starter hydration % |
| result | Final answer | The number the calculator gives back |
Example: 200 g discard at 100% hydration = 100 g flour and 100 g water
- Enter the known values.
- Check that the units match.
- Apply the formula shown above.
- Read the final result.
Real-Life Examples
Example 1: Kid-friendly use
A kid doubles a cookie recipe for a party.
Example 2: Everyday adult use
A cook scales ingredients before making more servings.
Mistakes to Avoid
Mistake 1: Using volume when ingredient weight would be safer.
Mistake 2: A zero in the bottom part of a formula can break division.
Zero, negative, or huge values can change the meaning. The calculator blocks impossible inputs when the math would break.
Frequently Asked Questions
What happens if I enter zero?
Zero may give a zero result, or it may stop division. The page warns you when zero makes the math unsafe.
Why is this easier than doing it by hand?
It keeps the formula order steady. That reduces small arithmetic mistakes.
Can I use this with Cooking Converter or Air Fryer Converter?
Yes. Use Cooking Converter for a nearby question, and use Air Fryer Converter when the inputs match better.