What Is the Sourdough Discard Calculator?

Sourdough discard is the portion of starter removed before feeding. It's too acidic and depleted to leaven bread on its own, but it's full of flavour — perfect for pancakes, waffles, crackers, flatbreads, and muffins. DoughRise's free Sourdough Discard Calculator adjusts any recipe to incorporate your discard, recalculating flour and water quantities so texture and hydration stay on target.

How to Use Discard Without Ruining Your Recipe

Discard is typically 100% hydration (equal parts flour and water by weight). When you substitute it into a recipe, you're adding both flour and moisture — so you need to reduce the recipe's flour and water accordingly. The calculator handles this automatically.

Open the Free Sourdough Discard Calculator →

Frequently Asked Questions

Can you use sourdough discard straight from the fridge?

Yes — for most quick-bake recipes like pancakes, waffles, and crackers. For longer-fermented discard (7+ days), the sour flavour intensifies and works well in savoury recipes but can overpower sweet ones.

How much discard can I substitute in a recipe?

As a rule of thumb, substitute up to 20–30% of the total flour weight as discard. Going higher risks overly sour results or affecting leavening if the recipe uses baking powder that reacts with the discard's acidity.

Does discard have any leavening power?

A small amount — but not enough to leaven bread reliably. Use discard recipes that call for baking powder, baking soda, or commercial yeast as the primary leavener. The sour flavour comes from the discard; the rise from the added leavener.