Sourdough Starter Grams to Cups Converter
How many grams is 1 cup of sourdough starter? Use this approximate converter for cups, grams, hydration, and the flour and water your starter contains.
Result
—
Approximate conversion
— grams
- Starter weight
- —
- Flour in the starter
- —
- Water in the starter
- —
Expect variation. Activity, aeration, scooping and hydration can change volume weight by 20% or more. Use a scale when accuracy matters.
100% hydration reference weights
| Volume | Approximate weight |
|---|---|
| 1 cup | 227 g |
| ½ cup | 113 g |
| ¼ cup | 57 g |
| 1 tablespoon | 14 g |
| 1 ounce | 28.35 g |
· Free
Track it in Sourdough Tracker.
Plan feedings, track starter notes and keep your sourdough routine organized on your device.
Why a cup of starter is only approximate
How many grams is 1 cup of sourdough starter? At 100% hydration, one US cup is commonly treated as about 227 g, but a cup can vary by 20% or more. A peaked, bubbly starter is much lighter than a freshly stirred or sluggish starter, and scooping changes the result too.
This converter adjusts the 227 g reference approximately for hydration. A stiff 50–60% starter is denser per cup than a 100% starter. Because volume is so variable, weighing your starter on a scale is the reliable choice.
At 100% hydration, the starter is half flour and half water by weight. Those flour and water amounts should come out of a recipe when you substitute starter, so the dough hydration stays right.
Approximate grams per cup = 227 × 200 ÷ (100 + hydration%) Reference volumes: 1 US cup = 236.588 mL, 1 tablespoon = 14.787 mL, and 1 ounce = 28.349523125 g. The volume-weight relationship is approximate, not a promise of precision. See the sourdough hydration calculator and starter feeding amount calculator for related calculations.
Sourdough starter grams to cups FAQ
How many grams is 1 cup of sourdough starter?
A 100% hydration starter is commonly estimated at about 227 g per US cup. It can vary by 20% or more with activity, aeration, scooping and hydration, so use a scale when accuracy matters.
How much flour and water are in 227 g of starter?
At 100% hydration, 227 g contains about 113 g flour and 113 g water. Remove those amounts from the flour and water in a recipe when substituting starter.
Why does starter hydration change its weight per cup?
A stiff starter at 50–60% hydration is denser per unit volume than a 100% hydration starter, so the same cup can weigh more. The adjustment in this tool is approximate.
Is a bubbly starter lighter than a stirred starter?
Yes. A peaked, bubbly starter contains more aeration, while freshly stirred or sluggish starter can pack more densely into the same volume. That is a major reason volume measures vary.
Should I measure sourdough starter by cups or grams?
Use grams and a kitchen scale when possible. The cup conversion is useful for a quick estimate, but weighing avoids the large variation caused by activity, bubbles and scooping.