Convert 50g Sourdough Starter (100% Hydration) to Commercial Yeast
How to remove 50g of 100% hydration levain from any sourdough recipe by restoring +25g flour and +25g water.
A 100% hydration starter is half flour and half water by weight, so 50 g of it hides 25g of flour and 25g of water. Deleting it without restoring both shrinks the loaf and skews the ratio away from 71.6%. Restoring them and dosing 6.7g of yeast keeps the dough identical.
- Add Back Flour
- +25gReplaces flour inside 50g (100%) starter
- Add Back Water
- +25gReplaces water inside 50g (100%) starter
- Instant Yeast (2-Hr Rise)
- 6.7g (2.1 tsp)For 475g total flour batch
- Preserved Hydration
- 71.6%340g W / 475g F
Instant, Active Dry & Fresh Yeast for 50g of 100% Starter
Calculated on a 450g main flour + 25g restored starter flour (475g total flour) batch.
| Target Fermentation Schedule | Instant Dry Yeast (IDY) | Active Dry Yeast (ADY) | Fresh Compressed Yeast | Required Dough Restoration |
|---|---|---|---|---|
| [Your Batch]: 30g starter at 100% | instant 6.5g | active dry 8.1g | fresh 19.5g | bake 1.5 – 2.0 hours warm bulk rise |
| Scaled Down: 50g starter at 100% | instant 3.3g | active dry 4.2g | fresh 10g | bake 3.5 – 4.5 hours slow room-temp rise |
| Scaled Up: 70g starter at 100% | instant 1.2g | active dry 1.5g | fresh 3.6g | bake 12 – 18 hours cold fermentation (39°f / 4°c) |
| Trimmed: 40g starter at 100% | instant 6.6g | active dry 8.2g | fresh 19.7g | bake 1.5 – 2.0 hours warm bulk rise |
| Expanded: 60g starter at 100% | instant 3.4g | active dry 4.2g | fresh 10.1g | bake 3.5 – 4.5 hours slow room-temp rise |
Live Parameter Solver for Convert 50g Sourdough Starter (100% Hydrat
Dial in custom baker's percentages and export your adjusted +25g formula for bake day.
Decomposing 50g of 100% Hydration Starter: Flour + Water Conservation
Bread-machine and no-knead schedules suit this conversion particularly well. Without a levain to manage, the 475g / 340g dough and its 6.7g of yeast can be programmed once and repeated without a single judgement call about starter readiness.
Punching down, shaping and retarding are the stages that a levain dough was really buying you. Removing the starter removes that work, so plan the 1.5 – 2.0 hours warm bulk rise as a single continuous bulk and shape only once, at the end.
Step-by-Step Reverse Conversion Protocol (50g @ 100%)
- Dissolve the Yeast: Bloom 6.7g of instant yeast in a little of the 25g restored water at 100°F (38°C) so it disperses evenly through the 475g of flour.
- Combine Dry and Wet: Add the 25g of restored flour to the original flour, pour in the 340g of water and the yeast slurry, and mix until no dry flour remains.
- Add Salt Last: Work 2% salt into the dough and continue mixing until a windowpane forms.
- Single Bulk, No Folds Needed: Let the dough rise undisturbed for 1.5 – 2.0 hours warm bulk rise, then shape, prove briefly and bake.
Cereal Chemistry & Bench Execution FAQs
How much grain and water are inside 50g of 100% hydration starter?
50g of 100% hydration sourdough starter contains 25g grain and 25g water.
Can I use Active Dry Yeast instead of Instant Yeast to replace 50g starter?
Yes — multiply the 6.7g Instant Yeast weight by 1.25x and dissolve it in warm (100°F / 38°C) water from your 25g water addition.
Can I convert a stiff 50% levain to yeast?
Yes, and the deduction is larger on the flour side: 50g at 50% hydration holds 33g flour and 17g water rather than the 25g / 25g of a 100% starter.