A Crust & Crumb Academy Lesson

The Market Levain

Small mother. Big builds. No guessing. Feeding for 12 to 24 loaves without wrecking your schedule.

4L3L 2L1L
peak
Market
Levain
From Oven to Market  |  Crust & Crumb Academy
The Shift

Your starter did not get harder. The job got bigger.

Personal jar

A few spoonfuls for one or two loaves. You can feed by habit.

Production levain

A planned build for a real batch. Weight and timing matter.

Market dough

Twelve, twenty-four, or more loaves. No guessing.

Rule: keep the mother small. Build only the levain you need.
The Production System

Three things, three jobs.

This keeps one bad week from taking out your whole starter.

1. Mother

Small, clean, protected. This is not the bucket you gamble with.

2. Levain build

The exact amount you need for the batch, plus a little cushion.

3. Dough

Only mix when the levain is ripe. Bubbly, lifted, and smelling alive.

The Math

Do the math before you feed.

A market bake needs a number, not a feeling.

Levain needed = loaves × levain per loaf × 1.10

The extra 10% covers what sticks to the bowl, scale, spoon, and container.

Base loaf

500 g flour
100 g ripe starter or levain

12 loaves

12 × 100 g × 1.10

0 g levain
24 loaves

24 × 100 g × 1.10

0 g levain
Levain Calculator

Build the levain before you build the dough.

Assumes a 100% hydration levain, equal flour and water by weight.
Total parts = 1 + r + r  ·  Seed = total ÷ parts  ·  Water = seed × r  ·  Flour = seed × r

Total levain target1,320 g
Seed starter (from the mother)264 g
Water528 g
Flour528 g

Your build fills the container. Give it room to rise.

Build Card

Two common builds for 12 and 24 loaves.

These are 100% hydration levain examples.

BatchLevain target1:2:2 build1:4:4 build
12 loaves1,320 g264 g seed, 528 g water, 528 g flour147 g seed, 587 g water, 587 g flour
24 loaves2,640 g528 g seed, 1,056 g water, 1,056 g flour293 g seed, 1,173 g water, 1,173 g flour

Use 1:2:2 when you need it sooner. Use 1:4:4 when you want a slower overnight build.

Clock Control

Your feed ratio is the steering wheel.

More seed means faster. Less seed means more time.

Faster build

1:1:1 or 1:2:2

Useful for same-day mixing or a cool kitchen.

Peaks sooner
Middle road

1:3:3

Good when your room is steady and you know the starter.

Steady pace
Slower build

1:4:4 or 1:5:5

Useful for overnight builds or a warm kitchen.

Long, stretched window
Rule: do not chase the clock. Watch the levain: rise, bubbles, dome, smell.
Work Backward From Mix Time

Your levain needs to peak when you need it.

Do not feed it and hope. Work backward. Example: Friday 7 PM mix for a Saturday market bake.

Feed
Mix

1. Pick your mix time.  2. Choose the ratio.  3. Feed with a cushion.  4. Mix only when the levain is ripe.

The Container

Use a bucket that can handle the rise.

A 2.6 kg levain can surprise you. Give it room.

  • At least 3x headroom
  • Clear sides or a tape mark
  • Loose lid, never airtight
  • Label: weight, ratio, feed time
  • Scrape the sides clean so you can read the rise
3x headroom
fill line
Weight · ratio · feed time on the label
Between Bakes

A working starter needs a weekly rhythm.

You are not babying it. You are keeping it ready.

Market week

Feed the mother for two clean cycles before a large build. You want predictable strength.

Off week

Keep the mother small. Refrigerate after feeding if you are not baking for several days.

Backup

Keep 50 to 100 g separate in the fridge, and keep a dried backup if this business matters.

The goal is not a giant starter. The goal is a small mother that can build big when asked.
The Judgment Call

Do not mix from a sluggish levain.

At volume, one weak build can cost the whole batch.

Ready to mix

  • Doubled or close
  • Bubbly through the sides
  • Domed or just starting to flatten
  • Smells clean, tangy, alive

Do not use yet

  • Flat with few bubbles
  • Sharp solvent smell
  • No lift after expected time
  • Separated or weak
When in doubt, give the mother one more feeding and adjust the schedule.
Market-Week Checklist

Post your starter build plan.

We will help you catch the math before market week catches you.

  1. How many loaves am I baking?
  2. How much levain does each loaf need?
  3. What is my total levain target with 10% cushion?
  4. What feed ratio fits my mix time and kitchen temp?
  5. Is my container big enough for a full rise?
  6. Where is my backup starter if this build goes sideways?
Loaves: ____ Levain per loaf: ____ g Total levain with cushion: ____ g Feed ratio: ____ Feed time: ____ Mix time: ____ Container size: ____

Your starter is part of production now. Treat it like equipment, not a pet.

Keep Going

This is the kind of math we teach every week.

Starter builds, batch scaling, pricing, packaging, market prep. That is what From Oven to Market covers, start to finish. Take the 62-second quiz inside the community and we will point you at exactly where to start. Then take the course and build the business.

Join From Oven to Market

Take the 62-second quiz when you get inside. It gets you into the system and matched to the right lessons.

From Oven to Market  |  Crust & Crumb Academy
Presenter note