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How Much Does Sourdough Starter Cost? 2026 Feeding Math
A clear way to price your starter's flour, water, and feeding time, and what each loaf owes it.
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There is no sticker on a jar of starter, so the question needs a different shape. When you ask how much does it cost for sourdough starter, you are really asking what each feeding takes out of your pocket and what each loaf owes back. Work it out once and the guessing stops.
What to remember
- You pay for flour, water, the jar, and the minutes you spend feeding.
- A starter is a weekly cost you spread across every loaf it raises.
- Pouring out discard is pouring out flour you already bought.
- Your own receipts are the only prices that matter in your kitchen.
What your starter actually costs you
Four things go into a jar: flour, water, the container, and your minutes. Flour is the line that moves, because bag prices change and your feeding schedule changes with your orders. Water and the jar stay small and steady.
The line home bakers leave off is time. Feeding happens daily, whether or not you have an order that day, and those minutes have a value even when no customer sees them. Write them down or the starter will look free when it is not.
Every feeding also pours some starter away. That is flour you bought and will not sell unless you bake with it. The full cost of a homemade sourdough batch shows where that discard lands next to your other ingredients.
Cost one week of feedings in five steps
Track the flour for seven days
Keep a note by the jar. Write down the flour that goes in each feeding, including the flour in what you pour off.
Turn your bag price into a pound price
Divide what you paid for the bag by the number of pounds in it. That gives your cost per pound, and it changes every time you shop.
Add water, jar, and power
Water is pennies. Divide the jar price by the months it lasts, and add a small share of your kitchen power for the week.
Put a dollar value on feeding time
Add the minutes you spend feeding in a week. Multiply by the hourly rate you pay yourself, then divide by 60.
Divide by the loaves that week raised
Count the loaves that starter made possible. Divide the weekly total by that count and you have your starter cost per loaf.
A worked example, from jar to loaf price
The figures below are an example, not a market price. Swap in what you actually paid and what you actually want to earn. The shape of the math stays the same.
One week of feeding uses 3 pounds of flour at $1.10 a pound, which is $3.30. Water is about 5 cents, and the jar plus the power to run your kitchen adds 65 cents. That is $4.00 before your time. Forty minutes of feeding at $18 an hour adds $12.00, so the week costs $16.00.
That week’s starter raised eight loaves, so each loaf carries $2.00 of starter. Now cost one loaf. Other ingredients are $2.10. Your time is 20 minutes at $18 an hour, which is $6.00, and packaging and power come to $1.40. Add the $2.00 starter and the loaf costs $11.50. At a $14.00 price your margin is $2.50.
Mistakes that make your starter cost more
How the cost per loaf falls as you bake more
The jar that costs $2.00 a loaf at eight loaves costs less per loaf at sixteen. Flour and water grow with the loaves, but the jar, the scale, and the drive to the store do not. More bakes from the same feedings shrink the starter line.
Check that against your week before you promise a bigger menu. What a loaf of sourdough really costs shows how the final number lands once the bread is on a table with a price tag.
Put the starter on your price sheet
Add one line to your notes called starter cost per loaf and fill it in from the weekly total. Update it when the flour price moves, and keep the old figure until you have a new receipt to replace it.
If the margin is thinner than you want, change one number at a time. Shrink the jar, raise the loaf price, or bake more from the same feedings. Then check the effect on your monthly baking costs before you commit to a new schedule.
- What to charge for sourdough bagels
- What to charge for sourdough scones
- Your monthly baking costs in plain numbers
Common questions
Does a free starter from a friend really cost nothing?
The starter itself is free, but you still feed it. Flour, water, a jar, and your minutes all carry a cost from the first day. Ask for a small amount, then cost your own feedings before you set a loaf price.
How much starter should I keep so I do not overspend on flour?
Keep only what your next bake needs plus a little to carry on. A smaller jar means less flour per feeding and less discard you already paid for. Measure what you use for two weeks, then shrink the jar to match.
Should I list the starter as a separate charge?
No. Fold it into the loaf price. Customers buy bread, not jar maintenance. Work out the starter cost per loaf, add it to your ingredient line, and let the final price cover it without a separate fee.
What happens to my cost if I forget to feed it?
A neglected jar is flour you already paid for. If you have to restart, that week's flour is a loss you cannot pass on to a customer. Keep a small backup jar so one busy week does not take your whole plan with it.
Do I count the jar and the scale?
The scale is a tool you use for years, so spread its price across the bakes it serves. The jar works the same way. Divide what you paid by the months you expect to use it, then take the weekly share.
General information for pricing your own baking, not legal or tax advice. Your costs come from your own receipts.