The True Cost of Keeping a Sourdough Starter Alive
A sourdough starter is one of the cheapest hobbies you can keep — until you start adding up the flour. A typical 1:1:1 feeding (equal parts starter, flour, and water by weight) uses 50 grams of flour per session. At a grocery-store price of around $0.89 per pound of all-purpose flour, that works out to roughly $0.10 per feeding. Feed daily and you will spend about $0.70 a week, or under $37 a year. Switch to a higher-quality bread flour or whole wheat, and that number can double. Knowing the actual cost lets you decide whether to splurge on specialty flours or stick to the house brand for everyday maintenance.
The biggest variable most bakers overlook is feeding frequency. A starter kept at room temperature during an active baking season needs daily feeding, but one stored in the fridge between bakes only needs attention once a week or even less. Dropping from seven feedings a week to one can cut your annual flour spend from $37 to under $6. If you take occasional starter vacations — storing it in the fridge for weeks at a time — your real cost per year may be closer to $10–$15 even with daily feeding when you are actively baking. Use this calculator to model both your active and dormant phases to get an honest annual figure.
One-time setup costs are easy to forget. A quality wide-mouth glass jar with a loose lid runs $6–$12 and will last for years. Some bakers keep two jars — one for the active starter and one for discard — which doubles that cost. If you buy an established starter online from a heritage culture seller, expect to spend $10–$30 before feeding costs begin. Growing one from scratch costs only flour and time, but starter reliability varies and the first two weeks can be inconsistent. This calculator helps you compare both paths so you can decide which approach makes more sense for your kitchen and baking goals.
Frequently Asked Questions
How much flour does a sourdough starter actually use per feeding?
A standard 1:1:1 feeding ratio uses equal weights of starter, flour, and water. If you maintain a 50g starter, each feeding adds 50g of flour and 50g of water. Bakers who keep a smaller starter — some go as low as 20–30g — can cut flour use significantly. The "discard" portion you remove before feeding is not consumed, so it does not add to your cost, though it does represent flour you already spent in prior feedings.
Is it cheaper to grow a starter from scratch or buy one online?
Growing your own from scratch costs only flour — typically $1–$3 worth over the first two weeks. Buying an established starter online costs $10–$30 but gives you a more predictable, proven culture from day one. If your time and consistency are limited, a purchased starter can save weeks of uncertainty. Over the long run, feeding costs are identical regardless of origin, so the only real difference is that upfront purchase price.
What type of flour is cheapest for feeding a sourdough starter?
Unbleached all-purpose flour is the most affordable option and works perfectly for daily maintenance, typically $0.70–$1.20 per pound. Whole wheat and rye flour cost $1.50–$3.00 per pound but accelerate fermentation because the bran contains more wild yeast and bacteria. Many bakers use cheap all-purpose for 90% of feedings and add a small percentage of whole wheat or rye once a week to keep the culture vigorous without dramatically increasing costs.
Can I reduce starter costs by keeping it in the refrigerator?
Yes — refrigerating your starter between bakes is the single biggest cost-cutting move available to you. A cold starter can go 7–14 days between feedings without significant harm to the culture. If you bake sourdough once a week, you can pull the starter out 24 hours before baking, feed it, use the active portion, and return the rest to the fridge. This drops your feeding frequency from 7x to 1x per week, cutting flour costs by up to 85% compared to daily counter-top feeding.