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Sourdough Starter Feeding Ratio Chart: The One You'll Actually Use

The ratio you feed your starter is the single biggest lever you control — and most bakers get it wrong by defaulting to 1:1:1 no matter what. A 1:1:1 feed (1 part starter, 1 part flour, 1 part water) works fine at 75°F when you're baking every day. Change any one of those conditions and you need a different ratio. This chart gives you the right numbers for the right situation, plus the timing trick my grandmother used for 40 years that I've never seen written down anywhere.

What Feeding Ratios Actually Mean (And Why They Matter)

A feeding ratio like 1:2:5 means 1 part starter, 2 parts flour, 5 parts water — by weight, always by weight. The first number is your starter. The second is flour. The third is water. Simple.

What changes is how much food you're giving your culture relative to the wild yeast and bacteria already living in it. A 1:1:1 feed gives your starter a small meal it finishes fast. A 1:5:5 feed is a banquet — the organisms eat more slowly and the whole timeline stretches out. Temperature affects this too, dramatically.

I've killed three starters by refusing to adjust ratios when my kitchen got cold in November. The culture didn't die from neglect exactly — it died from being overfed on a schedule that made sense in July but was completely wrong at 62°F. Ratio and timing are inseparable.

The Feeding Ratio Chart (Save This)

These times assume a moderately active starter — one that's been maintained for at least two weeks. A brand-new starter will run slower. A heritage culture like The Mother will often run faster.

• 1:1:1 — Room temp 74–78°F. Peak in 4–6 hours. Use when baking daily or every other day.
• 1:2:2 — Room temp 70–74°F. Peak in 6–8 hours. Good for a morning feed, evening bake schedule.
• 1:3:3 — Room temp 68–72°F. Peak in 8–10 hours. Overnight counter feed in a slightly cool kitchen.
• 1:4:4 — Room temp 65–68°F. Peak in 10–14 hours. Late autumn kitchen, no heat running at night.
• 1:5:5 — Room temp 62–65°F. Peak in 14–18 hours. Cold kitchen in winter, or a very slow starter that needs a gentler pace.
• 1:1:1 (refrigerator maintenance) — Fridge at 38–40°F. Feed once a week, pull out 2 hours before you need it active.

The pattern is deliberate. Every few degrees of temperature drop, you bump the ratio up one step. You're giving the organisms more food so they don't exhaust the supply before you're ready to bake. If you want to calculate the exact grams for your jar size, our sourdough starter feeding calculator does the math instantly.

Grandma's Timing Trick: The Float-and-Wait Method

My grandmother, Marta, kept a starter for decades in rural Wisconsin. She never owned a thermometer. She did something I watched for years without fully understanding it — she dropped a small spoonful of starter into a glass of room-temperature water before every feed.

If it floated, she fed at 1:1:1. If it sank but rose within 30 seconds, she fed at 1:2:2. If it sank and stayed down, she fed at 1:3:3 or higher. She was reading two things at once: activity level and how spent the culture was. A starter that floats immediately still has active gas production — it doesn't need a heavy feed. A starter that sinks fast is depleted, tired, and needs more food relative to its size.

This isn't a perfect science. But after 15 years I still use it as a gut-check alongside my thermometer, and it rarely steers me wrong. The float test is most reliable at peak — so if you're testing a cold starter straight from the fridge, give it 1 hour at room temperature first.

When to Use a High Ratio vs. a Low Ratio

Low ratios (1:1:1, 1:2:2) are for active bakers in warm kitchens. You're feeding frequently, the culture is vigorous, and you want fast turnaround. This is summer baking. This is the week before a big bake when you're building strength.

High ratios (1:4:4, 1:5:5) are for maintenance, slow schedules, and cold environments. You're not baking tomorrow. You want the starter to coast. You're keeping it alive without running it ragged.

There's a middle situation people forget about — the "stiff starter" feed. Some bakers run a 1:2:1 ratio (less water than flour) to create a stiffer dough-like culture. This ferments more slowly and produces a milder, less acidic flavor. I use this in July when my kitchen hits 80°F and my bread starts tasting too sour. Stiff starters are more forgiving in heat. Worth knowing.

How Temperature Changes Everything

At 78°F, a 1:1:1 starter peaks in about 4 hours. At 65°F, that same 1:1:1 starter might not peak for 10 hours — and it'll be overripe and collapsing by morning. This is the mistake that frustrates most bakers. They blame the starter. The starter is fine. The math is wrong.

Every 17°F drop in temperature roughly doubles fermentation time. That's not exact — it's a rule of thumb — but it's close enough to plan around. So if your kitchen is 65°F and you want to bake in 8 hours, don't feed 1:1:1. Feed 1:2:2 or even 1:3:3.

I keep a stick-on thermometer on the side of my starter jar. Not the ambient room temperature — the actual temperature of the culture. They can be 3–5°F different. That gap matters more than most bakers realize, especially in winter when the jar sits on a cold counter.

Signs Your Ratio Is Off (And How to Fix It)

Your starter is telling you when the ratio is wrong. You just have to know the language. If it peaks too early — domed top, then collapses before you're ready — your ratio is too low for your temperature. Go up one step.

If it's sluggish, barely doubling, and smells more like alcohol than bread — it's been underfed or overfed on too loose a schedule. Pull out all but 20g, feed 1:5:5, and give it 12 hours at 70°F before you judge it again. One cycle often fixes it.

If it smells like nail polish remover (ethanol) or has a thin liquid layer on top (called hooch), the culture is starving. That liquid layer isn't mold — it's just alcohol produced by stressed yeast. Stir it in or pour it off, feed at a higher ratio than usual, and don't panic. For more specific problems, the sourdough starter troubleshooter walks through every scenario with fixes.

Building a Feeding Schedule Around Your Life

Most bakers want to bake on weekends. That means you need an active starter Friday night or Saturday morning. Work backward from there.

Thursday night: pull starter from fridge, feed 1:2:2 at room temperature. Friday morning: starter is active, feed 1:1:1. Friday evening: starter is at peak — use it or feed 1:3:3 to push peak to Saturday morning. Saturday: bake.

This schedule works at 70–72°F. Adjust the ratios up if your kitchen is cooler. The principle is the same — you're stair-stepping activity back up from refrigerator dormancy to full peak strength in about 48 hours. Two feeds is usually enough. Three feeds if the culture has been in the fridge for more than two weeks.

Frequently Asked Questions

Can I feed my starter a 1:10:10 ratio to skip a day of feeding?

Yes, and it works well. At 70°F, a 1:10:10 feed can stay at peak for 18–24 hours, giving you a wide window. At room temperature this is fine for a day or two. Beyond that, refrigerate it — even a large ratio feed will eventually exhaust itself and start producing too much acid. I use 1:10:10 when I'm traveling for a weekend and want to leave the starter on the counter without worrying.

Does the type of flour change the ratio I should use?

It changes the timing more than the ratio itself. Whole wheat and rye flours ferment faster than white flour — sometimes 30–40% faster — because they carry more wild yeast and enzymes naturally present in the bran. If you switch to a whole grain feed, expect your starter to peak an hour or two earlier than usual at the same ratio. You might drop one ratio step down (say from 1:3:3 to 1:2:2) to keep the timing where you want it.

My starter doubles but doesn't pass the float test. Which should I trust?

Trust the doubling over the float test, every time. The float test is a rough indicator — it depends on the hydration of your starter, the temperature of the water, and how gassy the culture is at that exact moment. Some perfectly healthy starters at 75% hydration never float reliably. If your starter doubles in a predictable window and smells clean and yeasty, it's ready to bake with. The float test is useful for beginners reading activity levels — it's not a pass/fail standard.

How do I know when I've found the right ratio for my kitchen?

You've found it when your starter peaks reliably within 1 hour of the same time two feeds in a row. Write down your ratio, your water temperature (I use 75°F filtered water year-round), your room temperature, and the time to peak. After three consistent feeds, you have your baseline. Adjust by one step up or down as seasons change — that's it. Most bakers

Smelling something sharp? If your starter smells like acetone or nail polish, that’s a specific (and fixable) signal — here’s exactly what it means and the one fix.