Simmering wine for 15 minutes removes only about 60% of the alcohol, and even after two and a half hours of steady cooking, roughly 5% of the original alcohol remains. Complete removal through simmering alone is essentially impossible in a home kitchen. The alcohol content drops quickly at first, then tapers off, so the practical question is how low you need to go and how long you’re willing to wait.
Alcohol Retention by Cooking Time
The USDA maintains a nutrient retention table that tracks how much ethanol stays in a dish when it’s stirred and simmered at a steady temperature. These are the benchmarks most food scientists rely on:
- 15 minutes: 40% of the original alcohol remains
- 30 minutes: 35% remains
- 1 hour: 25% remains
- 2 hours: 10% remains
- 2.5 hours: 5% remains
A standard glass of wine contains about 14% alcohol by volume. If you pour one cup into a sauce and simmer it for an hour, the liquid still holds roughly a quarter of that alcohol. That’s a small absolute amount, but it isn’t zero. For stews and braises that cook for two and a half hours or more, you’re looking at the lowest practical level, around 5%, but that floor is stubborn.
Why the Alcohol Never Fully Disappears
Ethanol boils at about 173°F (78°C), well below water’s 212°F (100°C). This leads to the common belief that alcohol simply “boils off” once a pot gets hot enough. In reality, ethanol and water form a mixture that doesn’t behave like either liquid on its own. The two evaporate together, and as the ethanol concentration drops, the remaining molecules become harder to drive out of the solution. Think of it like wringing out a towel: the first twist removes a lot of water, but the last bits cling stubbornly to the fabric.
This is why the curve flattens so dramatically. You lose 60% of the alcohol in the first 15 minutes but need another two hours just to chip away at most of what’s left.
Factors That Speed Up or Slow Down Evaporation
The USDA numbers assume a stirred, uncovered liquid at simmering temperature. Change any of those conditions and your results shift.
Surface area matters most. A wide, shallow skillet exposes far more liquid to the air than a tall, narrow saucepan. More surface area means more evaporation. If you’re making a pan sauce in a 12-inch skillet, alcohol will leave faster than the same sauce reduced in a small pot. Spreading the liquid thin is the single most effective way to accelerate the process.
Keeping the lid off is essential. A covered pot traps alcohol vapor above the liquid, which slows evaporation considerably. If you need to simmer a stew with the lid on for texture reasons, expect significantly higher alcohol retention than the numbers above suggest. Cracking the lid helps, but removing it entirely is better for alcohol reduction.
Stirring helps. The USDA retention data is based on stirred liquids. Stirring brings alcohol-rich liquid from the bottom to the surface, where it can evaporate. A sauce left undisturbed will lose alcohol more slowly.
Temperature plays a role too. A gentle simmer removes alcohol more slowly than a vigorous one. If your goal is maximum alcohol reduction in minimum time, a rolling simmer (not a full boil, which can ruin a sauce) in a wide uncovered pan with regular stirring is your best approach.
Flambéing Is Less Effective Than You’d Think
Lighting alcohol on fire looks dramatic, but the flames do surprisingly little. In lab tests using vodka, igniting the liquid only removed about 25% of the ethanol. Interestingly, simply heating the same vodka without lighting it actually removed more, around 35%. The reason: the flame burns off vapor above the surface but doesn’t pull much alcohol out of the liquid itself. In a thicker preparation like a caramel sauce made with butter and sugar, the difference between ignited and non-ignited was negligible, with both methods removing only about 13-14% of the alcohol. The takeaway: flambéing is for show, not for sobriety.
What This Means in Practical Terms
For most cooking purposes, the residual alcohol after a long simmer is tiny in absolute terms. A cup of wine at 14% ABV, simmered for two hours in a sauce that serves six people, leaves each portion with a fraction of a gram of alcohol. That’s less than what occurs naturally in ripe fruit or a glass of orange juice. For the vast majority of people, this is nutritionally and physiologically irrelevant.
However, for people in recovery from alcohol use disorder, even trace amounts can be a concern, and the concern may be psychological as much as chemical. The taste and aroma of wine persist in cooked food long after most of the alcohol has evaporated, because the flavor compounds responsible for those qualities are not ethanol itself. If you’re cooking for someone who needs to avoid alcohol entirely, substituting with stock, juice, or vinegar is more reliable than relying on long cook times. No amount of simmering will get a dish to truly alcohol-free, which the FDA defines as containing no detectable alcohol at all.
For everyone else, the practical rule is simple: the longer and more vigorously you simmer in an uncovered, wide pan, the less alcohol remains. Two to two and a half hours gets you down to the 5-10% range. For a quick pan sauce that only cooks for a few minutes, expect most of the alcohol to still be there.