Dairy & Eggs
Whole Milk
Whole milk's 240g-per-cup figure is close enough to water's own weight (roughly 236g per cup) that it's a useful reference point for other liquid dairy conversions on this site — cream, half-and-half, and buttermilk all sit in a similar range, with small variations driven mainly by fat content.
This hub page connects milk's conversion figure to its real fridge and freezer life — 5-7 days after opening in the fridge, up to 3 months frozen, though frozen and thawed milk separates and is best reserved for cooking or baking rather than drinking, since the smooth, uniform texture fresh milk has doesn't fully return after freezing.
Milk's spoilage signs are some of the more universally recognized on this site — a sour smell, curdled texture, and yellowing are all clear discard signals, though it's worth noting that milk substitutes for baking (buttermilk-style acidified milk, for instance) intentionally curdle milk on purpose, a useful distinction between deliberate curdling and actual spoilage.
Whole, 2%, 1%, and skim milk all come from the same starting product, differing only in how much fat has been removed during processing — a distinction that affects far more than calorie count, since fat contributes meaningfully to both flavor richness and, in baking, tenderness and moisture in the finished product.
Steaming milk for a latte or cappuccino depends on that same fat content — whole milk froths into a denser, creamier microfoam than skim, which is part of why baristas often reach for whole or 2% rather than skim when texture matters as much as taste.
Ultra-pasteurized (UHT) milk, treated at a higher temperature than standard pasteurization, has a longer unopened shelf life but a slightly different, sometimes described as "cooked," flavor compared to conventionally pasteurized milk — a genuine trade-off between shelf stability and the fresher taste some drinkers and bakers prefer.
Frequently asked questions
How long does milk actually last after opening?
About 5-7 days in the fridge after opening, though this can vary somewhat by how consistently your fridge holds temperature — checking for the listed spoilage signs (sour smell, curdling, yellowing) is more reliable than relying on the date alone as it approaches.
Can I still drink milk after it's been frozen and thawed?
Technically yes if it hasn't spoiled, but the texture separates on thawing in a way most people find unpleasant for drinking — frozen and thawed milk is much better suited to cooking or baking than to drinking straight.
Is curdled milk always a sign of spoilage?
Not always — some recipes intentionally curdle milk on purpose (mixing in an acid like lemon juice to make a buttermilk substitute) — but curdling that happens on its own, without an added acid, in milk you intended to drink or use fresh, is a genuine spoilage sign.
Does this hub page's conversion figure apply to 2% or skim milk too?
Yes, closely enough for practical purposes — the fat content difference between whole, 2%, and skim milk doesn't meaningfully change the weight per cup, since milk's overall composition is still dominated by water regardless of fat percentage.
Is plant-based milk covered by this same page?
No — oat, almond, soy, and other plant-based milks have their own distinct compositions and aren't included in this site's bounded, dairy-focused density dataset; treat this page's figures as specific to dairy milk.
Why doesn't milk have its own substitutes page on this site?
Milk substitution is broad enough (plant-based milks, evaporated milk, powdered milk reconstituted) that it didn't fit this site's bounded, ratio-specific substitute format as cleanly as an ingredient with one or two clear, well-tested substitutes does.