Produce
Mashed Potato Conversion
Mashed Potato weighs 210g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 210.0 g | 7.41 oz |
| 1/2 cup | 105.0 g | 3.70 oz |
| 1/4 cup | 52.5 g | 1.85 oz |
| 1 tbsp | 13.1 g | 0.46 oz |
| 1 tsp | 4.4 g | 0.15 oz |
| 100 g | 100.0 g | 3.53 oz |
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Mashed potato weighs 210 grams per cup, and this figure reflects a standard mash made with some added milk, cream, or butter — since "mashed potato" isn't a fixed-composition food the way flour or sugar is, the exact weight can shift somewhat depending on how much liquid and fat was worked in and how thoroughly the potatoes were mashed.
That variability is worth knowing about specifically because it makes mashed potato one of the less precise cup-conversion entries on this site — useful as a general planning reference (how much a batch will yield, or scaling a casserole recipe that calls for mashed potato by the cup) rather than as a precise baking-grade density figure the way a raw, unmixed ingredient's density can be.
Potato's starch content is what allows mashed potato to hold together at all rather than remaining a loose, separate mass of cooked potato pieces — over-mashing (particularly with a food processor, which shreds the starch granules too aggressively) releases too much of that starch and produces a gluey, gummy texture, which is why many cooks specifically use a ricer or hand masher rather than a processor for a smooth-but-not-gluey result.
Shepherd's pie relies on a layer of mashed potato baked over a meat filling until lightly browned on top, a classic use that takes advantage of the dish's ability to hold its shape when baked.
Adding roasted garlic, sour cream, or a browned-butter finish are all popular ways to build extra flavor into mashed potato beyond the standard milk-and-butter base, each giving a genuinely different final character to the same starting dish.
A potato ricer, which forces cooked potato through small holes under pressure, gives an especially smooth, lump-free result without the risk of over-mashing that a food processor carries, making it a favorite tool among cooks chasing a silky texture.
How long does it last?
Storage & shelf life →
Frequently asked questions
Why does the weight of mashed potato vary between recipes?
Because mashed potato isn't a fixed-composition ingredient — how much milk, cream, or butter is worked in, and how finely the potato is mashed, both genuinely change its density, unlike a raw ingredient with one consistent, sourced figure.
Why does mashed potato sometimes turn gluey or gummy?
Over-working the potato, especially with a food processor or overly vigorous mixing, ruptures too many starch granules and releases excess starch into the mixture, producing a gluey texture — a ricer or hand masher applies gentler, less starch-releasing pressure.
How many potatoes make about 1 cup of mashed potato?
Roughly one large potato yields about 1 cup of mashed potato once cooked and mashed, though this varies with potato size and how much added milk or butter is worked in.
Does the type of potato used change how much a cup of mashed potato weighs?
Not dramatically — a starchier potato like a russet mashes lighter and fluffier, while a waxier potato like a Yukon Gold mashes denser and creamier, but the practical weight difference per cup is modest for most recipe purposes.
Can leftover mashed potato be frozen?
Yes, and it holds up reasonably well — the texture can turn slightly grainy on reheating, but stirring it through (especially with a splash of added milk or butter) generally smooths it back out well enough for most uses.