Enter the number of guests and your preferred serving size to find out exactly how much mashed potatoes you need. The How Much Mashed Potatoes per Person calculator returns the total weight in pounds and ounces, plus the equivalent in cups — so you never run short at the dinner table.
Total Mashed Potatoes Needed
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Total Weight (oz)
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Total Volume (cups)
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Raw Potatoes to Buy
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Serving Size per Person
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A standard side-dish serving is about half a pound (8 oz) of raw potatoes per person, which yields roughly 6 oz (¾ cup) of finished mashed potatoes. For a holiday feast where mashed potatoes are the star, bump that up to about 10 oz of finished mash per person.
For 10 people with a standard serving (6 oz each), you need about 3.75 lbs of finished mashed potatoes. To account for that, buy roughly 5–6 lbs of raw potatoes, since potatoes lose about 25–30% of their weight during peeling and cooking.
Plan to buy about 1.25–1.35 lbs of raw potatoes for every 1 lb of finished mashed potatoes. Peeling, cooking, and moisture loss reduce the weight, so always buy more than you think you need.
Russet potatoes are the classic choice — they're high in starch and yield a fluffy, light mash. Yukon Golds are another excellent option; their naturally buttery flavor and slightly waxy texture produce a creamier result. Avoid waxy varieties like red potatoes for mashing.
If your mash is too thin, return it to low heat and stir continuously to evaporate excess moisture. You can also mix in a tablespoon of instant potato flakes, a small amount of cream cheese, or simply more mashed potato to absorb the liquid.
Store leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, add a splash of milk or cream, then warm gently on the stovetop over low heat or in the microwave in 1-minute bursts, stirring between each. Mashed potatoes can also be frozen for up to 6 months — portion them into freezer bags for easy use.
Yes. Substitute milk with chicken or vegetable broth for a savory flavor, or use non-dairy alternatives like oat milk or unsweetened almond milk. Sour cream, cream cheese, or extra butter are also great additions that eliminate the need for milk entirely.
Absolutely. For Thanksgiving or Christmas, mashed potatoes tend to disappear fast and guests often go back for seconds. Adding a 20–25% buffer is a smart move — leftover mashed potatoes reheat well and can be used in other dishes like potato cakes or shepherd's pie.