Thanksgiving mashed potatoes need half a pound of potatoes per person

Plan on half a pound of raw potatoes for every guest and your Thanksgiving mashed potatoes will come out right, with a spoonful or two left for Friday. That's 227 grams a head, which works out to roughly one medium russet per person.

Most cooks get this wrong by counting potatoes instead of weighing them. A large russet can weigh nearly twice what a medium one does, so "one per person" can mean 6 pounds or 10 pounds for the same 12 people. Weight is the only number that stays put.

How many pounds of potatoes per person for mashed potatoes

The A Food Lover's Kitchen guide starts every crowd at 8 ounces of raw potato per person. The Takeout lands in the same spot, suggesting a third to half a pound and the low end when the table is already loaded with sides.

Rule of thumb: 1/2 pound (227 g) of raw potatoes per guest. Drop to 1/3 pound (151 g) on a crowded holiday table, or climb to 3/4 pound (340 g) if you want real leftovers.

Scaling up when sides crowd the table

Thanksgiving is the one meal where the lower number usually wins. Stuffing, sweet potatoes, rolls and green beans all compete for the same plate space, so people take smaller scoops. If your family treats the mash as the main event, though, The Takeout says to go up to two thirds or three quarters of a pound each.

How many potatoes in a pound, by size

USDA reference weights quoted by Live Eat Learn put a large russet at 13 ounces, a medium at 7.5 ounces and a small at 6 ounces. That's why a pound holds about two medium russets but only one large one with a bit to spare.

Sweet potatoes run smaller than you'd guess

If you're wondering how many sweet potatoes in a pound, the USDA figures give about two large ones at 8 ounces each or three medium ones at 5 ounces. Small sweet potatoes weigh around 3 ounces, so you'd need five or six of them to reach a pound.

Bags make this easier. A 5 pound bag of russets usually holds 10 to 12 potatoes and a 10 pound bag holds 20 to 24, so one 10 pound bag covers 20 guests at the standard half pound. Need the metric side? Our pounds to grams chart has every size.

A guest chart for Thanksgiving mashed potatoes

Here's the half pound rule laid out by headcount, priced at the September 2026 national average of $0.989 a pound for white potatoes from the BLS price series on FRED. Your store will differ a little, but the shape holds.

That answers how many mashed potatoes per person you should actually make. Pair the chart with our turkey per person guide and you've sized the two biggest dishes on the table.

A 10 pound bag of russets feeds 20 people at half a pound each, and at the 2026 average price it costs less than $10.

What the extra pound actually costs you

Potatoes are the cheapest insurance on the menu. Going from half a pound to three quarters of a pound for 12 guests adds 3 pounds, or about $2.97 at the national average. For 20 people the jump is 5 pounds and roughly $4.95.

The real cost isn't the spuds, it's the butter and cream that scale with them. Most recipes add dairy per pound of potatoes, so a bigger batch quietly raises your butter bill too. Check our stick of butter guide before you shop so you buy the right number of boxes.

Picking the best mashed potatoes for Thanksgiving

Russets give a fluffy, airy mash and Yukon Golds give a denser, creamier one. Because Yukons are smaller at 3 to 4 ounces each, you'll need four or five of them per pound, so weigh them rather than counting. The video below cooks red, Yukon and russet side by side if you can't decide.

Whichever you pick, the half pound target doesn't change. It's the one constant across nearly all potato recipes for Thanksgiving, from smashed reds to loaded casseroles.

Weighing beats counting spuds at the store

Grocery bags are labeled by weight for a reason. Put your loose potatoes on the produce scale until it hits your target, or use a kitchen scale at home and switch units with our grams to ounces converter. Either way you'll stop guessing.

Weigh them before you peel

Both guides quote raw potato weight, the number you pay for at the register. So weigh whole, unpeeled potatoes when you shop and skip any math about what peeling removes.

Weigh raw, unpeeled potatoes before you cook. Every per person guideline here assumes the weight you pay for at the store, not the weight left after peeling.

Mashed potato questions people actually ask

How many potatoes for mashed potatoes per person?

About one medium russet per guest, since a medium weighs 7.5 ounces and the target is 8. If your potatoes are large, six of them cover four people, which is the count The Takeout uses.

How much mashed potatoes per person once it's cooked?

Expect roughly three quarters of a cup to one cup of finished mash per guest. That's what half a pound of raw potatoes turns into after butter and milk go in.

How much does a potato weigh on average?

A medium russet averages 7.5 ounces, or 213 grams, by USDA reference figures. Small ones sit around 6 ounces (170 g) and large ones around 13 ounces (369 g).

How long can mashed potatoes sit on the buffet?

Keep them at 140°F or above if they'll sit out for a while. A slow cooker on the warm setting does the job and frees up a burner for gravy.

Need to weigh potatoes fast without hauling out a scale? Download Scale for Grams and get an AI-powered weight estimate from a photo in seconds, perfect for checking you've got half a pound per guest. Get the app here: iOS.