The weight of a potato may seem quite straightforward, but different varieties, allowed to grow to different sizes depending on their intended use, don’t all weigh the same amount.
This can make it hard to judge how many potatoes are in a particular bag.
Knowing how much different potatoes weigh can help you estimate how many are in any bag or how many bags you need for a recipe.
Potato Type Weights
There are many different potato varieties, and each variety can weigh more or less than the next.
Russet potatoes are very common, and they generally weigh around 5.3 ounces, although they can grow to as large as 10 ounces.
Yellow potatoes are a bit larger, and they usually weigh between 8 and 12 ounces.
Red potatoes, meanwhile, tend to be much smaller.
They usually weigh about 6 ounces, at most, and some can weigh as little as 1 ounce.
Yukon gold potatoes, another common variety, weigh about the same as a russet.
Their average weight is 5.2 ounces.
Potato Weights Based on Size
Potatoes don’t all grow to the same size.
A small russet, yellow, or another common potato generally weighs around 3.5 ounces.
A medium potato, of a common variety, usually weighs around 5.5 ounces.
A large potato will usually weigh around 10 ounces, although some can weigh a bit more.
This, of course, does vary from type to type.
Small red potatoes will weigh significantly less than small yellow potatoes.
How many potatoes are in 2 pounds?
Figuring out exactly how many potatoes are in 2 pounds can be tricky since each potato will vary a bit in weight, even if they’re all the same type and roughly the same size.
However, using the average weight of any potato type can get you an answer that’s a very close estimate.
There are 16 ounces to 1 pound. If your 2-pound bag of potatoes is made up of russet potatoes, we know that the average weight of each potato is about 5.3 ounces. Sixteen divided by 5.3 is just slightly over 3, which tells us that there are about three average-sized russet potatoes in a pound.
Doubling this number tells us that there are about six russet potatoes in 2 pounds.
Some potatoes will, of course, be larger or smaller, but because you’ve used an average weight, your number should be quite close to what’s actually in the bag.
To find out how many yellow potatoes are in 2 pounds, we first need to find the average weight.
To find an average, take the lowest and highest weights, which are 8 and 12 ounces, add them together, and divide by 2. The answer is 10. We can divide 16 by 10 and then multiply the answer by 2 to find that there are about three yellow potatoes in 2 pounds.
Using the same math, we can tell that there are also about nine red potatoes or six Yukon gold potatoes in 2 pounds.
Weighing a Potato Without a Scale
Even if you don’t have a scale handy, you can still estimate the weight of a potato.
Medium potatoes, weighing around 5 ounces, are just about as heavy as a baseball.
Most large potatoes, weighing around 10 ounces, are almost the same weight as a grapefruit.
If you’re in the grocery store and want to pick bigger potatoes, use a grapefruit to compare.
Smaller potatoes, weighing between 3 and 3.5 ounces, are about the same weight as a banana or a stick of butter.
You can also estimate weight by looking at how big the potato is.
Potatoes are almost always graded and sold in three sizes.
Large potatoes are called A potatoes, and they must have a diameter of at least 2.5 inches.
These are the potatoes that weigh close to or, sometimes, even more than 10 ounces.
B potatoes are between 1.5 and 2.25 inches in diameter and generally weigh somewhere around 5 ounces.
The smallest potatoes are C potatoes, which have a diameter of 1.5 inches or less and weigh around 3.5 ounces.
How many potatoes are there in a 5-pound bag?
To figure out how many potatoes of any given type are in a 5-pound bag, we will again need to take the average weight of the potato type and figure out how many times that goes into 16.
Then, instead of multiplying by 2, we need to multiply by 5.
This formula tells us that there are about 15 russet potatoes in a 5-pound bag. It also tells us that a 5-pound bag will contain about eight yellow potatoes, 22.5 red potatoes, or about 15 Yukon gold potatoes.
How many potatoes are there in a 10-pound bag?
We can use the same formula as above, substituting 10 for 5, to figure out how many of any type of potato is in a 10-pound bag.
There will be about 30 russet potatoes, 16 yellow potatoes, 46 red potatoes, and 31 Yukon gold potatoes per bag.