1/2 Cup Peanuts in Grams
1/2 cup of peanuts weighs 71 g (spooned and levelled, King Arthur Baking). Shelled whole peanuts. All the figures on this page are approximate conversions based on the King Arthur Baking value, so when a recipe really matters, verify with a kitchen scale. Peanuts are the nut that feeds a crowd: cheap, filling and endlessly useful, from a satay sauce to a brittle, a salad to a trail mix, and a half cup is the amount a single recipe usually needs, which makes this conversion one of the most reached-for in the series.
Why half a cup of peanuts is a useful amount
Half a cup of peanuts is the amount that shows up in a batch of cookies, a tray of granola or a handful of trail mix, and it is also the amount where the cup starts to mislead you. Whole and chopped nuts do not pack the same way twice: the gaps between the pieces change with the size of the chop, the shape of the nut and how settled the bag is. A level half cup of chopped peanuts can weigh several grams more or less than the same volume of whole ones, and that swing matters when nuts are the expensive ingredient in the recipe. Snacking, stir-fries, sauces and baking. The table below is built from the published King Arthur Baking weight for peanuts measured spooned and levelled, so you can weigh a batch once and repeat it exactly.
Peanuts cups to grams conversion table
| Cups | Grams | Tablespoons (approx.) |
|---|---|---|
| 1/4 cup | 35.5 g | 2.2 g |
| 1/3 cup | 47.3 g | 3 g |
| 1/2 cup | 71 g | 4.4 g |
| 2/3 cup | 94.7 g | 5.9 g |
| 3/4 cup | 106.5 g | 6.7 g |
| 1 cup | 142 g | 8.9 g |
| 1 1/2 cups | 213 g | 13.3 g |
| 2 cups | 284 g | 17.8 g |
| 3 cups | 426 g | 26.6 g |
| 4 cups | 568 g | 35.5 g |
The tablespoon column is a bonus for recipes that call for a spoonful or two: one tablespoon of peanuts weighs about 8.9 g, and one teaspoon about 3 g. A cup is 16 tablespoons, so the numbers in the table are just the cup weight divided by 16, rounded to one decimal place. For small amounts a scale that reads to the gram is far more reliable than a spoon, because a heaped tablespoon can weigh half as much again as a level one.
How the weight was measured
Spooned and levelled means spooning the ingredient into the measuring cup until it is heaped, then sweeping a straight knife across the top to level it off. Never scoop the cup through the bag or jar, and never tap the cup down, because both pack the ingredient and add weight.
The source for the 142 g figure is King Arthur Baking, and the confidence in the value is high. King Arthur Baking publishes a standard ingredient weight chart that recipe developers use as a reference, and this page follows it exactly rather than averaging across sources, because an average of two different measuring methods is a number that matches nobody's cup.
Worked examples
A peanut brittle for a gift batch
A peanut brittle for gifts calls for 1/2 cup of roasted peanuts, which is 71 g, stirred into hot sugar syrup just before it sets. The peanuts have to be weighed before they go in, because the syrup sets in seconds and there is no time to measure twice. Weighing 71 g keeps the brittle crunchy without being mostly sugar, and the peanuts should be warm, or they cool the syrup too fast.
A trail mix for a hiking trip
A trail mix for a weekend hike uses 1/2 cup of peanuts, which is 71 g, mixed with raisins, chocolate chips and pretzels. The peanuts are the protein in the mix, so their weight decides whether the mix is filling or just sweet. Weighing 71 g keeps the mix balanced, and the mix should be portioned into bags before the hike, or the peanuts all sink to the bottom.
A peanut sauce for noodles
A peanut sauce for a noodle dinner calls for 1/2 cup of crushed peanuts, which is 71 g, sprinkled over the finished bowls. The peanuts are the crunch on top of a soft noodle dish, so their weight decides whether every bowl gets some. Weighing 71 g keeps the topping even, and the peanuts should be crushed just before serving, or they soften in the sauce.
When this conversion matters most
This conversion matters most when nuts are the expensive ingredient or the structural one. In a cookie, the weight of peanuts decides whether the dough holds together or crumbles; in granola, it decides the ratio of crunch to oats; in a cake, it decides whether the crumb is studded or overloaded. A cup measure hides all of that behind the air gaps between the pieces, so two bakers following the same recipe with cups can end up with visibly different results. Weighing removes the guesswork and, just as usefully, tells you exactly how much of an expensive ingredient a recipe really needs.
Common mistakes with peanuts
- Mixing whole and chopped weights. Chopped nuts pack tighter than whole ones, so a half cup of chopped peanuts weighs more than a half cup of whole. Use the weight for the form the recipe actually calls for, and chop after weighing when you can.
- Scooping from the bag. Scooping compresses the pieces and traps fewer air gaps, so the cup holds more than a spooned, levelled measure. Spoon the nuts in and level them off.
- Skipping the scale for an expensive ingredient. Nuts are the priciest item in most baking. Weighing tells you the true cost of a batch and stops you pouring in a generous extra handful that the recipe never asked for.
- Storing nuts where they go stale. Nuts go rancid in a warm cupboard, and stale nuts weigh the same but taste of nothing. Keep them sealed and cool so the weight you measure is the flavour you expect.
Storage and handling
Airtight container, cool and dry, up to 3 months. Keeping peanuts stored properly also keeps its weight per cup stable: an ingredient that has absorbed moisture from the air weighs more per cup than a dry one, so a sealed container is not just about freshness, it is about measurement accuracy too. If a bag has been open for months in a humid kitchen, the first thing to do before a precise bake is to weigh the ingredient rather than trusting the cup.
Frequently asked questions
How many grams is 1/2 cup of peanuts?
1/2 cup of peanuts weighs 71 g, measured spooned and levelled according to King Arthur Baking. That is the figure to use when converting a recipe from cups to grams, and it is the value the conversion table on this page is built on.
How do I measure peanuts without a scale?
Spooned and levelled means spooning the ingredient into the measuring cup until it is heaped, then sweeping a straight knife across the top to level it off. Never scoop the cup through the bag or jar, and never tap the cup down, because both pack the ingredient and add weight. That gives the closest result to 71 g per half cup, but it is still an estimate: the honest answer is that a scale is the only way to know the exact weight, and a basic digital kitchen scale costs less than a bag of good flour.
Does peanuts always weigh the same per cup?
No. Brand, grind, moisture and how settled the container is all shift the weight by a few grams, and for some ingredients the swing can be much larger. The 142 g figure is the standard King Arthur Baking value for peanuts measured spooned and levelled, and it is the right default, but when a recipe is precise, weigh the ingredient and trust the scale over the cup.
Can I use the same conversion for a different brand of peanuts?
Yes, as a starting point. The 142 g figure is a standard average for peanuts, and most brands sit within a few grams of it. If you cook with one brand all the time, weigh one cup of it once and note the number on the bag, and you will have a conversion tuned to your own kitchen.
Are peanuts and peanut butter interchangeable by weight?
No. A half cup of whole peanuts is 71 g, while a half cup of peanut butter is 135 g, and the two behave completely differently: whole peanuts add crunch, peanut butter adds creaminess and binds a dough or a sauce. You cannot swap them cup for cup or gram for gram in a recipe that depends on texture. Use peanuts where the recipe wants crunch, and peanut butter where it wants binding.
How should I store peanuts?
Airtight container, cool and dry, up to 3 months. Good storage keeps the ingredient fresh and keeps its weight per cup consistent, because moisture absorbed from the air adds grams that the recipe did not ask for.
Related conversions
Use the cups to grams converter, tablespoons to grams converter, weight converter, recipe scaler for instant answers, or browse the cups to grams hub for the full ingredient list. Related pages: Peanut Butter in cups to grams, Rolled Oats in cups to grams, Cocoa Powder in cups to grams. See also our disclaimer about approximate conversions.