Walnut Weights & Calories (Including Calculator & Charts)

Use this page to help you to calculate the weights and calories of any serving size or portion of walnuts.

The easy-to-use calculator and charts below will help you to calculate both cooking weight conversions and calorie amounts depending on what you need.

How Much Does a Whole Walnut Weigh?

I weighed a number of whole walnuts with the shell and I got the following average weight:

The average weight of a whole walnut is 11g (0.4oz) including the shell.

Use the table below for more conversions:

ConversionWeight of One Average
Walnut
(with Shell)
Grams11g
Ounces0.4oz
Kilograms0.011kg
Pounds0.02lb
whole walnut on a scale to show it weighs around 11g

How Much Does a Walnut Half Weigh?

There are two half kernels in a walnut shell and this is generally how shelled walnuts are sold.

I weighed a number of half walnut kernels and found the following average weight:

The average weight of one-half walnut kernel is 2.4g (0.08oz).

ConversionWeight of One Average
Walnut
half (no shell)
Grams2.4g
Ounces0.08oz
Kilograms0.0024kg
Pounds0.005lb

Walnut Calculator

The calculator below will help you to quickly calculate the weight and calories of your portion of walnuts.

This calculator is based on an average unshelled half walnut weight of 2.4g (0.08oz) per kernel.

I have also used the assumption that the average walnut is equal to 16kcal (as per USDA).

How Much Does a Cup of walnuts Weigh

I weighed a cup full of average-sized walnut halves and found the following:

A full US cup of walnut halves weighs 100g (3.5oz) and contains around 41 individual walnut halves in total.

Half a US cup of walnuts weighs around 50g (1.8oz) and contains around 20 individual walnut halves in total.

weight of a cup of half walnuts to show a cup weighs 100g

How Many Walnuts are in a Portion?

Although walnuts are a good source of protein, they’re also relatively high in natural fats and calories so if you’re calorie counting, it’s a good idea to know how many are in a portion.

The recommended portion/serving size per portion of walnuts is 1oz/28g. Based on the average walnut half weighing 2.4g (0.08oz), there are around 12 average-sized walnut halves in a serving and an average serving contains 183 calories (in kcal).

Walnut Weight & Calorie Chart

The conversion table below shows more walnut portions to help you quickly work out the weight and calories for your serving.

This chart is based on the assumption that an average half walnut kernel weighs 2.4g (0.08oz) and that walnut halves of this size contain around 16 calories.

Because walnuts are a natural product, some weigh more and some weigh less than the average amount.

Walnut serving size
(1 = a half kernel)
Average weight
(in grams and ounces)
Average calories
(in kcal)
1 half kernel2.4g/0.08oz16
2 half kernels4.8g/oz32
3 half kernels7.2g/oz48
4 half kernels9.6g/oz64
5 half kernels12g/oz80
6 half kernels14.4g/oz96
7 half kernels16.8g/oz112
8 half kernels19.2g/oz128
9 half kernels21.6g/oz144
10 half kernels24g/oz160
1 serving (12 half kernels)28g/1oz183
1/2 portion (8 half kernels)14g/0.5oz92
25g 25g/0.9oz164
50g 50g/1.8oz327
75g 75g/2.6oz491
100g100g/3.5oz654
1oz28g/1oz183
2oz57g/2oz366
3oz85g/3oz549
4oz113g/4oz732

How Much Does a Walnut Shell Weigh

If for some reason, you need to know the weight of a walnut shell, then here’s the info:

Based on an average whole walnut weight of 11g (0.4oz), containing two walnut halves weighing a total average of 4.8g (0.17oz), an empty walnut shell weighs around 6g (0.2oz).

whole walnut and half an empty shell

Walnut Weight FAQ’s

How many walnuts are in 100g?

Using an average whole weight (including the shell) of 11g (0.4oz) there are around 9 whole walnuts in 100g and based on an average half walnut kernel weighing 2.4g (0.08oz) there are around 41 walnut halves in 100g.

How many walnuts are in a pound?

Using an average whole weight (including the shell) of 11g (0.4oz) there are around 41 whole walnuts in a pound and based on an average walnut kernel weighing 2.4g (0.08oz) there are around 189 walnut halves in a pound.

How many walnuts are in a kilogram?

Using an average whole weight (including the shell) of 11g (0.4oz) there are around 91 whole walnuts in a kilogram and based on an average walnut kernel weighing 2.4g (0.08oz) there are around 417 walnut halves in a kilogram.

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