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:
| Conversion | Weight of One Average Walnut (with Shell) |
| Grams | 11g |
| Ounces | 0.4oz |
| Kilograms | 0.011kg |
| Pounds | 0.02lb |
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).
| Conversion | Weight of One Average Walnut half (no shell) |
| Grams | 2.4g |
| Ounces | 0.08oz |
| Kilograms | 0.0024kg |
| Pounds | 0.005lb |
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.
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 kernel | 2.4g/0.08oz | 16 |
| 2 half kernels | 4.8g/oz | 32 |
| 3 half kernels | 7.2g/oz | 48 |
| 4 half kernels | 9.6g/oz | 64 |
| 5 half kernels | 12g/oz | 80 |
| 6 half kernels | 14.4g/oz | 96 |
| 7 half kernels | 16.8g/oz | 112 |
| 8 half kernels | 19.2g/oz | 128 |
| 9 half kernels | 21.6g/oz | 144 |
| 10 half kernels | 24g/oz | 160 |
| 1 serving (12 half kernels) | 28g/1oz | 183 |
| 1/2 portion (8 half kernels) | 14g/0.5oz | 92 |
| 25g | 25g/0.9oz | 164 |
| 50g | 50g/1.8oz | 327 |
| 75g | 75g/2.6oz | 491 |
| 100g | 100g/3.5oz | 654 |
| 1oz | 28g/1oz | 183 |
| 2oz | 57g/2oz | 366 |
| 3oz | 85g/3oz | 549 |
| 4oz | 113g/4oz | 732 |
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).
Key Takeaways
- Whole Walnut Weight: The average weight of a whole walnut, including its shell, is approximately 11g (0.4oz).
- Walnut Half Weight: Typically, walnuts are sold as two half kernels inside a shell. The average weight of one-half of a walnut kernel is 2.4g (0.08oz).
- Serving Size and Calories: The recommended serving size for walnuts is 1oz/28g, which equates to around 12 average-sized walnut halves. This serving contains approximately 183 calories.
- Cup Measurements: A full US cup of walnut halves weighs about 100g (3.5oz) and contains around 41 individual walnut halves.
- Walnut Shell Weight: For those curious about the weight of the walnut shell alone, an empty walnut shell weighs roughly 6g (0.2oz), based on the average weight of a whole walnut and its kernel.
Walnut Weight FAQ’s
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.
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.
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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