Walnuts: calories and nutrition facts
Calories in walnuts per 100 g and per typical portion, from the MacroLab food catalog.
654kcal per 100 g
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To burn these 654 calories:
- 153minWalking (5 km/h)
- 64minRunning (8 km/h)
- 79minCycling (16–19 km/h)
- 89minSwimming
Times use the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.
Calories per portion
Common portions from the MacroLab catalog, next to the 100 g reference.
| Portion | kcal |
|---|---|
| 100 g | 654 |
| 1 piece (5 g) | 33 |
Can walnuts make you gain weight?
At 654 kcal per 100 g, this is a food with high energy density: just 15 g gives 100 kcal.
Calories add up fast in a small volume, so measuring helps: 100 g already has 654 kcal.
No single food makes you gain weight. What matters is your total calories over days and weeks compared with what you burn.
Walnuts vs other foods in “Nuts and seeds”
It has 11% more calories than the average food in “Nuts and seeds” (587 kcal per 100 g).
| Per 100 g | This food | Group average |
|---|---|---|
| Energy | 654 kcal | 587 kcal |
Related foods
Frequently asked questions
- How many calories are in 100 g of walnuts?
- 100 g has 654 kcal. That means about 15 g for every 100 kcal.
- How many calories are in one piece of walnuts?
- One piece (5 g) has 33 kcal.
Log walnuts with a photo in MacroLab
Snap your plate and MacroLab estimates calories and macros, then keeps your daily targets up to date.
Data from the MacroLab food catalog, updated September 26, 2026. Values vary by variety and brand; check the label of the product you buy.