Logging

Hidden calories: oil, butter, sauces and nuts

If you count calories and the results do not add up, the error usually hides in what you can barely see on the plate. Fat in the pan, butter on bread, dressing on a salad or a handful of nuts at your desk – each 'nothing' on its own, together easily 500 kcal a day.

Updated 29 October 2026 · 6 min read

In short

  • Fats have 9 kcal per gram – small amount, big number.
  • A tablespoon of oil 119 kcal, 10 g of butter 72 kcal, a handful of almonds (30 g) 174 kcal.
  • These are the items people underestimate most in their diaries.
  • A spoon instead of 'by eye' and saved recipes help a lot.

Why fats in particular

A gram of fat has about 9 kcal, a gram of protein or carbohydrate about 4 kcal. So with oil, butter or nuts a few extra grams mean tens of calories. And these are exactly the items people most often skip or underestimate – in a well-known study people logged almost half less than they actually ate.

Hidden calories table

Common hidden calories (USDA)
FoodAmountkcal
Oil (olive, sunflower)1 tbsp (13.5 g)119
Butter10 g (on bread)72
Mayonnaise1 tbsp (14 g)95
Creamy dressing (ranch)2 tbsp (30 g)129
Ketchup1 tbsp (17 g)17
Peanut butter1 tbsp (16 g)101
Chocolate hazelnut spread1 tbsp (20 g)108
Almondshandful (30 g)174
Parmesan, grated10 g42
Whipping cream2 tbsp (30 g)102
Sugar1 tsp (4 g)15

Example: one ordinary day

A tablespoon of oil in the pan (119 kcal), a thin layer of butter on bread (72 kcal), two tablespoons of dressing on a salad (129 kcal), a handful of almonds in the afternoon (174 kcal) and two teaspoons of sugar in coffee (31 kcal). Together 525 kcal – and none of it looks like 'a meal'.

Leave them out of your diary and a 400 kcal deficit can quietly become a surplus.

How to log them without stress

  1. Measure oil with a spoon or weigh the bottle before and after pouring. Oil that stays in the pan and is not poured off counts towards the dish.
  2. Put dressing and sauce on the side – you see better how much you used.
  3. Pour nuts into a bowl instead of eating from the bag.
  4. Add a note to your photo – 'fried', 'with butter', 'cream sauce' – the estimate gets more accurate.
  5. Save recipes including the fat – calculate once, then just add portions.

The goal is not to weigh every crumb. These 'invisible' items just need to be in the diary – even an estimate beats zero.

Frequently asked questions

How many calories are in a tablespoon of oil?

A tablespoon of oil (about 13.5 g) has roughly 119 kcal. This applies to olive and sunflower oil alike.

Does frying oil count?

Yes. Oil the food absorbs or that stays in the sauce counts. If you pour it off after frying, log only the part that stayed in the food.

How many calories are in a handful of nuts?

A handful of almonds (about 30 g) has roughly 174 kcal. Other nuts are similar; walnuts are slightly higher.

Sources

  1. USDA FoodData Central – Oil, olive, salad or cooking (FDC 171413)
  2. USDA FoodData Central – Butter, salted (FDC 173410)
  3. USDA FoodData Central – Salad dressing, mayonnaise, regular (FDC 171009)
  4. USDA FoodData Central – Salad dressing, ranch, regular (FDC 173592)
  5. USDA FoodData Central – Catsup (FDC 168556)
  6. USDA FoodData Central – Peanut butter, creamy (FDC 2262072)
  7. USDA FoodData Central – Chocolate-flavored hazelnut spread (FDC 168000)
  8. USDA FoodData Central – Nuts, almonds (FDC 170567)
  9. USDA FoodData Central – Cheese, parmesan, grated (FDC 325036)
  10. USDA FoodData Central – Cream, fluid, heavy whipping (FDC 170859)
  11. USDA FoodData Central – Sugars, granulated (FDC 746784)
  12. Lichtman et al. (1992), N Engl J Med – self-reported vs actual intake

This guide is general information for healthy adults, not medical advice. If you are pregnant, breastfeeding, have or have had an eating disorder, or need a therapeutic diet, talk to a doctor or registered dietitian.