Calorie Calculator (Macros)
Convert protein, carbs and fat grams into kilocalories using the 4-4-9 rule, with a food quick-reference table.
| Food | kcal |
|---|---|
| Cooked white rice | 130 |
| Boiled egg | 155 |
| Grilled chicken breast | 165 |
| Grilled salmon | 208 |
| Rolled oats (dry) | 389 |
| Almonds | 579 |
| White bread | 265 |
| Cooked pasta | 158 |
| Boiled potato | 87 |
| Apple | 52 |
| Banana | 89 |
| Avocado | 160 |
| Dark chocolate 70% | 604 |
| Whole milk | 61 |
What is it
Every gram of macronutrient carries a known energy price: protein and carbs deliver about 4 kcal per gram, fat about 9. Type in your grams and this tool shows the total kilocalories at once — the same math nutrition labels run on the back of every package.
Notes & fun facts
Ever wondered why a spoonful of oil ruins an otherwise light salad? Fat packs 9 kcal per gram — more than double carbs — so 10 g of dressing costs you as much as 50 g of rice. That asymmetry is why calorie tracking quietly punishes the bottle, not the bowl.
Origin & history
These 4/4/9 factors come from American chemist Wilbur Olin Atwater, who in the 1890s burned food samples in a bomb calorimeter and measured how much heat each macronutrient released. His 1896 tables became the Atwater system, still the basis of food labels worldwide.