The formula
How it works
Work out how many grams of fat to eat each day, from your calorie target and the share of calories you want from fat. Guidelines usually suggest 20–35% of calories from fat for a healthy diet.
FAQ
Is dietary fat bad for you?
No — fat is an essential nutrient needed for hormones, vitamin absorption and cell health. What matters is the type: unsaturated fats from oils, nuts and fish are healthy, while too much saturated and trans fat is best limited.
How low can I go?
Guidelines rarely recommend below about 20% of calories from fat, since very low intakes can affect hormones and the absorption of fat-soluble vitamins. This calculator’s slider starts at 15% as a floor.
How does fat compare to carbs and protein in calories?
Fat has 9 calories per gram, more than double the 4 calories per gram in carbs or protein, which is why a small amount of fat adds up quickly. That is also why fat grams look lower than carb or protein grams for the same number of calories.
What foods are high in fat?
Oils, butter, nuts, seeds, avocado, fatty fish and fried foods are all concentrated sources of fat. Reading nutrition labels for grams of fat per serving is the easiest way to see how a food fits your daily target.
Should I aim for the higher or lower end of the range?
It depends on your goals and the rest of your diet — active people building muscle often lean toward lower fat to leave room for carbs, while low-carb or keto eaters aim much higher. There is no single right answer, only what fits your overall plan.
Does the type of fat matter as much as the amount?
Yes — this calculator only tells you the total grams, not the mix. Prioritizing unsaturated fats from plants and fish over saturated fats from processed and fatty animal foods matters for long-term heart health.
Can eating more fat help with weight loss?
Fat can increase satiety and slow digestion, which may help some people eat less overall, but weight loss still comes down to total calories in versus out. Raising fat’s share only helps if it does not push your total calorie intake above your target.
About the fat intake calculator
This calculator finds how many grams of fat you should eat in a day, from your calorie target and the proportion of calories you want from fat. Fat is the most energy-dense nutrient and is essential for health, but it is easy to over- or under-do. Converting a percentage of calories into grams gives you a concrete target to track, and shows why fat grams are lower than carb or protein grams for the same calories.
How to use it
Enter your daily calorie target and slide to the share of calories you want from fat — most guidelines land between 20% and 35%. The calculator shows the equivalent grams per day. For example, 2,000 calories with 30% from fat works out to about 67 g of fat. Because fat packs 9 calories per gram, the gram figure stays modest even at a generous percentage.
The formula
Fat provides 9 calories per gram — more than double carbs or protein — so the grams are the fat calories divided by 9: , where is the percentage of calories from fat. So 30% of 2,000 calories is 600 fat calories, which at 9 per gram is about 67 g. The high energy density is why small changes in fat can shift total calories a lot.
Where it is used
People balancing their macros use it alongside carbohydrate and protein targets to plan meals, and those on higher-fat approaches like keto use it to hit a large fat share deliberately. Dietitians set fat targets for heart health and weight management, and it feeds into any calorie- and macro-tracking routine. Knowing your fat grams helps you build meals that hit your calories without guesswork.