Fat Intake Calculator
Find your daily fat target in grams from calories.
Results update as you type.
This calculator provides estimates based on population research. Results are not medical advice. Consult a qualified healthcare provider before making health or nutrition decisions.
How it works
Dietary fat is an essential macronutrient that provides energy, supports hormones, and helps absorb certain vitamins, and this calculator translates a fat goal expressed as a percentage of calories into grams per day. You enter your total daily calories and select the share of those calories you want from fat, and it returns your daily fat target in grams along with the calories that fat represents. The conversion relies on the fact that fat is calorie-dense, supplying nine calories per gram, more than double the four calories per gram from carbohydrates or protein. So the calculator multiplies your calories by the fat percentage to get fat calories, then divides by nine to get grams. Nutrition guidelines commonly recommend that fat make up roughly 20 to 35 percent of total calories for adults, which is why the options fall in that range. Within that total, the type of fat matters: unsaturated fats from nuts, seeds, fish, and oils are healthful, while saturated and trans fats should be limited. This tool gives a general planning target for healthy adults and is not medical or dietetic advice; individual needs depend on your goals, health, and overall diet, so consult a professional for personalized recommendations. Enter your daily calories and target fat percentage to compute your fat intake.
Fat (g) = calories × fat% / 9
The calculator finds the calories that should come from fat by multiplying total daily calories by the target fat percentage, then divides by 9, since each gram of fat provides 9 calories. This converts a percentage-of-calories fat goal into a concrete daily target in grams for meal planning within a balanced diet.
Source:Dietary Guidelines for Americans
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter daily calories and fat as % of calories.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Daily fat target updates instantly as you type — no button to press.
Frequently asked questions
How many grams of fat should I eat per day?
It depends on your calories and target fat percentage. Guidelines suggest fat make up about 20 to 35 percent of calories. Multiply your daily calories by that percentage, then divide by nine, since fat has nine calories per gram. The calculator does this to give your daily fat target in grams.
Why divide by nine?
Each gram of dietary fat provides nine calories, more than the four calories per gram in carbohydrates and protein. To convert calories from fat into grams, you divide by nine. This energy density is why fat contributes a lot of calories in small amounts and why portion awareness matters with fatty foods.
What percentage of calories should come from fat?
Common dietary guidelines recommend that fat provide roughly 20 to 35 percent of total daily calories for adults. Within that range, the exact figure depends on your diet style and goals. Very low-fat and higher-fat approaches exist, but 20 to 35 percent suits most balanced diets, which is why the calculator offers those options.
Does the type of fat matter?
Yes, quality matters as much as quantity. Unsaturated fats from sources like olive oil, nuts, seeds, avocado, and fatty fish support heart health, while saturated fats should be moderated and artificial trans fats avoided. This calculator gives a total fat target; aim to fill most of it with healthful unsaturated sources for the best nutrition.
Is this medical advice?
No. This calculator provides general planning guidance for healthy adults based on standard macronutrient ranges. Your ideal fat intake depends on your health, goals, activity, and any medical conditions. For personalized dietary advice, especially if you have heart disease, diabetes, or other concerns, consult a registered dietitian or your doctor.