Fat Intake Calculator
Calculate your recommended daily dietary fat intake in grams from your total daily calorie target.
AMDR Range
The Acceptable Macronutrient Distribution Range (AMDR) for fat is 20–35% of calories — your 30% target works out to 73g per day.
About the Fat Intake Calculator
Fat is the most calorie-dense macronutrient, so a small percentage shift here moves a noticeable number of grams. This calculator takes your daily calorie target and a fat percentage and converts it into the grams figure that actually appears on nutrition labels.
There's no universal 'right' fat percentage — it depends on the overall diet you're following, and lower-fat and higher-fat approaches can both fit within a healthy eating pattern. This tool just does the conversion; the percentage you pick is up to you or whatever plan you're following.
It's typically used alongside a carb or protein calculator to fill out a full macro breakdown, or by anyone who's been given a fat percentage target and needs it converted into grams for meal tracking.
The calculation happens entirely in your browser — your calorie goals and dietary details aren't logged or sent anywhere.
Frequently asked questions
How do I convert fat percentage into grams per day?
Multiply your daily calorie target by the fat percentage, then divide by 9 — fat provides 9 calories per gram, roughly double carbs or protein, so that's the conversion factor used.
What percentage of calories should come from fat?
The Acceptable Macronutrient Distribution Range (AMDR) commonly cited for fat is about 20-35% of total calories for adults, though specific diet approaches can reasonably fall outside that band.
Why does fat use 9 calories per gram instead of 4?
Fat is more energy-dense per gram than carbohydrate or protein, which each provide about 4 calories per gram — this is a basic property of the macronutrient, not a rounding choice, and it's why fat gram targets look smaller than carb or protein targets at the same calorie share.
Is a low-fat diet unhealthy?
Not inherently — very low fat intake can risk deficiencies in fat-soluble vitamins and essential fatty acids over time, which is part of why the AMDR sets a floor around 20% rather than allowing fat to go arbitrarily low.
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