Fat Intake Calculator

How much fat should you eat a day?

Fat spent decades as nutrition's villain, and plenty of people still eat as if it were 1995. The evidence moved on: dietary fat is essential — it builds hormones, cell membranes, and carries vitamins A, D, E, and K — and the official guidance now puts it at 20 to 35 percent of your daily calories. Go much below that floor for long and things start misfiring quietly: hormone levels, skin, energy, and the absorption of those fat-soluble vitamins.

The real question isn't whether to eat fat, but how much fits your calorie budget and which kinds fill it. This fat intake calculator handles the first part instantly; the guidance below covers the second.

How the calculator works

Fat is the densest macronutrient at 9 calories per gram — more than double protein and carbs. The calculator multiplies your daily calories by your chosen fat percentage and divides by nine. At 2,000 calories with the default 30 percent, that's 600 fat calories, or about 67 grams a day.

That 9-to-4 density gap is worth internalising. A tablespoon of olive oil carries 14 g of fat — around 120 calories that disappear into a salad without you noticing. Fat isn't fattening by nature, but it is the easiest macro to overeat by accident, which is exactly why a gram target is useful.

You can also enter your protein and carb percentages instead, and the calculator gives fat whatever remains — handy if you've already fixed your protein with the protein calculator or planned the full split in the macro calculator.

Which fats should fill the quota

Once you have your daily grams, where they come from matters as much as the total. The short version of decades of research:

• Unsaturated fats — olive oil, nuts, seeds, avocado, fish — should carry most of the load. These are the ones consistently linked with better heart outcomes.
• Saturated fat — butter, fatty meat, coconut oil, most cheese — is where the limits live. The Dietary Guidelines cap it at 10 percent of calories, which on 2,000 a day means about 22 g. The American Heart Association goes tighter for people with high cholesterol.
• Artificial trans fats are the one genuine villain left, and they're now banned from the US food supply — but they still appear in some imported and shelf-stable products, so 'partially hydrogenated' on a label remains a reason to put it back.

The results panel breaks your saturated fat ceiling out separately, so you can watch the one number that deserves watching.

Frequently asked questions about dietary fat

Sources and further reading

• Dietary Guidelines for Americans — fat and saturated fat limits
• American Heart Association — Dietary fats
• MedlinePlus — Dietary fats

This page is for general information only and is not medical or dietary advice. Talk to a qualified professional before making major changes to how you eat.