Fat Intake Calculator
cal
30%
Daily Fat66.7g
Fat Calories600 cal
Saturated Fat Limit22.0g
Dietary fat is calorie-dense and essential for hormones, cell membranes, and vitamin absorption, so getting the amount right matters. This calculator converts a chosen percentage of your daily calories into grams of fat, using the fact that fat provides nine calories per gram, and also flags a suggested saturated-fat ceiling. It turns a percentage-based plan into concrete daily fat targets.
Formula
Fat grams = (calories × fat% / 100) / 9; saturated limit ≈ fat grams × 0.33
- calories
- Total daily calorie target
- fat%
- Percentage of daily calories from fat
- 9
- Calories per gram of fat
How it works
- Enter your total daily calories and the percentage of those calories you want from fat (around 30% is a common choice).
- The tool multiplies calories by that percentage to get fat calories, then divides by 9 — fat's energy density — to give grams of total fat per day.
- It also estimates a saturated-fat limit at one third (about 33%) of your total fat grams, in line with advice to keep most fat unsaturated.
Worked example
A 2,000-calorie diet with 30% of calories from fat.
- Fat calories = 2,000 × 0.30 = 600.
- Fat grams = 600 ÷ 9 ≈ 66.7.
- Saturated-fat limit ≈ 66.7 × 0.33 ≈ 22 g.
About 67 g total fat per day (600 fat calories), with a ~22 g saturated-fat ceiling.
Frequently asked questions
- What percentage of calories should come from fat?
- Most dietary guidelines suggest roughly 20–35% of total calories from fat for adults. Within that range the emphasis is on unsaturated fats from sources like olive oil, nuts, and fish.
- Why is fat counted at 9 calories per gram?
- Fat is the most energy-dense macronutrient, supplying about 9 calories per gram compared with 4 for carbohydrate and protein. This calculator uses the 9 cal/g figure to convert fat calories into grams.
- How much saturated fat is too much?
- Guidance commonly recommends keeping saturated fat under about 10% of total calories. This tool estimates a ceiling near a third of your fat grams as a rough cap, favouring unsaturated fats for the remainder.
- Is a low-fat diet better than a higher-fat one?
- Not necessarily. Fat quality and overall calorie balance usually matter more than fat quantity alone. Very low fat intake can impair absorption of fat-soluble vitamins, so moderation and good fat sources are key.