Fat Intake Calculator
Result
Daily fat
- Saturated fat
- 18 g
- Saturated fat limit
- 22 g
- Linoleic acid (omega-6), minimum
- 17 g
- Alpha-linolenic acid (omega-3), minimum
- 1.6 g
Fat is two questions wearing one label. The first is how much of it to eat, which is a long-term question about how a diet is built. The second is how much of that fat may be saturated, which is a separate line from a separate body of advice — and the two are usually answered as if they were the same thing. This calculator separates them: it turns a calorie target into total fat grams, into the saturated share you typed, into the cap that share is measured against, and into the minimum omega-6 and omega-3 that any low-fat plan has to leave room for.
The saturated fat cap at four calorie targets
| Calories (kcal) | Fat at 30 percent (g) | Saturated cap at 10 percent (g) |
|---|---|---|
| 1600 | 53 | 18 |
| 2000 | 67 | 22 |
| 2500 | 83 | 28 |
| 3000 | 100 | 33 |
The cap is a fixed share of energy, so it rises in step with the calorie target while the percentages stay put; the middle column is there because the two are easy to confuse when read in grams. The 30 percent column is the page's default fat share and nothing more — it is not a target, and a plan at 25 or 35 percent will move that column while the cap stays where it is. Comparing the two columns is the fastest way to see the shape of the rule: the cap is about a third of a 30 percent fat share.
Formula
Fat (g) = target × fat% ÷ 9 · Saturated (g) = target × saturated% ÷ 9 · Cap (g) = target × 10% ÷ 9
- target
- Your daily calorie target (kcal)
- fat %
- Fat share of that target
- saturated %
- The part of that fat share you count as saturated
- cap
- Saturated fat, capped at 10 percent of energy (g)
- omega-6
- Linoleic acid, the minimum for your sex (g)
- omega-3
- Alpha-linolenic acid, the minimum for your sex (g)
Use it when you already have a calorie target and are deciding what kind of fat to buy and cook with, rather than how much to eat. The badge answers one question only: whether the saturated share you entered sits above or below the line drawn for the general population. It is not a verdict on your diet, and a low-fat plan passing the badge can still be short of the two essential fatty acids — which is why those two lines are printed next to it.
Worked examples
2,000 kcal a day, 30 percent fat, 8 percent of it saturated, male
- Fat: 2000 × 0.30 = 600 kcal from fat
- 600 ÷ 9 = 66.67, rounded to 67 g, since fat supplies about 9 kcal per gram
- Saturated: 2000 × 0.08 = 160 kcal, and 160 ÷ 9 = 17.78, rounded to 18 g
- Cap: 2000 × 0.10 = 200 kcal, and 200 ÷ 9 = 22.22, rounded to 22 g
- 18 g is under the 22 g cap, so the badge reads within the line
Both numbers are grams of the same nutrient, so the comparison is the whole point of printing them on adjacent lines: 18 against 22 is a reading anyone can do without arithmetic. Note what the cap does not say — it is not a target to spend, and 22 g is not a better day than 15 g.
2,200 kcal a day, 35 percent fat, 12 percent of it saturated, female
- Fat: 2200 × 0.35 = 770 kcal, and 770 ÷ 9 = 85.56, rounded to 86 g
- Saturated: 2200 × 0.12 = 264 kcal, and 264 ÷ 9 = 29.33, rounded to 29 g
- Cap: 2200 × 0.10 = 220 kcal, and 220 ÷ 9 = 24.44, rounded to 24 g
- 29 g is above the 24 g cap, so the badge warns
- The omega-6 minimum for a woman is 12 g, so this plan is not short of it
The cap moves with calories while the percentage you type does not, so the same eating pattern can pass at one calorie target and fail at another. That is a property of the line, not of your diet. The warning points at a direction rather than a number: trade some butter, processed meat or coconut oil for olive oil, nuts or fish, and the same total fat lands under the cap.
Limitations
The 10 percent line applies to saturated fat in the diet of a general population over the long term, and it is written as a recommendation rather than a threshold at which something happens. Someone following a ketogenic diet will sit far above the fat percentages given for the general population — around 20 to 35 percent of energy — by design, and still be under the saturated line if the fat they eat is mostly unsaturated; that is why the badge judges the share and not the total. The two essential fatty acid figures are absolute amounts for adults aged 19 to 50 from the Institute of Medicine report, and the values above 50 are slightly lower, so a plan built on this page is a little conservative for an older reader. Omega-6 minimums are floors rather than targets, and are set from the amount that prevents deficiency symptoms; intakes well above the minimum are normal. What this page cannot see is the difference between types of fat within a category: butter, lard and coconut oil are all saturated, and swapping one for another does not change the gram count at all.
Frequently asked questions
- How much fat per day should I eat?
- Advice for the general population puts fat at roughly 20 to 35 percent of energy over the long term, which on a 2,000 kcal target is about 44 to 78 g. Where you sit inside that band is a question about the rest of the diet rather than about fat itself: a plan high in refined carbohydrate usually sits low, and a plan built on olive oil, nuts and fish can sit at the top. The page does not judge this band, because a ketogenic diet sits above it deliberately.
- What is the saturated fat limit based on?
- It is the long-term population recommendation to keep saturated fat under 10 percent of energy intake, which this page converts into grams at your calorie target so it can be compared with the number you typed. It is a recommendation about a dietary pattern over years, not a threshold that makes a single meal good or bad, and it deliberately does not judge your total fat.
- Why does the badge only look at saturated fat?
- Because total fat and saturated fat are governed by different advice and the page is trying to keep them apart. Total fat is judged against a band that a ketogenic diet steps outside on purpose, so a badge on it would tell a person following a legitimate diet that they are failing. Saturated fat is judged against a line meant for everyone, so the same badge works for a keto reader and a low-fat one. Judging the share rather than the total is what makes one rule cover both.
- What are omega-6 and omega-3 minimums for?
- They are the two fatty acids the body cannot make and has to be given: linoleic acid and alpha-linolenic acid. Because they are essential, fat has a floor as well as a ceiling, and a very low-fat plan is how people fall through it — 22 g of total fat a day does not leave much room once 17 g of it has to be linoleic acid. Printing those lines next to the cap is the point of having them on the page at all.
- Is saturated fat bad for me?
- The recommendation is about a long-term population pattern, not a verdict on a food. The line exists because replacing some saturated fat with unsaturated fat is associated with better blood lipid profiles across large groups of people. What that means for one person is not something a calculator can settle, and advice for someone with a diagnosed condition comes from a clinician rather than from a percentage.
- Why does the page need my sex?
- Only for the two essential fatty acid minimums, which are set separately for men and women. Nothing else on the page changes with it: the fat and saturated fat figures are driven entirely by your calorie target and the two percentages you enter. The page has no age field, which is why the minimums it prints are the ones for adults aged 19 to 50.
References
- Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids (Macronutrients) — Institute of Medicine — National Academies Press, 2005
- Healthy diet — fact sheet — World Health Organization