You enter your daily calorie target and select a diet type — standard (30% fat), low-fat (20%), keto (70%), or a custom percentage. The tool multiplies calories by the chosen percentage to get fat calories, divides by 9 to convert to grams, estimates a saturated fat ceiling at one-third of total fat, and shows the remaining calories available for protein and carbs. It does not account for individual health conditions or activity levels.
The USDA Dietary Guidelines for Americans recommend that 20–35% of daily calories come from fat for most adults. The right amount depends on your goals, activity level, and health conditions. Consult a registered dietitian for personalized guidance.
Unsaturated fats (found in olive oil, nuts, avocados, and fatty fish) are generally considered beneficial. Saturated fats (found in butter, red meat, and full-fat dairy) should be limited. Trans fats (partially hydrogenated oils) should be avoided entirely.
Ketogenic diets aim to shift the body's primary fuel source from carbohydrates to fat. This requires a very high fat intake (typically 70–80% of calories), very low carbs (5–10%), and moderate protein (15–20%). This is a therapeutic diet that should be discussed with a healthcare provider.
The one-third rule is a simplified guideline. The American Heart Association recommends limiting saturated fat to 5–6% of total calories (about 13 grams on a 2,000-calorie diet). The calculator's estimate is a rough ceiling, not a medical target.
No. This tool calculates total fat and a saturated fat limit only. For essential fatty acid planning (omega-3 and omega-6 ratios), consult a nutrition professional or use a detailed macro-tracking app.
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.