Keto Macros Calculator

Standard keto macros: 70–75% calories from fat, 20–25% from protein, 5–10% from net carbs (typically 20–50 g/day). For 1800 kcal weight loss target: fat 70% = 1260 kcal ÷ 9 = 140 g; protein 25% = 450 kcal ÷ 4 = 112 g; carbs 5% = 90 kcal ÷ 4 = 22 g. The very low carbs force the body into ketosis — using ketones from fat for fuel. Most people need 2–4 weeks to fully adapt. Calculators tailor numbers based on body weight, activity level, and goals. Hitting carbs target precisely is more important than fat or protein on keto.

Most keto calculators recommend 20 to 50 g net carbs per day to stay in ketosis. Strict keto: 20 g/day, ensures rapid entry and sustained ketosis. Moderate keto: 30–40 g/day, more sustainable for most people. Targeted keto (around workouts): 50 g/day, allowing some pre-workout carbs. Net carbs = total carbs − fibre − sugar alcohols (with caveats). Below 20 g daily isn't necessary for most people and makes vegetable choices very limited. Track for 2 weeks to see how your body responds — some need stricter limits, others maintain ketosis at 40 g.

Fat dominates keto because it's the primary energy source when carbs are restricted. Without enough dietary fat, your body breaks down muscle for energy through gluconeogenesis. Fat at 70–75% provides satiety and steady energy, supports hormone production, and keeps you from overeating protein. Protein in excess on keto can convert to glucose and prevent ketosis. So fat fills the gap left by removing carbs. The shift takes adjustment — 'fat fear' from decades of low-fat dieting is hard to overcome. For most people, increasing healthy fats (olive oil, avocado, nuts, fatty fish) feels strange initially but becomes natural quickly.

Above about 1.5 g per kg body weight, excess protein on strict keto can convert to glucose via gluconeogenesis, potentially knocking you out of ketosis. Most keto guides recommend 0.8–1.5 g/kg, depending on activity level. For 70 kg adult: 56–105 g protein/day. Athletes and bodybuilders on keto can go up to 2.0 g/kg without issue, but they may need more carbs to compensate. The 'protein limits keto' concern is overstated — only very large protein intake interferes meaningfully. Protein keeps you full and protects muscle. Don't drop it too low; the body needs it more than it needs strict ketosis.

Same as in non-keto diets, but the distinction is more important on keto because every carbohydrate counts. Net carbs = total carbs minus fibre and (some) sugar alcohols. The idea: fibre and certain sugar alcohols don't significantly raise blood glucose because they aren't absorbed or metabolised normally. So a vegetable with 8 g total carbs and 5 g fibre has 3 g net carbs — fits a keto budget. Some sugar alcohols (erythritol, allulose) are largely non-impacting; others (maltitol, sorbitol) partially absorb and can affect blood sugar. Keto purists prefer total carbs to be conservative; most calculators and labels report net carbs.

Yes. As you lose weight, your calorie needs drop, so total intake (and macro amounts) need recalculation. Recheck every 5–10 kg of weight loss, or every 6–8 weeks. Some people also adjust their carb tolerance as they become more keto-adapted — a few can tolerate 60–80 g/day without leaving ketosis after several months. Others stay strict throughout. Activity changes also affect macros — more strength training may benefit from slightly higher protein. Once at maintenance weight, you can experiment with adding more carbs gradually (cyclical keto) or transition off keto if it no longer suits your lifestyle.