Glossary · Keto Macros

Keto Macros: How to Calculate Carbs, Protein, and Fat

In one sentence

Keto macros are the daily targets for carbohydrates, protein, and fat that keep you in nutritional ketosis. The standard distribution is roughly 70–75% of calories from fat, 20–25% from protein, and 5–10% from net carbs — typically translating to under 20–50g net carbs, 0.6–1.0g protein per pound of lean body mass, and fat as the remainder.

Macros — your daily targets for fat, protein, and carbohydrates — are the foundation of any structured ketogenic diet. Get them right and the rest of the diet largely takes care of itself. Get them wrong, and you can eat all the right foods and still fail to enter ketosis or lose weight. The two most common mistakes are eating too few calories (which stalls metabolism) and eating too much protein (which can convert to glucose via gluconeogenesis in carb-restricted states).

01

Carbs: the cap that defines keto

Net carbs are the metric that determines whether you reach ketosis. For strict keto, cap net carbs at 20 grams per day. For moderate keto, 30–50 grams. New keto dieters should start at 20g and stay there until fat-adapted (4–6 weeks), then experiment with raising the ceiling. Each gram of carbohydrate provides 4 calories, so 20g of net carbs equals 80 calories from carbs. Highly active or fat-adapted people sometimes tolerate 75g+ and stay in ketosis; insulin-resistant people often need to stay at the strict end indefinitely to see ketone production.

02

Protein: enough, but not too much

Aim for 0.6–1.0g of protein per pound of lean body mass — or 0.8–1.0g per pound of goal body weight. For most adults this lands at 80–150g of protein per day. Each gram of protein provides 4 calories, so 100g of protein equals 400 calories. Too little protein causes muscle loss during weight loss; too much can be partially converted to glucose via gluconeogenesis (though this effect is overstated — research shows gluconeogenesis is demand-driven, not supply-driven, in healthy adults). Athletes and people in muscle-building phases typically need the higher end.

03

Fat: the calorie remainder

Fat fills the calories left after carbs and protein. Subtract carb calories and protein calories from your total daily target, then divide by 9 (calories per gram of fat). Example: at a 1,800-calorie target with 20g carbs (80 cal) and 100g protein (400 cal), the remaining 1,320 calories come from 147g of fat. Fat is a satiety driver and the primary fuel source on keto, so don't fear it. The clinical literature on therapeutic ketogenic diets routinely uses 75–80% fat ratios with no adverse cardiovascular markers in healthy adults.

04

How to calculate your TDEE

Total Daily Energy Expenditure (TDEE) is the calories you burn in a typical day. Use the Mifflin-St Jeor equation: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5 for men, or − 161 for women. Multiply BMR by an activity factor: 1.2 sedentary, 1.375 light (1–3 days/week), 1.55 moderate (3–5 days/week), 1.725 very active (6–7 days/week), 1.9 athletic. The result is your TDEE. For weight loss, eat 500 calories below TDEE for roughly 1 lb of fat loss per week.

05

Adjusting macros over time

Recalculate every 10–15 pounds of weight change, after major activity-level changes, or every 3 months if your weight is stable. As you lose weight, your TDEE drops — failing to recalculate is the most common cause of weight-loss stalls. Watch for fat-adaptation signs after 4–6 weeks: hunger drops, energy stabilises, and you may need to add 100–200 calories of fat to avoid feeling overly restricted. Athletes often raise carbs to 30–50g once fat-adapted without losing ketosis. Don't drop below 1,200 calories (women) or 1,500 calories (men) without medical supervision.

Frequently asked questions

Common follow-up questions about keto macros.

How many carbs should I eat on keto?

For strict keto, under 20 grams of net carbs per day. For moderate keto, 30–50 grams. For low-carb (not strictly keto), 50–100 grams. Most people new to keto need to stay at 20g for the first 4–6 weeks to reach and stabilise ketosis, then experiment with raising the ceiling once fat-adapted.

Can you eat too much protein on keto?

It's possible but harder than internet myths suggest. Protein has a mild insulin-raising effect, and excess protein can be converted to glucose via gluconeogenesis. In practice, most healthy adults can eat up to 1.0g per pound of lean body mass without disrupting ketosis. Athletes and muscle-building phases tolerate more.

How do I calculate my keto macros?

Compute your TDEE (total daily energy expenditure) using the Mifflin-St Jeor formula and your activity level. Subtract 500 calories for weight loss. Set net carbs at 20g. Set protein at 0.6–1.0g per pound of lean body mass. Fill the remaining calories with fat (9 calories per gram). A free macro calculator is available in Keto Kit.

Should I track macros every day?

For the first 4–6 weeks, yes — log every meal until you have a good intuition for what your daily macros look like. After that, most people transition to weekly averages and only re-track when they hit a stall or change goals. Long-term keto dieters often track in periodic bursts to recalibrate rather than continuously.

Are calories more important than macros on keto?

Both matter. Macros determine whether you reach ketosis; calories determine whether you lose, gain, or maintain weight. Hitting macros perfectly while overeating leads to weight gain in ketosis. Most stalls come from underestimating calories — log accurately for two weeks before assuming a metabolic problem.

How accurate are macro calculators?

Accurate within ±10–15% for most adults. The Mifflin-St Jeor formula is the gold standard but doesn't account for individual variability in metabolism, muscle mass, and adaptation history. Treat the calculator output as a starting point; adjust based on real-world results after two weeks.

Do macros change once I'm fat-adapted?

Often slightly. Fat-adapted dieters frequently report being satisfied at 100–200 fewer calories per day because hunger drops. Some can also raise net carbs to 30–50g without losing ketosis. Recalculate every 10–15 pounds of weight change to keep macros aligned with your changing body composition.

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Ketosis

Ketosis is a metabolic state in which the body burns fat (in the form of ketone bodies) for fuel instead of glucose, typically reached when carbohydrate intake drops below 50 grams per day for two to four days.

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Net Carbs

Net carbs are the carbohydrates in a food that meaningfully raise blood glucose. The standard formula is net carbs = total carbohydrates minus fiber minus most sugar alcohols. Most ketogenic plans target 20–50 grams of net carbs per day.

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Keto Plateau

A keto plateau is a sustained stall in weight loss — typically two to four weeks with no scale movement — while remaining in nutritional ketosis. Plateaus are most often caused by macro drift, hidden carbs, calorie creep as body weight drops, and the natural slowing that occurs after the initial water-weight loss subsides.

Last updated: 2026-04-29. This article is a tracking and education resource, not medical advice. Consult a doctor before starting keto if you have a medical condition.