Standard keto macros: 70-75% fat, 20-25% protein, 5-10% carbs. On 2,000 calories that is approximately 165g fat, 100g protein, 25g net carbs. The carb number (20-50g net) is what determines ketosis — fat and protein fill in around it.
Written by Ash K · Last updated: June 2026 · Sources cited below
Keto macros follow one rule: keep carbohydrates low enough that your body switches from glucose to fat (ketones) as its primary fuel source. For most people, that means 20–50 grams of net carbs per day — not a percentage, a hard gram target.
The standard keto macro split is approximately 70–75% fat, 20–25% protein, and 5–10% carbs. But the only number that actually determines whether you enter ketosis is the carb limit. Fat and protein fill in the rest.
Key Takeaway: The keto macro calculator gives you gram targets, not just percentages. On a 2,000 calorie keto diet: ~25g carbs (5%), ~100g protein (20%), ~165g fat (75%). The carb number is the ceiling — stay below it to maintain ketosis. Fat is the lever you adjust for energy. Protein stays consistent.
| Macro | Percentage | Grams (2,000 cal example) | Role |
|---|---|---|---|
| Fat | 70–75% | 155–167g | Primary fuel source in ketosis |
| Protein | 20–25% | 100–125g | Muscle preservation, satiety |
| Carbs | 5–10% | 20–50g | The ceiling — determines ketosis |
Note: Percentages are starting guidelines. What actually matters: carbs below 50g (ideally 20–30g for reliable ketosis), protein at 0.7–1.0g per pound of lean body mass, and fat filling the remaining calories to match your energy target.
Standard Keto Macro Split (2,000 cal example)
Step 1 — Find your TDEE. Use our TDEE calculator to determine your maintenance calories. If fat loss is your goal, subtract 300–500 calories for a moderate deficit.
Step 2 — Set carbs. Start at 20–25g net carbs per day. This is low enough to induce ketosis in virtually everyone. You can experiment upward (30–50g) once adapted.
Step 3 — Set protein. Calculate based on lean body mass: 0.7–1.0g per pound of LBM. Don't know your LBM? Use our lean body mass calculator. If you don't have body fat data, use 0.7g per pound of total body weight as an approximation.
Step 4 — Fill the rest with fat. Subtract carb calories (carbs × 4) and protein calories (protein × 4) from your total. Divide the remainder by 9 to get fat grams.
Example — 180 lb male, 20% body fat, TDEE 2,400, targeting fat loss at 2,000 cal:
Tip: Most keto practitioners track net carbs, not total carbs. Net carbs = total carbs − fiber − sugar alcohols. An avocado has ~12g total carbs but only ~3g net carbs because 9g is fiber. The fiber doesn't spike insulin or affect ketosis. Track net carbs unless your provider recommends otherwise.
This distinction matters practically because it determines which foods are "keto-friendly." Vegetables like broccoli, spinach, and cauliflower have moderate total carbs but very low net carbs — they fit easily into keto when you track net.
Standard Keto Macro Ratios (per Published Research)
Mistake 1: Too much protein fear. Old keto advice warned that excess protein converts to glucose via gluconeogenesis and "kicks you out of ketosis." Research has largely debunked this. Gluconeogenesis is demand-driven, not supply-driven. Most people on keto can eat 1.0g protein per pound of LBM without ketosis issues. Don't under-eat protein — it costs you muscle.
Mistake 2: Not enough electrolytes. Keto causes rapid water and sodium loss in the first 1–2 weeks. If you feel terrible (headaches, fatigue, brain fog — "keto flu"), the problem is usually electrolytes, not the diet itself. Supplement 3,000–5,000mg sodium, 300–400mg magnesium, and 1,000–3,500mg potassium daily.
Mistake 3: Ignoring calories. Keto suppresses appetite for many people, which naturally creates a deficit. But fat is 9 cal/gram — it's easy to overconsume. If you're not losing weight on keto, you're eating at or above your TDEE. Macros matter, but calories still drive the physics of weight change.
Warning: Keto is not appropriate for everyone. People with type 1 diabetes, pancreatitis, liver disease, or fat metabolism disorders should not follow a ketogenic diet without medical supervision. Pregnant and breastfeeding individuals should consult their provider before restricting carbohydrates significantly. If you're on medication for diabetes or blood pressure, keto can alter your medication needs rapidly — work with your provider to adjust.
Within 2–7 days of staying below 20–50g net carbs, most people enter ketosis. Common signs: decreased appetite, increased mental clarity (after initial adaptation), fruity or metallic breath (acetone, a ketone byproduct), increased thirst and urination, and measurable ketones in urine (ketone strips) or blood (blood ketone meter reading 0.5–3.0 mmol/L).
Bottom Line: Keto macros are simpler than they seem: stay below 20–50g net carbs, eat adequate protein (0.7–1.0g/lb LBM), and fill remaining calories with fat. Use our macro calculator with the "keto" preset, or calculate manually with the steps above. Consistency with the carb limit matters more than hitting exact fat percentages.
How do I calculate my keto macros?
Find your TDEE, set carbs at 20–25g net, protein at 0.7–1.0g per pound of lean body mass, and fill remaining calories with fat. Use our keto macro calculator or follow the step-by-step above.
What is the keto macro ratio?
Approximately 70–75% fat, 20–25% protein, 5–10% carbs. But focus on gram targets, not percentages. The carb gram ceiling (20–50g) determines ketosis — the percentages are just a consequence of that constraint.
How many carbs to stay in ketosis?
Most people enter and maintain ketosis at 20–50g net carbs per day. Starting at 20g provides the most reliable ketosis induction. Some metabolically flexible individuals can stay in ketosis at 50g+.
Is a free keto macro calculator accurate?
Any calculator using TDEE estimation + the standard keto splits will give you a reasonable starting point. Accuracy depends on your activity level input. Use the result for 2–3 weeks, then adjust based on results — exactly like any macro approach.
This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider with questions about your health.