Keto Macro Calculator
Get precise macronutrient targets for the ketogenic diet based on your body composition and goals.
Enter Your Values
Enter your values and press Calculate: you will get the result, its method, the inputs used and confidence, plus copy, print and share options.
How this calculator works
Unified macro allocationv2.0.0
Calories → protein (g/kg anchor) → fat (g/kg floor) → carbohydrates (residual energy), with named modes.
- Applies to
- Healthy adults
- Assumptions
- Adequate energy; no medical conditions requiring modified macros
- Limitations
- No single split is universally best; individualization matters
- Output
- g/day
- Last reviewed
- 2026-06-01
Evidence Sources & Literature
- Journal of the International Society of Sports Nutrition (ISSN position stand). Protein and exercise (protein requirements for athletes). J Int Soc Sports Nutr, 2017. doi:10.1186/s12970-017-0177-8.
About the Keto Macro Calculator
The ketogenic diet flips the usual macronutrient balance: it is very low in carbohydrates, high in fat and moderate in protein, which pushes your body to burn fat for fuel in a state called ketosis. Getting the macros right is what makes or breaks keto, and this calculator works out your daily fat, protein and carbohydrate targets in grams based on your calorie needs and goals.
Whether or not keto is the right approach for you is a personal decision (and one worth discussing with a clinician if you have health conditions), but if you do choose it, precise macros are essential. I will keep this practical and honest about what makes keto work and where people stumble.
How keto changes your fuel source
Normally your body runs mainly on glucose from carbohydrates. When you cut carbs very low, your body shifts to producing ketones from fat and using them for energy, which is ketosis. Reaching and staying in ketosis is the whole point of the diet, and it depends almost entirely on keeping carbohydrates low enough, which is why the carb target is the strictest part of the plan.
The typical keto macro split
A standard ketogenic split is roughly 70 to 75 percent of calories from fat, about 20 to 25 percent from protein, and only around 5 to 10 percent from carbohydrate, which usually means keeping net carbs under about 20 to 50 grams a day. The calculator turns those proportions into specific gram targets for you. Fat becomes your main energy source, protein stays moderate, and carbs are kept deliberately low.
Why protein stays moderate
A common mistake is treating keto as a high-protein diet, but it is not. Protein is kept moderate because very high intakes can, in some people, be converted to glucose and make it harder to stay in ketosis. The aim is enough protein to preserve muscle, with fat (not protein) as the primary fuel. The calculator sets protein at a sensible level for exactly this reason.
Making keto sustainable and balanced
If you go keto, quality still matters. Favor healthy fats (olive oil, avocado, nuts, fatty fish) over a free-for-all of processed meats and butter, and get your limited carbs from non-starchy vegetables so you still get fiber and micronutrients. Many people experience a short adjustment period (sometimes called the keto flu) and benefit from attention to fluids and electrolytes. As with any restrictive diet, check in with a clinician if you have medical conditions.
Dietitian Insight: Ketogenic diets restrict net carbohydrates to induce hepatic ketone production. Explore strategic diet adjustments in our guide to calculating macros for fat loss, verify your energy deficit using our target calorie deficit calculator, and customize meals using keto bowl options at Chipotle.
Sources & method
This calculator uses established, peer-reviewed formulas and reference ranges from recognized health and nutrition authorities. Results are estimates for general education, not a medical diagnosis. For decisions about your health, consult a qualified clinician. Reviewed by Macro & Meals Editorial Team, Content editor.
Frequently Asked Questions
What are the macros for a keto diet?
A standard ketogenic split is roughly 70 to 75 percent of calories from fat, 20 to 25 percent from protein, and only 5 to 10 percent from carbohydrate, usually keeping net carbs under about 20 to 50 grams a day. The calculator turns those proportions into specific gram targets for you.
Why is protein only moderate on keto?
Because very high protein intakes can, in some people, be converted to glucose and make it harder to stay in ketosis. Keto keeps protein moderate, enough to preserve muscle, with fat as the primary fuel rather than protein. That is why it is not a high-protein diet.
How many carbs can I eat on keto?
Most people need to keep net carbs under about 20 to 50 grams a day to reach and maintain ketosis. The carb target is the strictest part of the plan, so getting your limited carbs from non-starchy vegetables helps you stay in range while still getting fiber and nutrients.
Is the keto diet right for everyone?
Not necessarily. Keto suits some people well but is restrictive and not appropriate for everyone, especially those with certain medical conditions. If you have health concerns, discuss it with a clinician first. If you do follow it, precise macros and quality food choices are what make it work.
Explore More Categories
