Keto Macro Calculator — Find Your Personal Keto Targets
Get your personalized daily carb, protein, and fat targets for a ketogenic diet — based on your stats, goal, and activity level.
What Is a Keto Calculator and Why Do You Need One?
A ketogenic diet works by severely restricting carbohydrates, pushing the body into a metabolic state called ketosis where it burns fat for fuel instead of glucose. But exactly how many carbs, how much protein, and how much fat you need each day depends on your body size, activity level, and goal — and the generic "70/20/10" ratio is a starting point designed for an average person, not you specifically.
Why Generic Keto Ratios Don't Work for Everyone
A 90 kg man training five days a week and a 55 kg sedentary woman have very different calorie needs, and therefore very different absolute macro needs even if their percentage ratios look the same. The percentages also shift depending on whether your goal is fat loss, maintenance, or muscle gain. This calculator does the math from your actual TDEE so your numbers are built for your situation.
How Personalized Keto Macros Lead to Better Results
The most common reason keto stalls is eating the right macro ratios but the wrong total calories — either too many (no deficit for fat loss) or too few (muscle loss and metabolic slowdown). Starting from a calibrated TDEE, then layering the keto macro split on top of it, is the approach used in evidence-based dietary practice.
How to Use This Keto Calculator
Step 1 — Enter Your Personal Stats
Enter your sex, age, height, and current weight. These feed the Mifflin-St Jeor formula — the most validated BMR equation for the general population — which is the foundation of your calorie calculation.
Step 2 — Set Your Goal (Weight Loss / Maintenance / Muscle Gain)
For weight loss, the calculator applies a 20% calorie deficit from your TDEE. For maintenance, you eat at TDEE. For muscle gain, a 10% surplus is added. These are conservative adjustments that support meaningful progress while minimizing side effects like fatigue or muscle loss.
Step 3 — Choose Your Activity Level
Activity level multiplies your BMR to produce your Total Daily Energy Expenditure (TDEE). Be honest here — most people who sit for work are sedentary or lightly active even if they exercise a few times a week.
Step 4 — Set Your Keto Strictness Level
Standard keto caps net carbs at around 25 g per day and is most likely to produce reliable ketosis. Moderate keto allows up to 50 g, which some people find easier to sustain. Lazy keto (up to 100 g) may still reduce carbs enough to produce some benefits but may not reliably trigger deep ketosis in most people.
Reading Your Keto Macro Results
The results show your total daily calorie target, grams of fat, protein, and net carbs, their percentage of total calories, and a per-meal estimate split across three meals.
How the Keto Calculator Works
Calculating Your TDEE (Total Daily Energy Expenditure)
Men: (10 × kg) + (6.25 × cm) − (5 × age) + 5
Women: (10 × kg) + (6.25 × cm) − (5 × age) − 161
TDEE = BMR × activity multiplier (1.2 to 1.9)
Setting the Carb Limit for Ketosis
Most research on ketogenic diets defines nutritional ketosis as a state achieved when net carbohydrate intake falls below roughly 50 g per day, with many people requiring 20-25 g to reliably reach measurable blood ketone levels. This calculator allocates 5% of target calories to carbs for standard keto, 10% for moderate, and 20% for lazy.
Protein: The Most Important (and Misunderstood) Keto Macro
Protein is often treated as the afterthought on keto, with people focusing on carbs and fat. In practice, protein is the most important macro to get right. It's set at 1.5–2.0 g per kg of body weight to preserve muscle during the deficit, then the remaining calories go to fat. Getting enough protein also improves satiety and reduces the risk of losing lean mass while losing fat.
Fat: How to Fill the Remaining Calories
Once carbs and protein are set, fat fills the remaining calories. Fat is the primary energy substrate on keto, so a high fat intake is expected and necessary — not something to feel guilty about. Fat also provides satiety and the fat-soluble vitamins (A, D, E, K) that are important for long-term health.
Net Carbs vs. Total Carbs — Which Should You Track?
Net carbs = total carbs − dietary fiber − sugar alcohols (where applicable). Fiber passes through the digestive system without being absorbed as glucose, so it doesn't meaningfully affect blood sugar or ketosis. This is why most keto practitioners track net carbs rather than total carbs. Our Carb Calculator covers net carbs in more detail.
Understanding Your Keto Macro Results
Sample Results Table (Weight Loss vs. Maintenance)
| Profile | Calories | Fat | Protein | Net Carbs |
|---|---|---|---|---|
| 35F, 70 kg, moderate, lose | 1,420 | 95 g | 105 g | 18 g |
| 35F, 70 kg, moderate, maintain | 1,770 | 122 g | 105 g | 22 g |
| 35M, 85 kg, moderate, lose | 1,840 | 123 g | 128 g | 23 g |
These are illustrative examples. Your actual results will differ based on your inputs.
What to Do If You're Not Losing Weight on Keto
The most common culprits: hidden carbs in processed "keto" foods, eating too much total food even if macros are correct, or underestimating portions. A secondary issue can be that your TDEE estimate is slightly off — if you hit a plateau after 3-4 weeks, try reducing calories by 100-150 more per day rather than making a large change.
Adjusting Macros as You Progress
As you lose weight, your TDEE decreases, so recalculating your macros every 5-10 kg of weight loss (or every 6-8 weeks) is worth doing to avoid progressively eating more than your updated maintenance requires.
The Science Behind Ketogenic Diets
What Is Ketosis?
Ketosis is a metabolic state where the liver converts fatty acids into ketone bodies (primarily beta-hydroxybutyrate, acetoacetate, and acetone) that the brain and muscles can use for energy instead of glucose. It's a normal physiological process that occurs during fasting or very-low-carbohydrate eating.
Benefits Supported by Research
Ketogenic diets have the strongest evidence in three areas: significant short-term weight loss (greater than many other diets at 6 months, though differences shrink at 12-24 months), meaningful improvement in blood glucose and HbA1c in type 2 diabetes (under medical supervision), and dramatic seizure reduction in drug-resistant epilepsy, where the diet was originally developed.
What the Research Doesn't Show
Long-term data (beyond 2 years) on hard health outcomes is limited. Keto tends to reduce HDL benefits from high saturated fat intake and can elevate LDL cholesterol in some people. It's not proven to be superior to other calorie-equivalent diets for most health outcomes in the very long run.
Keto for Specific Goals
Keto for Women Over 50 and Hormonal Considerations
Post-menopausal women may find keto effective for managing weight and insulin resistance, but some women in perimenopause find very-low-carb eating disrupts sleep or worsens hot flashes, likely due to effects on serotonin and cortisol. A moderate keto approach (50 g net carbs) is often better tolerated than strict keto for this group.
Keto and Type 2 Diabetes — Clinical Caution Required
Ketogenic diets can lower blood glucose significantly and quickly, which means diabetes medications (especially insulin and sulfonylureas) may need to be reduced to avoid dangerous hypoglycemia. Never start keto if you have diabetes without first talking to your doctor — this is a medical safety issue, not a general nutrition caution.
Who Should Use This Calculator?
Healthy adults who have already decided to try keto and want a data-driven starting point for macros, rather than guessing from a generic ratio. Also useful for coaches and dietitians looking for a quick reference for clients.
Who Should NOT Start Keto Without Medical Supervision?
- People with type 1 or type 2 diabetes (risk of diabetic ketoacidosis or hypoglycemia)
- People with kidney disease or a history of kidney stones
- People with liver disease or disorders of fat metabolism
- Pregnant or breastfeeding women
- Anyone with a history of an eating disorder
- Children and adolescents (unless under medical supervision for a condition like epilepsy)
Frequently Asked Questions
How many carbs can I eat on keto?
Standard keto typically limits net carbs to around 20-25 g per day. Moderate keto allows up to 50 g, and lazy keto allows up to ~100 g.
How much protein is too much on keto?
Targets of 1.5-2.0 g per kg of body weight are generally effective. Consistently very high protein can reduce ketone production, but moderate to moderately high protein is safe and beneficial for preserving muscle.
Will too much fat kick me out of ketosis?
No. Dietary fat doesn't disrupt ketosis. Eating too much fat will add calories and slow weight loss from body fat, but the fat itself won't break ketosis — only carbohydrates do that.
How long does it take to enter ketosis?
Typically 2-4 days of strict carb restriction. Full fat-adaptation — where the body efficiently uses ketones — takes 4-6 weeks.
Can I do keto if I'm vegetarian or vegan?
Vegetarian keto is achievable with eggs, dairy, nuts, and low-carb vegetables. Vegan keto is harder but possible. A dietitian can help build a nutritionally complete plan.
What are the keto macros for a 1,200-calorie diet?
At 1,200 cal on standard keto: roughly 15 g net carbs, 60 g protein, 100 g fat. Very low-calorie keto increases risk of nutrient deficiencies — consult a dietitian before restricting this severely.
Is this keto calculator suitable for diabetics?
No — not without medical supervision. Keto can significantly lower blood sugar and may require medication adjustment. Talk to your doctor first.
How is this different from a general macro calculator?
This calculator starts from your TDEE, then sets carbs within the physiological range for ketosis (5-20% of calories) and builds protein and fat around that. A general macro calculator just lets you enter any percentage you choose.
Limitations and When to Consult a Dietitian
Formula-based TDEE estimates carry an error margin of roughly ±10-15%. If you're not losing weight despite following your calculated macros for 3-4 weeks, consider working with a registered dietitian who can troubleshoot your intake, food quality, and any medical factors that may be affecting your results.
References & Medical Sources
- Epilepsy Foundation — The Ketogenic Diet (epilepsy.com).
- Bueno, N.B. et al. (2013). Very-low-carbohydrate ketogenic diet vs. low-fat diet for long-term weight loss. British Journal of Nutrition.
- American Diabetes Association — Standards of Medical Care in Diabetes 2024 (diabetes.org).
- Mifflin, M.D. et al. (1990). A new predictive equation for resting energy expenditure in healthy individuals. American Journal of Clinical Nutrition.