A ketogenic diet rebuilds your fuel system around fat instead of carbs. To make that switch work, your macros have to look very different from a standard plan — and the calculator math is just different enough to trip people up. This guide walks through exactly how to set keto macros, what numbers to expect, and how to keep them honest week after week.
Quick Answer
A typical keto split:
- 5% carbs — usually 20–50 g/day net carbs
- 25% protein — around 1.4–1.7 g per kg of body weight
- 70% fat — the rest of your calorie target
Set total calories with our Calorie Calculator, then run the split in our Macro Calculator with the Keto preset to get exact grams.
What Makes Keto Different
A standard "balanced" plan runs roughly 40% of calories from carbs. Keto drops that to 5%, which forces the body to use ketones (made from fat) as the primary fuel for the brain and many muscles. That state is called nutritional ketosis.
To reach and hold ketosis most people need:
- Total carbs typically under 50 g/day
- Adequate protein — high enough to preserve muscle, not so high that the liver converts large amounts of amino acids to glucose
- Fat fills the calorie gap — usually a lot of it, because each gram supplies 9 kcal vs. 4 kcal for protein or carbs
Step 1: Set Total Calories
Keto does not change the calorie equation. Total calories still drive weight change. Use the same TDEE-based logic as any other plan:
- Compute TDEE with our TDEE Calculator.
- Pick a goal — fat loss (−500 kcal), maintenance, or lean gain (+250 kcal).
- Floor the deficit at 1,200 kcal/day without supervision.
Example: a 70 kg moderately active man, TDEE ≈ 2,556 kcal, cutting at −500 → 2,056 kcal/day.
Step 2: Lock Protein First
Even on keto, protein comes first. The range is similar to a standard plan:
- 1.4–1.7 g per kg of body weight for general health and muscle preservation
- Up to 2.0 g/kg if cutting aggressively or training hard
Our 70 kg cutter at 1.6 g/kg → 112 g protein/day (~448 kcal).
You'll see lower-protein keto recommendations from older sources. Modern research is comfortable with the 1.4–2.0 g/kg range without disrupting ketosis for most people. Under-protein is the more common keto mistake, and it costs muscle.
Step 3: Set Carbs to a Hard Ceiling
Keto's defining number is total carbs. Most people enter ketosis somewhere between:
- 20 g/day net carbs — strict, fastest entry
- 50 g/day net carbs — looser, more food flexibility
Net carbs = total carbs − fibre. (Some communities also subtract sugar alcohols; the science is murkier there — go cautiously.)
For the cutter: lock carbs at 30 g/day → ~120 kcal.
Step 4: Fat Fills the Rest
Subtract protein and carb calories from the daily target. Whatever remains comes from fat.
For our cutter:
- Total calories: 2,056
- Protein calories: 448
- Carb calories: 120
- Fat calories: 2,056 − 448 − 120 = 1,488 → 1,488 / 9 ≈ 165 g fat/day
That's the unusual part of keto: a normal-sized adult can eat 150+ g of fat per day and still be in a calorie deficit. Plate planning has to account for that — vegetables alone won't get you there.
What Keto Macros Look Like on a Plate
Sample 2,000 kcal keto day:
- Breakfast — 3 eggs scrambled in 1 tbsp butter + half an avocado + bacon
- Lunch — Cobb salad: greens, 100 g grilled chicken, 1/4 avocado, 2 tbsp olive oil dressing, blue cheese
- Snack — 30 g macadamia nuts + 1 string cheese
- Dinner — Salmon (150 g) with broccoli sautéed in butter, side of mixed greens with olive oil
You will not feel hungry. Fat and protein are extremely satiating. The trap on keto is over-eating fat because it tastes good — keep the calorie target intact.
Net Carbs and Hidden Sources
Tracking gets weird on keto because carbs hide everywhere:
- Sauces (BBQ, ketchup, sweet chilli) often spike net carbs
- "Sugar-free" candies and gums sometimes use erythritol/xylitol that you may or may not count
- Some dairy carries hidden lactose: 1 cup milk ≈ 12 g carbs
- Many vegetables (carrots, onions, beets) carry more than people expect
Two principles that simplify it:
- Stick to whole foods. Meat, fish, eggs, low-carb veg, full-fat dairy, nuts, seeds, healthy oils.
- Weigh foods for the first two weeks. Your sense of "small portion" will calibrate fast.
Ketosis vs. Fat-Adapted — Two Different Milestones
These terms get used interchangeably, but they describe different stages.
- Ketosis is a metabolic state you can reach within 3–7 days of low carbs. Blood BHB above ~0.5 mmol/L confirms it. You can be in ketosis and still feel awful — the body has ketones available, but the brain and muscles haven't built the enzymes to use them efficiently yet.
- Fat-adapted is the training state your tissues reach after roughly 4–8 weeks of consistent ketosis. Mitochondria up-regulate the enzymes that oxidise fat and ketones, and energy stabilises. Athletes typically need 6–12 weeks for the adaptation to fully show in performance.
The practical implication: don't judge keto by your first week. Hunger, energy and training capacity often look very different at week 6 vs. week 1.
Variants: TKD, CKD, and Lazy Keto
The 70/25/5 split is "standard" keto. Three common variants:
- Targeted Keto Diet (TKD) — strict keto on rest days, with 15–30 g fast carbs (dextrose, banana, white rice) consumed in the hour before a hard workout. The carbs fuel the session and are usually used up before they kick you out of ketosis. Best for lifters and CrossFit athletes who need explosive output.
- Cyclical Keto Diet (CKD) — strict keto 5–6 days/week, then a 1–2 day carb refeed (300–600 g carbs) to refill muscle glycogen. Popular with physique athletes. Hardest version to dial in; many people overshoot the refeed and stay out of ketosis the entire next week.
- Lazy keto — track only carbs (under 30 g/day), eyeball the rest. Works for some people in a deficit, but loses accuracy when scale progress stalls. Switch to full tracking when troubleshooting.
For most people starting out, standard keto without cycling is the cleanest place to begin. Add a variant only once your standard macros are dialled and consistent.
Adapting to Ketosis (the First Two Weeks)
The transition is famously rough. Expect:
- Lower energy for 3–7 days while the body switches systems
- Headache, brain fog, fatigue — the so-called "keto flu"
- Salt loss as insulin drops; many issues are actually electrolyte issues
Two reliable fixes for the first two weeks:
- Electrolytes — extra sodium (2–4 g/day from real food + broth/salt), magnesium (300 mg from food or supplement), potassium (from leafy greens, avocado, salmon)
- Hydration — slightly more than usual, paired with the sodium
After about 2–3 weeks, most people feel energetic again, sometimes more stable than before.
A Keto-Friendly Food List
Stocking the kitchen around these categories makes hitting macros nearly automatic:
- Proteins: Eggs, beef, pork, lamb, chicken thighs, salmon, sardines, tuna, shrimp, full-fat Greek yogurt, hard cheeses, cottage cheese.
- Fats: Olive oil, avocado oil, coconut oil, butter, ghee, lard, tallow, mayonnaise (check ingredients), full-fat cream cheese, heavy cream.
- Low-carb vegetables: Leafy greens (spinach, kale, romaine), cruciferous (broccoli, cauliflower, cabbage, Brussels sprouts), zucchini, asparagus, mushrooms, cucumber, bell peppers, green beans.
- Nuts and seeds: Macadamias (lowest carb), pecans, walnuts, almonds, chia, flax, hemp hearts. Cashews and pistachios are higher-carb — portion carefully.
- Fruit (limited): Berries (small portion), olives, avocado, lemon and lime juice.
Foods to keep off the plate: sugar, flour, bread, pasta, rice, potatoes, beans, most fruit, sweetened yogurt, honey, syrups, beer, sweet wine, "low-fat" anything (usually carb-replaced).
MCT Oil and Exogenous Ketones — What Actually Works
- MCT oil (medium-chain triglycerides, especially C8/caprylic) is one of the few supplements with real keto-specific evidence. It bypasses normal fat digestion and elevates ketone levels within an hour. Start at 1 tsp once daily — full tablespoons trigger GI distress in many people.
- Exogenous ketone supplements (BHB salts, ketone esters) genuinely raise blood ketones for 1–3 hours. But: they do not put you into nutritional ketosis if your diet is still high-carb, and they're expensive. Their main practical use is as a pre-workout for adapted athletes, not as a shortcut into the diet.
- Coconut oil behaves like a mild MCT (~60% medium-chain) but the rest is long-chain saturated fat. Useful as a cooking fat, not a magic ketone-booster.
If a supplement claims to "put you into ketosis without changing your diet," treat it as marketing. The diet does the work.
Common Mistakes
- Treating keto as a calorie loophole. Calories still count. Too much fat-driven calorie excess and the scale won't move.
- Under-eating protein for fear of "gluconeogenesis." The body makes glucose from protein only as needed; ample protein doesn't break ketosis.
- Forgetting electrolytes. Most of the rough symptoms early on are salt/magnesium, not "carbs leaving your system."
- Carb-counting only sugar. Starches and "healthy" carbs (whole grains, beans) blow the carb cap fast.
- Using "low-carb" packaged foods as the bulk of the diet. Manufactured low-carb treats are inflammatory for some, dishonest for others.
Frequently Asked Questions
How do I know if I'm in ketosis?
The cheapest check is urine ketone strips — useful for the first few weeks. Blood ketone meters (BHB) are more accurate. Most people consistently hitting under 30 g net carbs are in ketosis within 3–7 days.
Can I do keto in a calorie surplus?
Yes, for body recomposition or muscle gain. The math is the same: surplus calories, protein anchored, carbs capped, fat fills the rest. The surplus comes from fat plus a small amount of protein.
Will keto raise my cholesterol?
Effects vary. Many people see triglycerides drop and HDL rise; LDL often increases on saturated-fat-heavy versions. Get bloodwork before and at 3 months. If LDL spikes meaningfully, lean toward unsaturated fats (olive oil, avocado, fish).
How long can I stay on keto?
Short-term (months) is well-tolerated for most healthy adults. Long-term (years) is less studied. Many people cycle keto with periods of moderate-carb eating, especially around athletic seasons.
Is keto okay for athletes?
For endurance athletes who adapt over 6–12 weeks, performance can match or beat standard diets at lower intensities. For high-intensity, glycolytic sports (sprinting, CrossFit), keto often blunts top-end performance — strategic carbs around training (TKD/CKD) may help.
Does keto affect women's hormones differently?
Some women — especially those with low body fat, heavy training loads, or stress-driven cycles — find that strict long-term keto disrupts menstrual regularity. Adding 20–50 g of clean carbs in the late evening (sweet potato, berries, rice) often restores cycles without losing the metabolic benefits. Treat persistent cycle changes as a signal to add carbs, not as something to push through.
How do I come off keto without rebounding?
Re-introduce carbs gradually, starting at ~50 g/day above your keto cap and increasing by 20–30 g/week. Keep protein where it was. Expect a 1–3 kg jump in scale weight from restored glycogen + water (each gram of glycogen carries ~3 g of water) — that's not fat regain. Add weight training during the reintroduction; muscle is a glycogen sink that prevents the new carbs from spiking blood sugar.
Bottom Line
- Lock total calories from your TDEE and goal.
- Set protein at 1.4–1.7 g/kg.
- Cap net carbs at 20–50 g/day.
- Let fat fill the remaining calories — usually a lot of it.
- Use the Keto preset in our Macro Calculator for the exact grams.
Keto is not magic. It is a specific way to structure macros that helps some people control hunger and rewire fuel use. The math is straightforward — the discipline is the hard part.
Health and fitness calculations are estimates only and not medical advice. People with type 1 diabetes, kidney disease, gallbladder issues, or who are pregnant or nursing should not start keto without medical supervision.