Guide

Keto Macro Calculator & Beginner's Guide (2026)

Free keto macro calculator with fat/protein/carb ratios — plus a complete beginner's guide to the ketogenic diet, electrolytes, and who shouldn't try keto.

By Inlab ProductsPublished May 19, 2026Updated May 19, 20266 min read

ketoketo macro calculatorketogenic dietlow-carb

Key takeaways

Keto typically means 65–75% fat, 20–30% protein, 5–10% carbs by calories — usually 20–50g net carbs/day.
Most people enter ketosis within 2–5 days of consistent low-carb eating; some take up to 2 weeks.
Electrolytes (sodium, potassium, magnesium) are the #1 thing beginners get wrong — keto flu is mostly an electrolyte problem.
Standard keto and moderate keto produce similar weight loss; protein at 1.6–2.2 g/kg matters more than exact fat ratio.
Keto is not recommended if you're pregnant, have T1D, kidney disease, gallbladder issues, or a history of eating disorders without medical supervision.

title: "Keto Macro Calculator & Beginner's Guide (2026)" description: "Free keto macro calculator with fat/protein/carb ratios — plus a complete beginner's guide to the ketogenic diet, electrolytes, and who shouldn't try keto." publishedAt: "2026-05-19" updatedAt: "2026-05-19" author: "Inlab Products" tags: ["keto", "keto macro calculator", "ketogenic diet", "low-carb"] keyTakeaways:

"Keto typically means 65–75% fat, 20–30% protein, 5–10% carbs by calories — usually 20–50g net carbs/day."
"Most people enter ketosis within 2–5 days of consistent low-carb eating; some take up to 2 weeks."
"Electrolytes (sodium, potassium, magnesium) are the #1 thing beginners get wrong — keto flu is mostly an electrolyte problem."
"Standard keto and moderate keto produce similar weight loss; protein at 1.6–2.2 g/kg matters more than exact fat ratio."
"Keto is not recommended if you're pregnant, have T1D, kidney disease, gallbladder issues, or a history of eating disorders without medical supervision." faq:
question: "What macros do I eat on keto?" answer: "Standard keto is roughly 70% fat / 25% protein / 5% carbs by calories. For a 2,000-kcal day that's about 155g fat, 125g protein, and 25g net carbs. The calculator above sets these per your stats."
question: "How fast will I lose weight on keto?" answer: "Week 1 typically shows 2–4 kg loss — mostly water as glycogen depletes (each gram of glycogen holds ~3g of water). After week 1, weight loss settles into the same 0.5–1% body weight/week range as any well-designed deficit."
question: "Is keto better than just a calorie deficit?" answer: "For total weight loss when calories are matched, the research shows roughly equivalent results between keto and other diets. Keto's advantages are appetite suppression (many people eat less without trying) and stable energy. Its costs are social friction and the strictness."
question: "What is keto flu and how do I avoid it?" answer: "Keto flu — headaches, fatigue, brain fog in the first 3–7 days — is primarily an electrolyte issue, not a 'detox.' Replace 3–5g of sodium, 3–4g of potassium, and 300–400mg of magnesium per day during the transition. Most cases resolve within 48 hours of fixing electrolytes."
question: "Can I have cheat days on keto?" answer: "A single high-carb meal will knock you out of ketosis for 1–3 days while you re-deplete glycogen. Whether this is acceptable depends on your goal: for weight loss, occasional cheat meals are fine and the net is positive if you stay in deficit weekly. For epilepsy or therapeutic ketosis, follow medical guidance — no cheats."

The ketogenic diet — high fat, very low carbohydrate — has been around since the 1920s as a medical treatment for refractory epilepsy. Its popularity for weight loss is more recent, and (predictably) it's surrounded by both overhype and underhype.

Here's what the research actually says, plus a calculator that does the math for you.

Free keto macro calculator

Computes daily fat / protein / net carb grams for the keto style you choose.

Sex

Keto styleAgeActivityHeight (cm)Weight (kg)Deficit (15% — drag for steeper)

Daily kcal

1,805

Fat

140g

Protein

113g

Net carbs

23g

Keto definitions vary. The ratios above are common starting points; some people achieve ketosis at 50g net carbs/day, others need to stay below 20g. Track ketones (urine strips or blood meter) for the first 2 weeks to find your threshold.

Not on keto?

If you're following a general macro split (e.g. 40/30/30 or high-protein) rather than keto specifically, use the macro calculator with cheat day adjuster — it handles weekly averaging when an indulgent day blows up the daily numbers.

What is the ketogenic diet?

In a typical mixed diet, your body's primary fuel is glucose from carbohydrates. Drop carbs low enough — usually below 20–50g net carbs per day — and your liver starts producing ketone bodies (β-hydroxybutyrate, acetoacetate) from fat as an alternative fuel. This metabolic state is called ketosis.

Ketosis isn't binary — it's a continuum measured by blood β-hydroxybutyrate levels:

State	Blood β-OHB (mmol/L)
Not in ketosis	<0.5
Light ketosis	0.5–1.5
Nutritional ketosis	1.5–3.0
Deep ketosis	3.0–5.0
Diabetic ketoacidosis (dangerous)	>10

Diabetic ketoacidosis is a medical emergency and not the same as nutritional ketosis. Healthy non-diabetics don't reach DKA from dietary ketosis.

Keto macro ratios

There are several styles of ketogenic diet:

Style	Fat	Protein	Carbs	Best for
Standard keto (SKD)	70%	25%	5%	General weight loss
Moderate / "lazy" keto	65%	30%	5%	Easier compliance; small lean-mass advantage
Targeted keto (TKD)	60%	30%	10%	Athletes; carbs around workouts
Cyclical keto (CKD)	varies	varies	varies	Advanced — 5 days keto, 1–2 days carb refeed
High-protein keto	60%	35%	5%	Building muscle while keto
Therapeutic keto (epilepsy)	90%	6%	4%	Medical use only, supervised

For most weight-loss users, standard or moderate keto is the right starting point. The exact fat-to-protein ratio matters less than people think; what matters is keeping carbs low enough to maintain ketosis and protein high enough to preserve muscle.

Protein floor

Aim for at least 1.6 g/kg body weight in protein, regardless of which keto style you choose. Below that, you lose lean mass in a deficit. Some old-school "high-fat, low-protein" keto plans under-prescribe protein — don't follow them.

Electrolytes: the keto flu fix

Within 2–4 days of starting keto, glycogen stores deplete. Each gram of glycogen holds about 3g of water. So you lose 2–4 kg of weight quickly — mostly water — and along with the water, a lot of sodium and potassium.

This is what causes keto flu — headaches, fatigue, brain fog, irritability. It is not a "detox." It's an electrolyte imbalance you can fix in 48 hours.

Daily electrolyte targets on keto:

Electrolyte	Target	Easy sources
Sodium	3,000–5,000 mg	Salt your food liberally; bone broth; salted nuts
Potassium	3,000–4,000 mg	Avocado (700mg each), spinach, salmon, leafy greens
Magnesium	300–400 mg	Magnesium glycinate supplement; pumpkin seeds, dark chocolate

If you have high blood pressure or kidney disease, talk to a doctor before adding sodium. For most healthy adults, low-carb diets cause sodium deficiency, not the surplus issue medical advice usually targets.

Who should NOT try keto

Keto is well-tolerated for most healthy adults, but contraindicated or risky for:

Pregnancy — fetal development needs glucose
Breastfeeding — milk supply often drops on very low carb
Type 1 diabetes — risk of DKA if insulin timing is off
History of eating disorders — restriction triggers
Gallbladder removal — high-fat diets are harder to digest
Kidney disease — high protein is a load on the kidneys
Statins / certain blood pressure meds — dosages may need to drop quickly as the diet works; coordinate with a doctor

For anyone in these categories, work with a registered dietitian and your doctor — don't DIY.

Net carbs vs total carbs

Net carbs = total carbs − fiber − (some) sugar alcohols.

Fiber doesn't raise blood sugar meaningfully, so most keto plans count net rather than total. Some sugar alcohols (erythritol, allulose) also don't impact glucose; others (maltitol) do. When in doubt, count total carbs — it's the safer default.

A 50g net carb target with high fiber is functionally similar to a 30g total carb target. Both will keep most people in ketosis.

What to eat (high-level)

Yes:

Meat, poultry, fish, eggs
Healthy fats: olive oil, avocado, butter, ghee, MCT oil
Above-ground vegetables: leafy greens, broccoli, cauliflower, zucchini, peppers
Nuts and seeds (in moderation — carbs add up)
Berries (small portions) — the lowest-carb fruits
Full-fat dairy: cheese, Greek yogurt, heavy cream
Avocados

Limit / avoid:

Bread, rice, pasta, grains
Most fruit (bananas, mangoes, grapes are high-carb)
Beans, lentils (some keto plans include in moderation)
Sugar, sweetened anything
Most "low-fat" packaged foods (often sugar-loaded)

How Callie handles keto

Callie's tracker can switch into keto mode with one tap — net carbs become the default, the AI coach flags high-carb foods, and the macro targets adjust to your ratio of choice. The voice and photo logging work the same as any other goal mode, so you can say "khichdi with ghee" or "scrambled eggs and bacon" and Callie parses the macros without you doing the math.

Sources

Volek JS, Phinney SD. (2011). The Art and Science of Low Carbohydrate Living. Beyond Obesity.
Hall KD, et al. (2016). "Energy expenditure and body composition changes after an isocaloric ketogenic diet in overweight and obese men." Am J Clin Nutr 104(2):324-333.
Bueno NB, et al. (2013). "Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials." Br J Nutr 110(7):1178-1187.
Helms ER, et al. (2014). "Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation." J Int Soc Sports Nutr 11:20.
Westman EC, et al. (2007). "Low-carbohydrate nutrition and metabolism." Am J Clin Nutr 86(2):276-284.
Cleveland Clinic. "Ketogenic Diet." https://my.clevelandclinic.org/health/articles/24003-ketogenic-keto-diet

Important: Educational only, not medical advice. Talk to a doctor or registered dietitian before starting keto, especially if you have any of the conditions listed above.

Frequently asked questions

What macros do I eat on keto?

Standard keto is roughly 70% fat / 25% protein / 5% carbs by calories. For a 2,000-kcal day that's about 155g fat, 125g protein, and 25g net carbs. The calculator above sets these per your stats.

How fast will I lose weight on keto?

Week 1 typically shows 2–4 kg loss — mostly water as glycogen depletes (each gram of glycogen holds ~3g of water). After week 1, weight loss settles into the same 0.5–1% body weight/week range as any well-designed deficit.

Is keto better than just a calorie deficit?

For total weight loss when calories are matched, the research shows roughly equivalent results between keto and other diets. Keto's advantages are appetite suppression (many people eat less without trying) and stable energy. Its costs are social friction and the strictness.

What is keto flu and how do I avoid it?

Keto flu — headaches, fatigue, brain fog in the first 3–7 days — is primarily an electrolyte issue, not a 'detox.' Replace 3–5g of sodium, 3–4g of potassium, and 300–400mg of magnesium per day during the transition. Most cases resolve within 48 hours of fixing electrolytes.

Can I have cheat days on keto?

A single high-carb meal will knock you out of ketosis for 1–3 days while you re-deplete glycogen. Whether this is acceptable depends on your goal: for weight loss, occasional cheat meals are fine and the net is positive if you stay in deficit weekly. For epilepsy or therapeutic ketosis, follow medical guidance — no cheats.

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