How many carbs can I eat on keto?

Most keto protocols recommend staying under 20–50g of net carbs per day to maintain ketosis. Strict keto uses 20g, while liberal keto allows up to 50g.

What is the difference between net carbs and total carbs on keto?

Net carbs = Total carbs − Fiber − Sugar alcohols. Fiber and most sugar alcohols don't spike blood sugar, so they're subtracted when counting keto carbs.

How long does it take to enter ketosis?

Most people enter ketosis within 2–4 days of restricting carbs to under 20–50g per day, though it can take up to a week depending on glycogen stores and metabolism.

Can I eat too much protein on keto?

Yes. Excess protein can be converted to glucose via gluconeogenesis and may reduce ketone production. Moderate protein (0.6–1.0g per lb of body weight) is typically recommended on keto.

Is keto safe for everyone?

Keto may not be suitable for people with certain conditions including kidney disease, pancreatitis, or type 1 diabetes without supervision. Always consult a clinician before starting a very low-carb diet.

What is lazy keto vs strict keto?

Lazy keto only tracks net carbs (keeping them under 20–50g) without tracking fat or protein. Strict keto tracks all macros to hit specific fat/protein/carb ratios.

How do I use this keto calculator?

Enter your height, weight, age, sex, activity level, goal, and keto strictness. The calculator uses the Mifflin-St Jeor formula to estimate your BMR and TDEE, then applies a keto macro split to give personalized fat, protein, and net carb targets.

Free Keto Calculator — Keto Macros, Carb Limit & Fat/Protein for Ketosis

Q: What is the keto macro ratio?

A standard keto macro split is approximately 70–75% fat, 20–25% protein, and 5–10% carbohydrates of total daily calories.

📝 Enter Your Details

Fill in all required fields to get your personalized keto macros. Body fat % is optional but improves protein accuracy.

Unit System

Biological Sex (for BMR formula)

Age (years, required)

Please enter a valid age (15–90).

Height (cm)

Please enter a valid height (120–220 cm).

Weight (kg)

Please enter a valid weight (35–300 kg).

Body Fat % (optional — improves protein estimate)

If provided, protein target uses lean body mass instead of total weight.

Please enter a valid body fat % (3–65%).

Activity Level

Please select your activity level.

Your Goal

Please select your goal.

Keto Strictness (net carbs per day)

Lower carbs = more likely to stay in ketosis.

Your Keto Macros & Results

Macros update live as you fill in your details.

👈 Fill in your details to get your keto macros

Required: age, height, weight, activity level, goal.

🔥 Daily Keto Calorie Target Goal: —

—kcal/day

Based on your Mifflin-St Jeor BMR and TDEE adjusted for your goal.

📊 Keto Macro Breakdown Ketosis: —

Daily Macro Distribution

Fat fills your energy needs. Protein preserves muscle. Carbs are kept minimal for ketosis.

Fat

Protein

🧈 Fat

—

grams/day

—%

💪 Protein

—

grams/day

—%

🌿 Net Carbs

—

grams/day

—%

Fat (target: ~70%)

Protein (~25%)

Net Carbs (~5%)

⚙️ Your Metabolic Numbers

Based on Mifflin-St Jeor BMR formula — the most widely validated estimation method for adults.

Basal Metabolic Rate (BMR)—

Total Daily Energy Expenditure (TDEE)—

Calorie Adjustment—

🌿 Net Carbs & Ketosis Target

—g net carbs/day

Your daily net carb limit to support ketosis.

What are net carbs? Net carbs are the carbohydrates that impact blood sugar and potentially interrupt ketosis.

Net Carbs = Total Carbs − Fiber − Sugar Alcohols

💡 For example: if a food has 15g total carbs, 8g fiber, and 2g sugar alcohols → only 5g net carbs count toward your limit.

📌 Total carb estimate (with ~25g fiber/day): —

💡 Personalized Keto Recommendations

Practical, research-backed guidance based on your goal, macros, and keto protocol.

Keto: —

⚠️ Disclaimer: Keto is a significant dietary change. This calculator provides estimates only — not medical advice. The keto diet is not suitable for everyone. If you have any health condition, are pregnant, or take medication, consult a qualified clinician before starting. Electrolytes (sodium, potassium, magnesium) require extra attention on keto.

🥑 Keto-optimized calculations

Know your exact macros — before you start keto

Keto is more than "eat less carbs." Fat must become your primary fuel source, protein needs to be carefully moderated, and carbs must stay low enough to trigger and sustain ketosis. This calculator gives you precise, personalized numbers — not generic ratios — so you actually hit ketosis and stay there.

What Is a Keto Calculator?

A keto calculator computes your personalized fat, protein, and net carb targets for a ketogenic diet. Unlike a standard macro calculator, a keto calculator accounts for the specific macro ratios needed to enter and maintain ketosis — the metabolic state where your body burns fat for fuel instead of glucose.

This calculator uses your BMR (Basal Metabolic Rate), TDEE (Total Daily Energy Expenditure), body weight, goal, and chosen keto strictness to generate a macro plan tailored to you — not a one-size-fits-all template.

How to Use This Keto Calculator

Choose your unit system: Metric (kg/cm) or Imperial (lbs/ft&in).
Select biological sex: Used in the Mifflin-St Jeor BMR formula.
Enter age, height, and weight: All three are required for accurate BMR calculation.
Body fat % (optional): If you know it, protein targets will be based on lean body mass.
Select activity level: Determines your TDEE multiplier.
Choose your goal: Weight loss, maintenance, or lean muscle gain adjusts total calories.
Set keto strictness: Strict (20g), Standard (30g), or Liberal (50g) net carbs per day.
Read your results: Calorie target, macro grams, BMR/TDEE, and personalized recommendations.

How the Keto Calculator Works (Formulas)

Step 1 — BMR (Mifflin-St Jeor)

Male: BMR = (10 × kg) + (6.25 × cm) − (5 × age) + 5

Female: BMR = (10 × kg) + (6.25 × cm) − (5 × age) − 161

BMR is the calories your body burns at complete rest — just to keep organs functioning.

Step 2 — TDEE (Activity Multiplier)

TDEE = BMR × Activity Factor

Activity factors: Sedentary 1.2 · Light 1.375 · Moderate 1.55 · Very Active 1.725 · Extra Active 1.9

TDEE is your total daily calorie burn including all movement and exercise.

Step 3 — Calorie Target (Goal)

Aggressive loss: TDEE × 0.75 | Loss: TDEE × 0.85 | Maintenance: TDEE × 1.0 | Gain: TDEE × 1.10

Your calorie target is adjusted from TDEE based on whether you want to lose weight, maintain, or gain lean muscle.

Step 4 — Keto Macro Split

Net Carbs: Fixed at your chosen limit (20g / 30g / 50g).

Protein: Based on total weight or lean body mass, depending on available data.

Fat: Fills the remaining calories and becomes the main energy source.

Net Carbs vs Total Carbs on Keto — Explained

One of the most important concepts on keto is understanding net carbs. Not all carbohydrates affect blood sugar and insulin the same way.

The Formula

Net Carbs = Total Carbohydrates − Dietary Fiber − Sugar Alcohols (most types)

Why Fiber Doesn't Count

Dietary fiber passes through the digestive system largely undigested. It does not significantly raise blood glucose or trigger an insulin response, so it doesn't disrupt ketosis.

Sugar Alcohols — Partial Subtraction

Common sugar alcohols like erythritol and xylitol have minimal glycemic impact and are typically fully subtracted. Others like maltitol have a higher glycemic index and may only be partially subtracted.

Food	Total Carbs	Fiber	Sugar Alcohols	Net Carbs
Avocado (100g)	9g	7g	0g	2g
Almonds (30g)	6g	3g	0g	3g
Broccoli (100g)	7g	3g	0g	4g
Keto bread (1 slice)	14g	8g	2g (erythritol)	4g
Banana (medium)	27g	3g	0g	24g ⚠️

Keto Macro Reference Table

Keto Type	Fat	Protein	Net Carbs	Best For
Standard Keto (SKD)	70–75%	20–25%	≤20–30g	Weight loss, general health
Targeted Keto (TKD)	65–70%	20–25%	+25g around workouts	Active gym-goers
Cyclical Keto (CKD)	70% on keto days	20–25%	50–150g on carb days	Athletes, bodybuilders
High-Protein Keto	60–65%	30–35%	≤30g	Muscle preservation/gain
Liberal Keto	60–65%	20–25%	≤50g	Active individuals, maintenance

Percentages are approximate. Individual ketosis thresholds vary. Always adjust based on real-world results and how you feel.

Frequently Asked Questions — Keto Calculator

Most standard keto protocols recommend keeping net carbs under 20–50g per day. Strict keto (20g) is ideal for beginners or those focused on therapeutic ketosis. Standard (30g) works for most people, and liberal (50g) suits active individuals.

A classic keto macro split is approximately 70–75% fat, 20–25% protein, and 5–10% carbohydrates. However, the best ratio depends on your metabolism, activity, body composition, and goals.

Net carbs = Total carbs − Dietary fiber − Sugar alcohols (most types). On keto, you typically track net carbs, not total carbs, because fiber and some sugar alcohols have a lower impact on blood glucose.

Most people enter ketosis within 2–4 days of keeping net carbs under 20–50g per day. This depends on glycogen stores, activity level, and how consistently carbs stay low.

Yes. Excess protein can sometimes reduce ketone production. This calculator keeps protein at a moderate level to help preserve lean mass without pushing protein unnecessarily high.

The keto flu refers to fatigue, headaches, brain fog, and cramps during the first 1–2 weeks of keto. It is usually caused by electrolyte depletion. Extra sodium, potassium, magnesium, and water often help.

Keto is not suitable for everyone. People with kidney disease, pancreatitis, type 1 diabetes, gallbladder issues, or certain medical conditions should consult a clinician before making significant dietary changes.

Lazy keto focuses mainly on keeping carbs low without carefully tracking fat and protein. Strict keto tracks all macros more precisely. This calculator supports a more structured approach with actual macro targets.

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Learn More About Keto Calculator

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Question Guide

Keto Calculator

📝 Enter Your Details

Your Keto Macros & Results

Daily Macro Distribution

💡 Personalized Keto Recommendations

Know your exact macros — before you start keto

What Is a Keto Calculator?

How to Use This Keto Calculator

How the Keto Calculator Works (Formulas)

Step 1 — BMR (Mifflin-St Jeor)

Step 2 — TDEE (Activity Multiplier)

Step 3 — Calorie Target (Goal)

Step 4 — Keto Macro Split

Net Carbs vs Total Carbs on Keto — Explained

The Formula

Why Fiber Doesn't Count

Sugar Alcohols — Partial Subtraction

Keto Macro Reference Table

Frequently Asked Questions — Keto Calculator

Learn More About Keto Calculator

How many carbs should I eat on keto?

What are net carbs on keto?

How much protein should I eat on keto?

How many calories should I eat on keto?

📝 Enter Your Details

Your Keto Macros & Results

Daily Macro Distribution

💡 Personalized Keto Recommendations

Know your exact macros — before you start keto

What Is a Keto Calculator?

How to Use This Keto Calculator

How the Keto Calculator Works (Formulas)

Step 1 — BMR (Mifflin-St Jeor)

Step 2 — TDEE (Activity Multiplier)

Step 3 — Calorie Target (Goal)

Step 4 — Keto Macro Split

Net Carbs vs Total Carbs on Keto — Explained

The Formula

Why Fiber Doesn't Count

Sugar Alcohols — Partial Subtraction

Keto Macro Reference Table

More Free Health & Nutrition Calculators

Frequently Asked Questions — Keto Calculator

Learn More About Keto Calculator

How many carbs should I eat on keto?

What are net carbs on keto?

How much protein should I eat on keto?

How many calories should I eat on keto?