Carb Calculator (Net Carbs)
Find your daily net-carb limit to reach and stay in ketosis — plus your protein, fat, and calories. Want the full macro breakdown? Use the macro calculator.
Your personalized macros appear here
Fill in your details and tap Calculate my macros to see your daily calorie, protein, fat, and carb targets.
A carb calculator tells you how many net carbs to eat per day to stay in ketosis. Most people reach ketosis at 20–50g of net carbs a day (roughly 5% of calories on keto). Net carbs = total carbohydrates − fiber − sugar alcohols, because fiber and most sugar alcohols don't raise blood glucose. Enter your details above to get your personalized daily carb limit, along with your protein, fat, and calorie targets.
How your carb limit is calculated
The calculator estimates your daily calorie needs with the Mifflin-St. Jeor equation, then allocates a percentage of those calories to carbohydrates based on your diet: about 5% for keto, 20% for low-carb, and 40% for balanced. It converts that to grams and shows the result in net carbs — the number that actually affects ketosis.
The carbs that quietly break ketosis aren't obvious foods — they're sauces, dressings, and drinks. Once you know your limit, CarbMeNot makes it easy to stay under it: it shows net carbs for every food and logs your meals from a photo.
Frequently asked questions
- How many carbs should I eat a day on keto?
- Most people reach and stay in ketosis at 20–50g of net carbs per day, with strict keto usually targeting 20–30g. This calculator sets carbs to about 5% of your daily calories for keto and assigns the rest to protein and fat.
- What are net carbs?
- Net carbs = total carbohydrates − fiber − sugar alcohols. Fiber and most sugar alcohols (like erythritol) aren't digested into blood glucose, so they don't count toward your keto carb limit. This carb calculator works in net carbs, the number that affects ketosis.
- How do I calculate my daily carb limit?
- The calculator estimates your daily calories with the Mifflin-St. Jeor equation, then allocates a share to carbs based on your diet — about 5% of calories for keto, 20% for low-carb, and 40% for balanced — and converts that to grams of net carbs.
- How low do carbs need to be to get into ketosis?
- For most people, staying under 20–30g of net carbs a day reliably triggers ketosis within a few days. Some can tolerate up to 50g, especially if very active. Start at 20g if you want to get into ketosis quickly.
- Is this carb calculator free?
- Yes — free, no signup, no email. So are the calorie calculator, macro calculator, protein calculator, and the Is-It-Keto checker.
Stay under your carb limit the easy way
CarbMeNot shows net carbs for every food and logs meals from a photo.
