🥖 Carbohydrate Calculator
Carbohydrate Calculator: Daily Carb Intake, Net Carbs & Macro Calculator
This free carbohydrate calculator estimates how many grams of carbs you should eat each day, based on your body measurements, activity level and goal. It gives separate recommendations for weight loss, maintenance and muscle gain, and shows your calories, protein, fat, fiber and net carbs alongside.
Quick answer: on a 2,000-calorie diet, 45 to 65 percent of calories from carbs is roughly 225 to 325 grams a day. This calculator uses 40 to 50 percent, depending on your goal. Enter your age, gender, weight, height, activity level and goal to get your own daily carb intake in grams.
What Are Carbohydrates and Why Do They Matter?
Carbohydrates are one of the three main macronutrients, alongside protein and fat. They are the body's preferred fuel for the brain and for physical activity, and your body stores extra as glycogen in the muscles and liver. Simple carbohydrates such as sugar, sweets and soft drinks digest quickly. Complex carbohydrates such as whole grains, oats, beans, brown rice and sweet potatoes digest slowly and give steady energy. Cutting carbs out completely without medical supervision can leave you tired and hurt performance and recovery.
How This Carb Calculator Works
It first estimates your calories burned at rest with the Mifflin-St Jeor equation (BMR), then multiplies by an activity factor to get your daily energy needs (TDEE). Calories are adjusted for your goal and split between carbohydrates, protein and fat.
| Goal | Calories | Carbs | Protein | Fat |
|---|---|---|---|---|
| Weight loss | TDEE − 350 | 40% | 35% | 25% |
| Maintenance | TDEE | 50% | 25% | 25% |
| Muscle gain | TDEE + 350 | 50% | 30% | 20% |
Carbohydrates provide 4 calories per gram, so your carb grams are your carb calories divided by 4. Fiber is set at 14 grams per 1,000 calories, and net carbs are your total carbs minus fiber. For example, a 30-year-old man who weighs 70 kg, is 170 cm tall and is moderately active needs about 2,507 calories. At maintenance with 50% from carbs, that is about 313 grams a day.
Carbs for Weight Loss and Muscle Gain
Carbs do not automatically cause weight gain. What drives weight loss is a sustainable calorie deficit, so in weight loss mode the calculator lowers your calories by 350 a day (never below 1,200 for women or 1,500 for men) and keeps protein higher to keep you full. For muscle gain it adds 350 calories and keeps carbs at 50%, which helps refill glycogen and speed recovery. Choose fiber-rich carbs such as oats, rice, potatoes, fruit and whole grains, and limit sugary drinks, sweets and highly processed snacks.
A Note on Low-Carb and Keto Diets
The results here are higher than ketogenic levels, so this tool is not designed for keto or other very-low-carb plans. The calculator is for healthy adults. Teenagers, pregnant or breastfeeding women and people with medical conditions have different needs and should talk to a doctor or registered dietitian.
Use It With Your Other Numbers
Combine your carb target with the calorie calculator for your full daily energy needs, the BMR calculator for your resting calories and the body fat calculator to track your body composition.
How to Use This Carbohydrate Calculator
Enter your age and gender
Choose M or F, because the BMR formula differs slightly for each.
Enter your weight and height
Choose kg or lb for weight, and cm or in for height.
Choose your activity level
Pick from sedentary to very active, based on a typical week.
Choose your goal
Select loss, maintain or gain.
Click "Calculate Carbs"
Your daily carbs, calories, protein, fat, fiber, net carbs, BMR and TDEE appear instantly.