How many carbs should you eat a day?
Carbohydrates are your body’s main source of energy — especially for your brain and muscles. They are found in grains, rice, bread, roti, potatoes, pulses, fruit, milk and sugar. Official guidelines suggest carbohydrates provide 45–65% of your daily calories, and at least 130 g a day for adults (the amount the brain uses). But many people — especially those with insulin resistance, PCOS, prediabetes or type 2 diabetes — do well with a moderate or lower-carb approach. This free carb calculator gives you a target in grams.
How the carb calculator works
- Your daily calorie target is estimated from your BMR (Mifflin-St Jeor equation), activity level and goal — or you can enter it yourself.
- The calculator takes your chosen percentage of calories from carbs and divides by 4 (each gram of carbohydrate gives 4 kcal).
Example: 1,800 kcal on a moderate-carb plan: 1,800 × 0.40 ÷ 4 = 180 g of carbs a day, or about 60 g per meal. On a lower-carb plan (26%) it would be about 117 g.
Carb intake levels: low, moderate and high
| Approach | Carbs per day | Level | Who it may suit |
|---|---|---|---|
| Keto / very low carb | 20 – 50 g (under 10%) | Very low | Short-term, medically supervised weight loss or specific conditions |
| Lower carb | 50 – 130 g (10 – 26%) | Low | Insulin resistance, PCOS, type 2 diabetes (with medical advice) |
| Moderate | 130 – 225 g (26 – 45%) | Moderate | Weight loss, steady energy, most adults |
| Balanced (guidelines) | 45 – 65% of calories (about 225 – 325 g on 2,000 kcal) | Normal | Active people, athletes, children and teens |
| High | Over 65% — especially refined carbs | High | Can raise blood sugar and triglycerides if carbs are mostly refined |
What does 15 g of carbs look like?
One “carb portion” of about 15 g is: ⅓ cup cooked rice, half a medium roti or chapati, 1 slice of bread, ½ cup cooked oats, 1 small apple or orange, 2 dates, ½ cup cooked lentils or chickpeas, or 1 cup of milk or laban.
Benefits of getting your carbs right
- Steadier blood sugar and energy, fewer cravings and afternoon slumps.
- Easier weight loss when carbs are matched to your activity.
- Better PCOS and insulin resistance control.
- Better training — enough carbs fuel exercise and recovery.
Health warnings
- People taking insulin or diabetes tablets can get dangerously low blood sugar if they cut carbs suddenly — speak to your doctor first.
- Very low-carb diets are not recommended in pregnancy, breastfeeding, for children, or with kidney disease or a history of eating disorders.
- Very low-carb diets can cause constipation, headaches and low energy at first; keep fibre and fluids up.
- Quality matters as much as quantity: 50 g of carbs from lentils and vegetables affects your body very differently from 50 g of sugar.
Smart carb swaps
Choose brown or mixed rice in smaller portions, whole-wheat roti instead of naan or paratha, oats instead of sugary cereals, whole fruit instead of juice, and add dal or chickpeas for slow-release carbs and protein. Check the glycemic load of your favourite foods, plan the rest of your plate with the macro calculator, and read our low-carb diet guide and insulin resistance diet.
Frequently asked questions
How many carbs should I eat to lose weight?
Many people lose weight well on 100–180 g of carbs a day, combined with a calorie deficit and enough protein. The calculator above gives a personal number based on your calories.
How many carbs a day is low carb?
Under about 130 g a day (or under 26% of calories) is generally considered low carb. Keto is much lower, usually 20–50 g a day.
How many carbs should a diabetic eat per day?
There is no single number. Many people with type 2 diabetes do well on about 30–60 g of carbs per meal, but needs depend on medication, activity and body size. Work with your doctor or dietitian.
Do I count total carbs or net carbs?
Most guidelines and food labels outside the US use available (net) carbohydrate. In the US, labels show total carbs including fibre. Subtracting fibre gives net carbs.
Is it safe to cut out carbs completely?
It is not necessary and not recommended for most people. Whole carbohydrate foods supply fibre, vitamins and minerals. Focus on quality and portion size instead.
Sources
- Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein and Amino Acids (AMDR, RDA 130 g). 2005.
- American Diabetes Association. Nutrition therapy for adults with diabetes or prediabetes: a consensus report. Diabetes Care 2019;42:731–754.
- WHO. Carbohydrate intake for adults and children: WHO guideline. 2023.