About the Carbohydrate Calculator
A carbohydrate calculator converts a daily calorie target and a chosen carbohydrate percentage into grams. Carbohydrate is the body's preferred fuel for high-intensity effort, and how much you need depends far more on your training than on any general rule.
The formula
Carb grams = calories · (carb % / 100) / 4Carbohydrate provides 4 kcal per gram. At 50 percent of a 2,200 calorie diet, that is 1,100 kcal or 275 g.
How to use this calculator
- 1Enter your Body Weight (kg). The field starts at
75, which you can overwrite. - 2Enter your Daily Calorie Goal (kcal). The field starts at
2200, which you can overwrite. - 3Enter your Carb % of Diet (40–60%). The field starts at
50, which you can overwrite. - 4Read the result straight away — it recalculates as you type, so there is no button to press. Use Share to copy a link that reopens the page with your exact numbers filled in.
Worked example
| Input | Value |
|---|---|
| Body Weight (kg) | 75 |
| Daily Calorie Goal (kcal) | 2200 |
| Carb % of Diet (40–60%) | 50 |
Result
Daily Carbs: 275 grams
Carb Calories: 1100 kcal
Per kg of Body Weight: 3.7 g/kg
Max Added Sugar: 28 g
Recommended Fiber: 39 g
Those are the values the page loads with, so you can reproduce this result yourself and then change one field at a time to see what drives the outcome.
Understanding your result
Carbohydrate is stored as glycogen in muscle and liver, and glycogen is what fuels efforts above roughly 70 percent of maximum intensity. Endurance and team-sport athletes may need 5 to 10 g per kg of body weight daily to keep those stores full; a sedentary person needs far less, and the range across individuals is genuinely enormous.
Carbohydrate is not an essential nutrient in the strict sense — the body can produce glucose from protein and fat — but very low intakes impair high-intensity performance and can affect mood and sleep in some people. The quality of the source matters too: whole grains, legumes, fruit, and vegetables bring fibre and micronutrients that refined carbohydrate does not.
Things worth knowing
- Match intake to training load. Hard training days need more carbohydrate than rest days.
- Aim for 25 to 35 g of fibre daily from whole food sources, whatever your total carbohydrate intake.
- Carbohydrate around training improves performance and recovery more than the same amount eaten elsewhere.
- Each gram of glycogen holds about 3 g of water, which is why low-carb diets produce rapid initial weight loss that is not fat.
- Very low-carb approaches suit some people well and impair others. Individual response varies considerably.
Frequently asked questions
How many carbohydrates should I eat per day?+
From about 3 g per kg of body weight for sedentary people to 5 to 10 g per kg for endurance athletes. As a percentage of calories, 45 to 55 percent is a common middle ground.
Are carbohydrates necessary?+
Not strictly — the body can make glucose from other sources. But they are the most efficient fuel for high-intensity exercise, and very low intakes measurably reduce performance in that domain.
Do carbohydrates cause weight gain?+
No macronutrient causes weight gain by itself; a calorie surplus does. Carbohydrate-rich foods are often energy dense and easy to overeat, which is a different problem from the macronutrient itself.
What is the difference between simple and complex carbohydrates?+
Simple carbohydrates are short chains that digest quickly; complex ones are longer and digest more slowly. Fibre content and food matrix matter more in practice than the simple-complex distinction.