Carbohydrate Calculator
Work out daily carbohydrate needs for your calorie target, activity and goals.
Inputs
Use your TDEE or a goal-adjusted calorie target.
Protein calories are subtracted before distributing remaining calories to carbs and fat.
Fat calories (×9) are subtracted before calculating carb budget.
Used to show the recommended percentage range.
Daily Carbohydrates
226g/day
% of Total Calories
45.2%
Recommended Minimum
250g/day
Based on AMDR for your activity level.
Recommended Maximum
300g/day
Fibre Goal
25g/day
EFSA minimum recommendation for adults.
Step by step
Calories from protein
150 g × 4 kcal/g
= 600 kcal
Calories from fat
55 g × 9 kcal/g
= 495 kcal
Remaining calories for carbohydrates
2000 − 600 − 495
= 905 kcal
Carbohydrate grams
905 ÷ 4 kcal/g
= 226 g
How it works
Carbohydrates are the body's preferred fuel, especially during high-intensity exercise. The Acceptable Macronutrient Distribution Range (AMDR) from the Institute of Medicine sets carbohydrate at 45–65% of total calories for most adults, but athletes doing high volumes of glycogen-depleting work can push toward 70%. Rather than prescribe a percentage, this calculator derives your carbohydrate gram target after allocating protein and fat, which is how most nutrition plans are actually built.
Formula
Carbohydrate from remaining calories
Carbs (g) = (Total calories − Protein calories − Fat calories) ÷ 4
- C
- Carbohydrate grams
- E_total
- Total daily calorie target
- P
- Protein grams
- F
- Fat grams
Macronutrient recommendations are estimates based on population guidelines. Individual needs vary with metabolic health, activity, and medical conditions. This is not medical or dietary advice.
Frequently Asked Questions
Are carbohydrates essential?
The brain can adapt to run on ketones, but there is no *essential* carbohydrate the way there are essential amino acids or fatty acids. However, carbohydrates are the most efficient fuel for moderate-to-high-intensity exercise, and very-low-carb diets typically reduce peak athletic performance.
What types of carbohydrates should I prioritise?
Whole-food carbohydrates (oats, legumes, root vegetables, fruit, whole grains) provide fibre, micronutrients and slower digestion. Refined carbohydrates and added sugars should stay below WHO's 10% of total calories recommendation. Fibre intake of at least 25 g/day is associated with reduced cardiovascular and colorectal cancer risk.
Do I need to time carbohydrates around workouts?
If total glycogen stores are adequate, strict nutrient timing adds little benefit for recreational athletes. For those doing two-a-days or depleting sessions lasting over 90 minutes, consuming 30–60 g of fast carbohydrates within 30 minutes post-workout accelerates glycogen resynthesis.