Carbohydrate Calculator
Estimate your daily carbohydrate target (in grams) from your calorie needs and goal.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
This tool provides general educational estimates only and is not medical advice. It does not diagnose, treat, or replace guidance from a qualified healthcare provider. Consult a doctor for decisions about your health.
About the Carbohydrate Calculator
The carbohydrate calculator estimates how many grams of carbohydrate to eat per day. It calculates your daily calorie target from your body measurements, activity level and goal, then assigns 50% of those calories to carbohydrate — the middle of the 45–65% range recommended by most dietary guidelines — and divides by 4 kcal per gram. Carbohydrate is the main fuel for high-intensity exercise, so active people and endurance athletes often need more, while some people prefer a lower share for weight management. Use the result as a starting point and adjust it to your training and preferences.
How to use it
- 1Select your sex and enter your age, weight and height.
- 2Choose your activity level and goal.
- 3Press Calculate to see your daily carbohydrate target in grams.
Worked example
a 30-year-old man, 75 kg and 178 cm, who exercises 3–5 days a week and wants to maintain weight needs about 2,662 kcal a day. Half of that from carbohydrate is about 333 g per day.
How it works
How it works
Around 45–65% of daily calories typically come from carbs; we use 50%. Carbs provide 4 kcal per gram.
Who it is for
People planning meals, endurance athletes fuelling training and anyone using a food-tracking app.
Why it helps
A gram target is easier to apply at meals than a percentage of calories.
Common use cases
- Setting a carbohydrate target in a food-tracking app
- Planning higher-carbohydrate days around hard training sessions
- Checking a meal plan against general guidelines
Frequently asked questions
A:Most guidelines suggest 45–65% of calories; athletes may need more.
A:No, favour whole grains, fruit and vegetables over refined sugar.
Reviewed for accuracy · Last updated October 7, 2026
Formulas follow recognised clinical references — including WHO BMI classifications, the Mifflin-St Jeor equation, and Naegele’s rule — and are periodically checked against published reference values.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
Related guides
Understanding BMI and a Healthy Weight Range
Learn how BMI is calculated, what each category means, a worked example, and the real limits of BMI as a health measure.
BMI Calculator: Check If Your Weight Is Healthy
Your weight alone does not tell the whole story. Use the CalcWisee BMI Calculator to calculate your Body Mass Index, find your weight category, and understand what it means for your health.
BMR Calculator: Calculate Your Daily Calorie Needs
Understand how many calories your body burns at rest and estimate your daily calorie needs with the free CalcWisee BMR Calculator — using the Mifflin–St Jeor Equation.