Carbohydrate Calculator
cal
50%
Daily Carbs250g
Carb Calories1,000 cal
Carbohydrates are the body's main fuel, and this calculator translates a share of your daily calories into grams of carbs to eat. You provide your daily calorie target and the percentage of calories you want from carbohydrates, and it works out the gram total using the fact that carbs supply four calories per gram. It is a simple bridge between a calorie plan and a concrete daily carb goal.
Formula
Carb grams = (calories × carb% / 100) / 4
- calories
- Total daily calorie target
- carb%
- Percentage of daily calories from carbohydrates
- 4
- Calories per gram of carbohydrate
How it works
- Enter your total daily calories and choose the percentage of those calories that should come from carbohydrates (for example 50%).
- The tool multiplies calories by that percentage to find carb calories.
- It divides carb calories by 4 — the energy density of carbohydrate — to give grams of carbs per day, shown alongside the carb-calorie figure.
Worked example
A 2,000-calorie diet with 50% of calories from carbohydrates.
- Carb calories = 2,000 × 0.50 = 1,000.
- Carb grams = 1,000 ÷ 4 = 250.
250 g of carbohydrates per day (1,000 carb calories).
Frequently asked questions
- What percentage of calories should come from carbs?
- General guidelines suggest roughly 45–65% of calories from carbohydrates for most people. Endurance athletes often go higher, while low-carb plans go much lower; the right share depends on your goals and activity.
- Why are carbs counted at 4 calories per gram?
- Carbohydrate yields about 4 calories of energy per gram when metabolised, the same as protein, whereas fat yields 9. This calculator uses the standard 4 cal/g figure to convert carb calories into grams.
- Should I count all carbs or just net carbs?
- This tool reports total carbohydrate grams. "Net carbs" subtract fibre and some sugar alcohols, a concept popular in low-carb diets, but total carbs are the standard reference for most dietary guidance.
- How do I find my daily calorie target to enter here?
- Use a calorie calculator that accounts for your BMR, activity level, and goal. That target then feeds this tool so your carb grams stay consistent with your overall energy plan.