Carbohydrate Calculator
Calculate your recommended daily carbohydrate intake in grams from your total daily calorie target.
- From Carbs248 g (990 kcal) · 45%
- Rest of Your Calories1,210 kcal · 55%
At 45% of calories, carbs supply 248g — the remaining 1,210 kcal is left for protein and fat.
About the Carbohydrate Calculator
Carbohydrate needs are usually expressed as a share of total calories rather than a fixed gram number, since they scale with how much you're eating overall. This calculator takes your daily calorie target and a carb percentage and converts it into grams — the number that actually shows up on food labels and in most tracking apps.
There's no single 'correct' carb percentage that applies to everyone — it depends on activity level, personal preference, and any specific dietary approach you're following, from lower-carb to endurance-athlete-high-carb. This tool doesn't tell you which percentage is right for you; it just does the gram conversion once you've picked one.
It's aimed at anyone building out a macro target for tracking purposes — someone following a specific diet plan, an athlete matching carb intake to training load, or anyone who's been told a percentage target and needs it in grams to actually log meals.
All the math happens locally — your calorie target and whatever dietary approach you're following stay on your device.
Frequently asked questions
How do I convert carb percentage to grams per day?
Multiply your daily calorie target by the carb percentage, then divide by 4 — carbohydrates provide 4 calories per gram, so that division converts the calorie share into the actual gram amount.
What percentage of calories should come from carbs?
The general Acceptable Macronutrient Distribution Range (AMDR) for carbs is about 45-65% of total calories for most adults, though specific goals — endurance training, low-carb approaches — can reasonably fall outside that range.
Why does this calculator use 4 calories per gram for carbs?
That's the standard Atwater conversion factor for carbohydrates, the same figure used on nutrition labels to calculate calories from the grams of carbohydrate listed.
Is a low-carb diet the same as this calculator showing a lower gram target?
Not necessarily — commonly cited low-carb ranges (under roughly 130g or so per day) are considerably below the standard 45% AMDR share, so you'd need to enter a noticeably lower percentage than the default to model a genuinely low-carb target.
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