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Carbohydrate Calculator

Match daily carbohydrate to calories, body weight, training load and goal—then see interactive glycogen, meal timing and detailed food-quality guidance.

Advanced v15Updated July 2026 · responsive SVG results · reduced-motion support

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Quick answer

Carbohydrate needs rise with training volume. A broad adult range is 45–65% of calories, while athletes often use approximately 3–10 g/kg depending on workload.

Daily calories

Body weight (kg)

Training load

Goal

Typical workout minutes

Meals / snacks per day

Current carbs (optional g)

Carb preference

Your carbohydrate plan

Balanced

Daily target

0 g

Training range

0–0 g

Body-weight guide

Fibre target

0 g

14 g / 1,000 kcal

Added-sugar ceiling

0 g

Under 10% calories

Glycogen storage visual

Meal and workout timing

Carbohydrate quality for this target

✓ Build most intake from

△ Keep occasional or measured

Result guide

How to interpret your carbohydrate range

The range is designed to match training demand, body weight and goal. Harder or longer sessions generally need more carbohydrate than rest days.

Calculate your result to connect the guidance below with your numbers.

✓ Match carbohydrate to demand

Use a weekly rather than rigid daily targetHigher-intensity days can sit near the top of the range while rest days may sit lower.

Place useful portions around trainingA pre-session meal and post-session meal can support performance and glycogen recovery without constant snacking.

Keep fibre-rich foods as the baseWhole grains, pulses, fruit, vegetables and potatoes improve fullness and micronutrient intake.

Calibrate with performance and body trendEnergy, hunger, recovery, glucose response and weight trend show whether the starting estimate fits.

△ What needs context

The range is not a glucose prescriptionDiabetes, pregnancy and some metabolic conditions require personalised carbohydrate timing and monitoring.

Liquid sugar is easy to overshootSports drinks are mainly useful for prolonged demanding exercise, not routine hydration.

Very low carbohydrate can affect trainingSome people experience poorer high-intensity performance, sleep or recovery when intake is cut abruptly.

Pre-workout fibre and fat affect comfortHealthy foods can still cause gastrointestinal symptoms when a large portion is eaten too close to hard exercise.

How the carbohydrate target is calculated

The calculator starts with a percentage of calories based on training load, then adjusts for your goal and preference. It also shows a sports-nutrition range in grams per kilogram so you can see whether the calorie-based target matches your workload.

Carbohydrate grams = calories × carbohydrate percentage ÷ 4

Carbohydrate and training

Muscle glycogen is a major fuel for moderate-to-high intensity exercise. Longer and more frequent sessions usually raise carbohydrate needs, while rest days can sit nearer the lower end of the range.

Quality and timing

Choose most carbohydrates from minimally processed foods that also provide fibre or nutrients. Around hard training, lower-fibre choices can be useful because they digest more quickly; at other meals, whole grains, beans, fruit and vegetables are usually more filling.

Medical diets need professional guidance

Diabetes, reactive hypoglycaemia, kidney disease, pregnancy and medically prescribed ketogenic diets require individual advice. This calculator provides general education only.

Practical guide for using this result

How the target is built

The calculator blends calorie percentage, body-weight training ranges, workout duration, activity and goal, with a minimum carbohydrate reference.

Workout timing

Longer or harder sessions usually benefit from more carbohydrate before and after, while short easy sessions may need no special timing.

Interpreting the glycogen visual

The tank represents relative carbohydrate availability, not a direct measurement of muscle glycogen.

How to use a carbohydrate target in real meals

The target is best treated as a range that moves with training volume, appetite and total calories rather than as a fixed number that must be hit perfectly every day.

Place more carbohydrate around demand

Oats, rice, potatoes, fruit, bread and pulses are especially useful before and after longer or harder sessions. Rest days may need less depending on appetite and goals.

Keep quality and fibre visible

Whole grains, beans, fruit and starchy vegetables provide more fibre and micronutrients than relying mainly on sweets or sugary drinks.

Adjust for medical needs

Diabetes medication, gastrointestinal conditions and some endurance events require individual timing and portion advice. The calculator does not replace a clinician or sports dietitian.

Sources & references

National Academies Dietary Reference Intakes for carbohydrate.
Thomas DT, Erdman KA, Burke LM. Nutrition and Athletic Performance.
Dietary Guidelines for Americans, added sugar and whole-food guidance.

Frequently asked questions

How many carbohydrates should I eat per day?

A broad adult range is 45–65% of calories, but needs vary with activity and goals. Athletes often use body-weight-based ranges because training volume strongly affects glycogen use.

Is 130 g of carbohydrate a minimum?

The adult RDA is 130 g per day, based largely on average brain glucose use. Some medically supervised eating patterns use less, but this tool is not a therapeutic diet prescription.

Are all carbohydrates the same?

No. Beans, whole grains, fruit, vegetables and dairy provide fibre or nutrients. Sugary drinks, sweets and refined snacks are easier to overconsume and provide less satiety.

How many carbs should I eat before exercise?

For ordinary sessions, a normal meal may be enough. Longer or harder training often benefits from a carbohydrate-containing meal 2–4 hours before and, for sessions over about 60–90 minutes, carbohydrate during exercise.

Should I cut carbs to lose fat?

You need a sustainable calorie deficit, not necessarily very low carbohydrate. Keep enough protein and fibre, then choose a carbohydrate level you can maintain and that supports training.

Is 130 g a universal minimum?

It is a general reference used for adult brain glucose needs, not an individual medical prescription. Therapeutic low-carbohydrate diets require supervision.

Should endurance athletes use the highest range every day?

Not always. Intake can rise on long or intense days and fall on easier days while the overall diet remains adequate.

Do I need the same carbohydrate intake every day?

No. Many people use more carbohydrate on long or intense training days and less on light or rest days while keeping the weekly calorie plan consistent. The best pattern is the one that supports performance, digestion and adherence.