Carb Calculator

What Are Carbohydrates?

Carbohydrates are your body's preferred energy source. They break down into glucose, which fuels your brain, muscles, and organs. Carbs come in three main forms: sugars (simple carbs), starches (complex carbs), and fiber.

Simple carbohydrates (found in fruit, honey, and refined sugar) are digested quickly, providing rapid energy. Complex carbohydrates (found in whole grains, legumes, and starchy vegetables) break down slowly, providing sustained energy and keeping you fuller for longer.

• Simple carbs — Monosaccharides and disaccharides: glucose, fructose, sucrose. Found in fruit, milk, table sugar, and honey
• Complex carbs — Polysaccharides: starch and glycogen. Found in grains, potatoes, beans, and root vegetables
• Fiber — Indigestible carbs that support gut health, regulate blood sugar, and promote satiety. Found in vegetables, whole grains, and legumes

How Many Carbs Do You Need?

Daily carbohydrate needs vary widely based on your goals, activity level, and metabolic health. There is no single "right" amount — the optimal intake depends on your individual context:

• Weight loss — 100–150g/day or 25–35% of calories. Lower carbs reduce insulin, increase fat oxidation, and improve satiety
• Endurance athletes — 250–400g/day or 55–65% of calories. High glycogen stores are critical for performance in long-duration activities
• Muscle building — 200–350g/day or 40–55% of calories. Carbs fuel intense training and support recovery via insulin-mediated nutrient uptake
• General health — 150–250g/day or 45–55% of calories. The Dietary Guidelines recommend 45–65% of calories from carbs for most adults
• Ketogenic diet — 20–50g/day or 5–10% of calories. Very low carb intake forces the body to use ketones as the primary fuel source

Best Sources of Carbohydrates

Prioritize nutrient-dense, minimally processed carb sources. These provide vitamins, minerals, and fiber alongside energy — unlike refined carbs which deliver calories with little nutritional value.

• Complex carbs — Oats, quinoa, sweet potato, brown rice, legumes (lentils, chickpeas, black beans), whole-wheat bread, barley
• Fruits — Berries (blueberries, strawberries, raspberries), apples, bananas, oranges, kiwi. Rich in vitamins, antioxidants, and fiber
• Vegetables — Broccoli, carrots, bell peppers, Brussels sprouts, beets, corn, peas. Low calorie density with high nutrient content
• Fiber-rich foods — Chia seeds, flax seeds, lentils, avocado, artichokes, split peas. Aim for 25–38g of fiber daily

Carbs to limit: refined grains (white bread, white pasta), added sugars (candy, pastries, soda), sugary drinks (juice, energy drinks, sweetened coffee), and ultra-processed snacks. These spike blood sugar without providing lasting energy or meaningful nutrition.

Carb Timing for Performance

When you eat carbs matters almost as much as how many you eat — especially if you exercise regularly. Strategic carb timing can improve performance, recovery, and body composition:

• Pre-workout (1–4 hours before) — Focus on complex carbs: oatmeal, brown rice, whole-grain toast with banana. Aim for 1–4g of carbs per kg of body weight depending on session intensity and duration
• During exercise (>60 min) — For sessions longer than 60 minutes, consume 30–60g of simple carbs per hour: sports drinks, gels, or dried fruit. This maintains blood glucose and delays fatigue
• Post-workout (within 2 hours) — Replenish glycogen stores with 1–1.5g of carbs per kg of body weight. Pair with protein (3:1 or 4:1 carb-to-protein ratio) for optimal recovery