Carb Calculator

Carbohydrate includes sugars, starches and fiber. Sugar and starch are present in many grains, fruits, vegetables and legumes. Fiber is treated differently by different label conventions, so the same carbohydrate word does not always identify the same entered amount.

The general 4/4/9 convention assigns 4 kcal/g to carbohydrate and protein and 9 kcal/g to fat. 21 CFR 101.9(c)(1) also describes other food-energy methods and specific factors for fiber and polyols. The chosen convention here is conditional planning arithmetic, not a reconstruction of every food label. Checked September 30, 2026.

1. Enter a calorie target you have already chosen. This tool does not estimate energy needs from your age, weight, activity, or goals.
2. Choose carbohydrate, protein and fat percentages totaling 100%. A change to one percentage does not silently change another.
3. Convert each percentage to a fraction, multiply by the entered calories, then divide carbohydrate and protein calories by 4 and fat calories by 9.

Worked example: 2,000 kcal with carbohydrate 50%, protein 20%, fat 30% yields 250 g carbohydrate, 100 g protein and 66.7 g fat. The fat value is rounded for display; calculations use the unrounded amount.

The general 4/4/9 convention assigns 4 kcal/g to carbohydrate and protein and 9 kcal/g to fat. 21 CFR 101.9(c)(1) also describes other food-energy methods and specific factors for fiber and polyols. The chosen convention here is conditional planning arithmetic, not a reconstruction of every food label. Checked September 30, 2026.

A diet name does not supply a verified personal carbohydrate target. Choose percentages explicitly rather than accepting a keto, loss, gain or activity preset.

Health Canada dietary reference values give AMDRs (Acceptable Macronutrient Distribution Ranges): ages 19+ carbohydrate 45–65%, protein 10–35%, fat 20–35%; ages 4–18 protein 10–30% and fat 25–35%; ages 1–3 protein 5–20% and fat 30–40%. Carbohydrate remains 45–65% for ages 1–18. These population references do not choose a personal menu. Table updated November 19, 2025; checked September 30, 2026.

At an entered 2,000 kcal, the 45–65% carbohydrate reference corresponds to 225–325 g under the 4 kcal/g convention. This example is not a calorie recommendation.

Meal distribution is a separate arithmetic choice. For example, an entered 250 g carbohydrate budget could be divided as 75 g breakfast, 75 g lunch, 75 g dinner and 25 g snacks (30/30/30/10%). This is an example allocation, not a prescription for glucose control or exercise recovery.

Daily macro amounts alone cannot determine workout timing, food quality or the response to a particular meal. Record portions and label units consistently when building a meal list.

Not all carbohydrates are created equal. Focusing on nutrient-dense, minimally processed carbohydrate sources provides not only energy but also essential vitamins, minerals, and fiber. Here are some high-quality carbohydrate sources categorized by type:

• Whole Grains:
  • Oats (rolled, steel-cut)
  • Brown rice, wild rice
  • Quinoa, amaranth, buckwheat
  • Barley, farro, bulgur
  • 100% whole grain bread and pasta
• Starchy Vegetables:
  • Sweet potatoes, yams
  • Potatoes (all varieties)
  • Winter squash (butternut, acorn, kabocha)
  • Corn
  • Peas
• Legumes:
  • Beans (black, kidney, pinto, navy)
  • Lentils (all varieties)
  • Chickpeas
  • Soybeans and soy products
  • Split peas
• Fruits:
  • Berries (strawberries, blueberries, raspberries)
  • Apples, pears
  • Citrus fruits (oranges, grapefruit)
  • Stone fruits (peaches, plums, nectarines)
  • Bananas, melons, grapes
• Non-Starchy Vegetables:
  • Leafy greens (spinach, kale, lettuce)
  • Cruciferous vegetables (broccoli, cauliflower, Brussels sprouts)
  • Bell peppers, tomatoes, cucumbers
  • Zucchini, eggplant
  • Carrots, celery, onions
• Dairy and Alternatives:
  • Plain yogurt
  • Milk
  • Unsweetened plant-based milks

When planning your carbohydrate intake, consider these principles:

• Prioritize whole, minimally processed foods over refined options
• Include a variety of fiber-rich sources for digestive health
• Consider the glycemic impact of foods based on your specific needs
• Balance your carbohydrate choices across different food groups
• Adjust portion sizes based on your calculated carbohydrate targets

The carbohydrate Recommended Dietary Allowance is 175g/day during pregnancy and 210g/day during lactation. These life-stage population references are distinct from the entered percentage scenario. Source: Health Canada dietary reference values; checked September 30, 2026.

This form does not collect the information needed to choose a diet for childhood, pregnancy, lactation, illness, or a particular training programme. It provides neither insulin-dose advice nor an automatic lower-carbohydrate treatment plan.