Updated October 11, 2026 · Free calculator
Carb Counting Calculator for Diabetes
Add the total carbohydrate per serving from each food label, then enter the number of servings you plan to eat.
Add up your meal
The starting values are examples. Replace them with your own label or food reference values.
Total meal carbohydrate
37.5 g
How the calculator works
For each food: total carbohydrate per serving × servings eaten. Add the results for the whole meal. For example, 30 g × 1 serving plus 15 g × half a serving equals 37.5 g.
Check the label's serving size and total carbohydrate, rather than only its sugar line. If you eat twice the labeled serving, enter 2 servings. This calculator does not subtract fiber or sugar alcohols.
Food labels and portions are estimates. This total does not predict your glucose response or calculate an insulin dose. Follow your care team's plan.
Read the step-by-step carb counting guideSource: CDC: Carb Counting. Updated by the GluKee team; this tool has not been independently clinically reviewed.