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Insulin-to-Carb Ratio Calculator

Enter your total daily insulin dose to estimate your insulin-to-carb ratio.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

The insulin-to-carb ratio (ICR) tells a person with diabetes how many grams of carbohydrate one unit of rapid-acting insulin will cover, and it is commonly estimated with the “500 rule”: divide 500 by the total daily insulin dose (TDD), including both basal and bolus insulin. A TDD of 50 units, for example, gives an estimated ratio of 1 unit per 10 grams of carbohydrate.

People with type 1 diabetes and their endocrinologists use this ratio as a starting point for carbohydrate counting at meals, adjusting the dose up or down based on real-world blood glucose response. This calculator applies the 500 rule to your entered total daily insulin dose, though it is not medical advice and any dosing changes should be confirmed with a healthcare provider.

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