Enter the total carbohydrates (g) and the total insulin (g) into the Calculator. The calculator will evaluate the Carbohydrate To Insulin Ratio. 

Carbohydrate To Insulin Ratio Formula

CIR = C / I


  • CIR is the Carbohydrate To Insulin Ratio (g/g)
  • C is the total carbohydrates (g)
  • I is the total insulin (g)

To calculate Carbohydrate To Insulin Ratio, divide the amount of carbohydrates by the total insulin.

How to Calculate Carbohydrate To Insulin Ratio?

The following steps outline how to calculate the Carbohydrate To Insulin Ratio.

  1. First, determine the total carbohydrates (g). 
  2. Next, determine the total insulin (g). 
  3. Next, gather the formula from above = CIR = C / I.
  4. Finally, calculate the Carbohydrate To Insulin Ratio.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total carbohydrates (g) = 200

total insulin (g) = 5

Frequently Asked Questions

What is the importance of calculating the Carbohydrate to Insulin Ratio (CIR)?

The Carbohydrate to Insulin Ratio is crucial for individuals with diabetes who need to manage their blood sugar levels. It helps in determining the amount of insulin required to properly metabolize the carbohydrates consumed, ensuring that blood glucose levels remain stable.

How can someone adjust their Carbohydrate to Insulin Ratio?

Adjustments to the Carbohydrate to Insulin Ratio may be necessary based on factors like activity level, stress, illness, or changes in diet. It’s important to consult with a healthcare provider to make these adjustments safely.

Are there any tools available to help with calculating the Carbohydrate to Insulin Ratio?

Yes, there are several online calculators and mobile apps designed to help individuals calculate their Carbohydrate to Insulin Ratio. These tools often provide additional features for tracking meals and insulin doses.

Why is it important to accurately measure carbohydrates when using the Carbohydrate to Insulin Ratio?

Accurate measurement of carbohydrate intake is essential when using the Carbohydrate to Insulin Ratio because it directly influences the amount of insulin required. Inaccurate measurements can lead to incorrect insulin dosing, which can result in either high or low blood glucose levels.