Insulin Guru

Patient Details 🙋

Select Patient:

Patient Name:

Insulin to Carbohydrate Ratio:

The Insulin to Carbohydrate Ratio is the amount of insulin needed for a given amount of carbs. For example, if it’s "1 in 10," it means 1 unit of insulin for every 10g of carbs.

1 in

Correction Ratio:

The Correction Ratio is the amount insulin needed to reduce the blood glucose level by the given amount. For example, if it’s "1 in 8," it means 1 unit of insulin will correct the glucose level by 8 mmol/L.

1 in

Target Blood Glucose Level (mmol/L):

The Target Blood Glucose Level is your ideal blood glucose level given to you by a healthcare professional. By using this and the correction ratio above we can calculate how much extra insulin is required to bring you down from a high blood glucose level to this ideal baseline. If the current blood glucose level is close to or below the target blood glucose level, no correction will be required.

Meal Details 🍽️

Meal Type:

Optional. The Meal Type choice allows you to categorise the type of meal eaten in the History table.

Time:

Optional. The date and time of the meal, for reference in the History table.

Current Blood Glucose (mmol/L):

Carbs in Meal (g):

About Insulin Guru

Insulin Guru is a simple, easy-to-use tool designed to help people with diabetes estimate their mealtime and correction insulin doses. It provides a clear and structured way to calculate insulin needs based on carbohydrate intake and blood glucose levels.

Who is this website for?

This tool is designed for individuals who manage their insulin levels, whether for themselves, a family member, or a caregiver. It is particularly helpful for those using rapid-acting insulin and wanting a quick way to determine their required dose.

Features

Quickly calculate your estimated insulin dose without needing to manually work through formulas.
Save patient details and view past calculations to track trends over time.
Understand exactly how your insulin dose is calculated.

How are the insulin values calculated?

Insulin Guru calculates two different types of insulin requirements:

1. Insulin for Carbohydrates (Meal Insulin)

This is determined using your Insulin-to-Carbohydrate Ratio (ICR), which tells you how many grams of carbohydrates one unit of insulin will cover. The formula is:

Insulin for Carbs = (Total Carbs Eaten) / (Carb Ratio)

The result is then rounded to the nearest 0.5 unit.

2. Insulin for Correction (High Blood Sugar Correction)

If your blood glucose is above your target level, extra insulin may be needed to bring it down. This is calculated using the Correction Factor (Sensitivity Factor), which tells you how much one unit of insulin lowers your blood sugar. The formula is:

Insulin for Correction = (Current Blood Glucose - Target Glucose) / Correction Ratio

The result is rounded down to the nearest 0.5 unit to ensure there's no accidental over-correction. No correction is applied if blood glucose is at or below the target.

Finally, these two values are added together to give the total insulin dose.

Important Disclaimer

This tool is meant for informational purposes only and should not be used as a replacement for professional medical advice. Always consult with your doctor or healthcare provider before making any insulin adjustments. The creator of this website is not responsible for any medical decisions made based on these calculations.