Insulin Dose Calculator

The Correction Factor (also called Insulin Sensitivity Factor or ISF) is how many mg/dL one unit of rapid-acting insulin will lower your blood sugar. It is estimated by dividing 1800 by your Total Daily Dose (TDD). For example, TDD of 36 units gives a correction factor of 50.

The Carb Ratio (ICR) is the number of grams of carbohydrates covered by one unit of insulin. It is estimated by dividing 500 by your TDD. A TDD of 50 gives a ratio of 1:10, meaning 1 unit covers 10 grams of carbs.

This logic applies to rapid-acting insulin analogs (lispro, aspart, glulisine) and regular insulin used for mealtime boluses. It does not apply to long-acting basal insulin like glargine or detemir.

Most adults with Type 1 diabetes use 0.5 to 1.0 units per kilogram of body weight per day. For a 70 kg person, that is 35 to 70 units total, split between basal and bolus doses.

Wait at least 3 to 4 hours between correction doses. Rapid-acting insulin remains active for 4 to 5 hours, and giving additional doses too soon can cause dangerous hypoglycemia (blood sugar below 70 mg/dL).

Yes. If your current blood sugar equals your target, the correction component is zero. You would only dose for carb coverage in that case.

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