Insulin Correction Dose Calculator

The Insulin Sensitivity Factor (ISF), also called the Correction Factor, is how much one unit of rapid-acting insulin will lower your blood sugar. For example, an ISF of 50 means one unit drops you by 50 mg/dL.

For rapid-acting insulin, the 1800 Rule divides 1800 by your Total Daily Dose (TDD). For regular insulin, the 1500 Rule divides 1500 by TDD. For example, a TDD of 40 units gives an ISF of 45 mg/dL per unit with rapid-acting insulin.

Insulin stacking occurs when a new correction dose is given before the previous dose has fully acted, typically within 3 to 4 hours. This can cause dangerous hypoglycemia (low blood sugar below 70 mg/dL).

Insulin on Board (IOB) is the amount of insulin still active from a previous dose. Most rapid-acting insulin has a duration of action of 4 to 5 hours, so IOB should be subtracted from new corrections.

Most adults target 100 to 120 mg/dL before meals, though targets vary. Older adults or those with hypoglycemia unawareness may have a higher target of 120 to 150 mg/dL.

Follow your doctor's protocol. Many plans only correct when blood sugar exceeds 150 mg/dL and allow at least 3 to 4 hours between corrections to account for active insulin.

Yes, the Insulin Correction Dose Calculator is fully embeddable. Tap "Embed" above to configure appearance and copy the code. It is free to use, works on any platform (HTML, WordPress, CMS), and adjusts to any screen size automatically. Visit calculory.com/services/embed-calculators for the complete guide.