Insulin Correction Dose Calculator
Calculate how much rapid-acting insulin is needed to bring high blood sugar back to a target range.
Enter Values
Result
Enter values above and click Calculate to see your result.
AI Assistant
Ask about this calculator
I can help you understand the insulin correction dose calculator formula, interpret your results, and answer follow-up questions.
Try asking
Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.
Formula
Determines the units of insulin required based on your individual Insulin Sensitivity Factor (ISF).
Worked Example
How Insulin Correction Doses Work
- Formula: Correction Dose = (Current Blood Sugar - Target) / Insulin Sensitivity Factor
- The 1800 Rule estimates ISF for rapid-acting insulin: ISF = 1800 / Total Daily Dose
- The 1500 Rule estimates ISF for regular insulin: ISF = 1500 / Total Daily Dose
- Wait at least 3 to 4 hours between correction doses to avoid insulin stacking
- Typical ISF range: 25 to 75 mg/dL per unit, depending on insulin resistance
This tool provides estimates only. Always follow your prescriber's individualized dosing instructions and consult before making changes.
You can also calculate changes using our Carbohydrate Ratio Calculator or HbA1c to eAG Calculator.
Frequently Asked Questions
What is the Insulin Sensitivity Factor?
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.
How is ISF estimated?
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.
What is insulin stacking?
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).
What is Insulin on Board?
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.
What is a typical target blood sugar?
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.
Should I correct every high reading?
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.
Medical Disclaimer
This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.
AI Assistant
Ask about this calculator
I can help you understand the insulin correction dose calculator formula, interpret your results, and answer follow-up questions.
Try asking
Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.
Related Calculators
Secure and Private
All calculations run locally. Your data never leaves your browser.
Precise Calculations Powered by Calculory AI