What is insulin-to-carb ratio (ICR)?

ICR indicates how many grams of carbohydrates are covered by 1 unit of rapid-acting insulin. For example, 1:10 means 1 unit covers 10g of carbohydrates.

What is insulin sensitivity factor (ISF)?

ISF (correction factor) tells you how much 1 unit of insulin will lower your blood glucose. Example: 1:50 means 1 unit lowers BG by 50 mg/dL.

What is insulin-on-board (IOB)?

IOB is active insulin still working from previous doses. Accounting for IOB prevents 'stacking' (giving additional insulin before previous dose has fully worked).

How long does rapid-acting insulin work?

Rapid-acting insulin (lispro, aspart, glulisine) typically works for 3-5 hours, with peak action at 1-2 hours after injection.

Should I round my insulin dose?

Round to your pen's smallest increment (usually 0.5 or 1 unit). Some insulin pumps can deliver in 0.05-unit increments for more precision.

Can I use this calculator without consulting a doctor?

No. This is an educational tool. Never change your insulin regimen without healthcare provider guidance. Incorrect dosing can cause dangerous hypoglycemia or hyperglycemia.

Insulin Dose Calculator

Calculate insulin doses for correction and meal coverage using your personal ratios

Critical Medical Warning

This calculator is for educational reference only. Insulin dosing is highly individual and depends on factors this calculator cannot assess. Always follow your healthcare provider's insulin regimen. Incorrect insulin dosing can cause life-threatening hypoglycemia or hyperglycemia.

Enter Your Values

Current Blood Glucose

Target Blood Glucose (mg/dL)

Carbohydrates to Eat (grams)

Meal Type

Your Personal Settings

I:C Ratio (1 unit per X carbs)

ISF/Correction (1u drops BG by)

Insulin on Board (IOB) - units still active

Understanding Your Ratios

I:C Ratio (Insulin-to-Carb)

Example: 1:10 means 1 unit of insulin covers 10 grams of carbohydrates

ISF (Insulin Sensitivity Factor)

Example: ISF of 50 means 1 unit lowers blood sugar by 50 mg/dL

IOB (Insulin on Board)

Active insulin still working from previous doses (typically lasts 3-5 hours)

About Insulin Dose Calculator - Correction & Meal Dosing

Calculate insulin doses for corrections and meals. Supports ICR, ISF, and insulin-on-board calculations.

Our **Insulin Dose Calculator** helps calculate correction and meal-time insulin doses using your insulin-to-carb ratio (ICR) and insulin sensitivity factor (ISF). It accounts for insulin-on-board (IOB) to prevent stacking. For comprehensive diabetes management, track your health with our BMI Calculator.

Accurate insulin dosing is critical for glucose management in diabetes. Our calculator breaks down each component—correction dose, meal dose, and IOB adjustment—so you understand exactly how your dose is calculated. Use our Water Intake Calculator for hydration needs.

**Critical Warning:** This calculator is an educational tool only. Insulin dosing must be individualized with your healthcare provider. Never change your insulin regimen without medical guidance. Incorrect insulin dosing can cause severe hypoglycemia or hyperglycemia.

Key Features

Correction dose calculation

Meal dose with carb counting

Insulin-on-board subtraction

Sliding scale reference

Dose breakdown explanation

Safety warnings

Why Use This Tool?

Accurate dose calculation

Prevent insulin stacking

Understand dosing components

Support diabetes education

Quick mealtime calculations

Common Use Cases

Meal Dosing: Calculate rapid-acting insulin for meals.

Correction Doses: Determine how much insulin to correct high glucose.

Diabetes Education: Understand insulin dosing principles.

Pump Settings: Verify pump bolus calculations.

Technical Information

Correction dose = (Current BG - Target BG) / ISF
Meal dose = Carbohydrates / ICR
Total dose = Correction + Meal - IOB
IOB = active insulin from recent boluses

How to Use

Enter current blood glucose

Enter target glucose

Input insulin sensitivity factor

Enter carbs and insulin-to-carb ratio

Account for insulin-on-board

View calculated dose