Insulin Dosage Calculator (USA)
Calculate insulin dosage based on carbohydrate intake and blood glucose levels. For educational purposes only.
How Insulin Dosage is Calculated
Insulin dosage is calculated using two components:
This calculation determines the total insulin needed for meal coverage and glucose correction.
- Carb Ratio: Units of insulin per gram of carbohydrates
- Correction Factor: Units of insulin to lower glucose by 1 mg/dL
- Target BG: Desired blood glucose level (typically 100-120 mg/dL)
- Current BG: Patient's current blood glucose reading
Insulin Dosage Calculator
Blood Glucose Status
Current Glucose Level
Dose Breakdown
Carbohydrate Coverage:
45g ÷ 9g/unit = 5.0 units
Correction Dose:
(180 - 100) ÷ 50 mg/dL/unit = 1.6 units
Total Insulin Dose:
5.0 + 1.6 = 6.6 units (rounded to 7 units)
This calculator provides estimates only. Always consult with your healthcare provider before adjusting insulin doses.
- Never exceed recommended doses
- Monitor for hypoglycemia
- Have glucose tablets available
- Know signs of low blood sugar
- Seek medical attention if needed
Understanding Insulin Dosing
Insulin dosing involves calculating the appropriate amount of insulin to take based on carbohydrate intake and current blood glucose levels. This helps maintain glucose levels within target ranges for people with diabetes.
Mealtime Insulin (Carb Coverage)
Calculates insulin needed to cover carbohydrates consumed. Determined by dividing total carbs by carb ratio (grams of carbs per unit of insulin).
Formula: Carbs (g) ÷ Carb Ratio (g/unit) = Mealtime Insulin
Correction Insulin
Calculates insulin needed to bring blood glucose back to target range. Determined by the difference between current and target glucose levels.
Formula: (Current BG - Target BG) ÷ Correction Factor = Correction Insulin
- Always verify your personal ratios with healthcare provider
- Never skip meals after taking mealtime insulin
- Monitor glucose frequently when adjusting doses
- Keep glucose tablets or snacks available
- Know the signs of hypoglycemia
- Have glucagon available if prescribed
- Inform others about your diabetes management
Insulin Dosing Guidelines
| Glucose Level (mg/dL) | Action | Correction Factor | Notes |
|---|---|---|---|
| <70 | Treat low blood sugar | N/A | Do not take correction insulin |
| 70-100 | Within target range | None needed | Take mealtime insulin only |
| 101-150 | Mild elevation | Calculate correction | Consider activity level |
| 151-200 | Moderate elevation | Calculate correction | May need additional insulin |
| 201-250 | Significant elevation | Calculate correction | Monitor ketones if type 1 |
| >250 | High glucose | Calculate correction | Check ketones, seek medical advice |
Insulin Dosing Quiz
Select the correct formula:
The correct answer is b) Carbs (g) ÷ Carb Ratio (g/unit). To calculate mealtime insulin, divide the total grams of carbohydrates by the carb ratio.
Memorize the correct formula for calculating mealtime insulin dose.
Calculate using the formula:
The correct answer is b) 6 units. Calculation: 60g ÷ 10g/unit = 6 units of mealtime insulin.
Practice calculating mealtime insulin doses with real values.
Select the safest action:
The correct answer is b) Treat low blood sugar immediately. When glucose is below 70 mg/dL, patients should treat hypoglycemia first, not take more insulin.
Understand the critical importance of treating hypoglycemia before taking additional insulin.
Q&A
Q: How do I determine my carb ratio and correction factor?
A: Carb ratios and correction factors are typically determined through:
Carb Ratio Determination:
- Starting with general guidelines (12-15g/unit for adults)
- Testing with consistent carb amounts
- Adjusting based on post-meal glucose readings
- Considering insulin sensitivity and timing
Correction Factor Determination:
- Using the 1500/1800 rule (1500 for rapid-acting, 1800 for regular insulin)
- Dividing by daily insulin dose
- Refining based on actual glucose responses
- Adjusting for individual variation
These should always be established and monitored by a healthcare professional.
Q: What are the signs of hypoglycemia and how should it be treated?
A: Signs of hypoglycemia include:
Early Signs:
- Sweating and shakiness
- Hunger
- Dizziness
- Palpitations
- Headache
Advanced Signs:
- Confusion
- Behavior changes
- Seizures
- Loss of consciousness
Treatment: Use the "15-15 Rule" - consume 15g of fast-acting carbs, wait 15 minutes, and recheck glucose. Repeat if needed. Keep glucose tablets or gel available.