Insulin Dose Calculator
Meal bolus and correction dose.
Enter your values
Enter the meal carbs in g.
Enter the insulin to carb ratio (1 unit per g) you are working with.
Enter the current glucose in mg/dL.
Enter the target glucose in mg/dL.
Enter the correction factor in mg/dL per unit.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Total suggested dose
- 6.4 units
- Meal bolus
- 5 units
- Correction dose
- 1.4 units
- Glucose above target
- 70 mg/dL
Quick answer
A meal bolus is carbs divided by your insulin-to-carb ratio, plus a correction based on your sensitivity factor.
Dose = Carbs/ICR + (Glucose − Target)/ISF
At a glance
| What it does | Meal bolus and correction dose. |
|---|---|
| Category | Health |
| Inputs needed | Meal carbs, Insulin to carb ratio (1 unit per g), Current glucose, Target glucose, Correction factor |
| Main output | Total suggested dose |
| Formula | Dose = Carbs/ICR + (Glucose − Target)/ISF |
| Cost | Free — no sign-up, no download |
How to use the Insulin Dose Calculator
- 1Enter the carbohydrate grams in your meal.
- 2Enter your insulin-to-carb ratio and correction factor.
- 3Always confirm with your care team.
Inputs explained
- Meal carbs(g)
- Enter the meal carbs in g.
- Insulin to carb ratio (1 unit per g)
- Enter the insulin to carb ratio (1 unit per g) you are working with.
- Current glucose(mg/dL)
- Enter the current glucose in mg/dL.
- Target glucose(mg/dL)
- Enter the target glucose in mg/dL.
- Correction factor(mg/dL per unit)
- Enter the correction factor in mg/dL per unit.
Worked example
Using the values the calculator loads with:
Inputs
- Meal carbs60 g
- Insulin to carb ratio (1 unit per g)12
- Current glucose180 mg/dL
- Target glucose110 mg/dL
- Correction factor50 mg/dL per unit
Results
- Total suggested dose6.4 units
- Meal bolus5 units
- Correction dose1.4 units
- Glucose above target70 mg/dL
Frequently asked questions
Is this medical advice?
No — it is an arithmetic aid. Follow the plan your clinician set.
What about insulin on board?
This tool does not subtract active insulin; a pump bolus wizard does.
What do I need to enter into the Insulin Dose Calculator?
Just 5 values: meal carbs, insulin to carb ratio (1 unit per g), current glucose, target glucose, correction factor. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Insulin Dose Calculator work out the answer?
A meal bolus is carbs divided by your insulin-to-carb ratio, plus a correction based on your sensitivity factor. It applies the formula Dose = Carbs/ICR + (Glucose − Target)/ISF and shows the working so you can check each step by hand.
Is the Insulin Dose Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.