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Free Diabetes Tool
Carbs & Insulin
Dose Calculator
Enter your meal carbs, blood sugar and personal settings to instantly calculate the exact insulin dose you need.
Your settings
Blood sugar unit
Meal carbohydrates
grams in this meal
g
Carb-to-insulin ratio (ICR)
set by your doctor
g/u
Current blood sugar
right now
mg/dL
Target blood sugar
your goal
mg/dL
Correction factor (ISF)
1 unit lowers BG by…
mg/dL
Fill in your details on the left
and press Calculate to see your dose.
Total insulin dose
—
units of insulin
Meal dose
—
units
Correction
—
units
For informational use only. Confirm with your doctor.
Step by step
How to use this calculator
Choose your unit
Select mg/dL or mmol/L. The calculator converts all values automatically.
Enter meal carbs
Count total grams of carbohydrates in your meal using food labels or a carb guide.
Enter your ratios
Add your ICR, ISF, current blood sugar and target — all prescribed by your doctor.
Get your dose
Press Calculate. Review meal dose, correction and total. Always verify with your care team.
The formula
How the dose is calculated
This calculator uses the two standard formulas recommended by diabetes care teams worldwide:
Dose formulas
Meal dose = Carbs (g) ÷ ICR
Correction = (Current BG − Target) ÷ ISF
Total = Meal dose + Correction
Reference
Blood sugar ranges
| Level | mg/dL | mmol/L | Status |
|---|---|---|---|
| 70 – 99 | 3.9 – 5.5 | Normal | |
| < 140 | < 7.8 | Normal | |
| 100 – 125 | 5.6 – 6.9 | Pre-diabetic | |
| ≥ 126 | ≥ 7.0 | Diabetic range | |
| < 70 | < 3.9 | Act now |
FAQ
Frequently asked questions
Divide the total grams of carbohydrates by your ICR. Example: 60g ÷ ICR 15 = 4 units of meal insulin. This calculator does it instantly and adds any correction dose needed.
Extra insulin to bring high blood sugar back to target. Formula: (Current BG − Target) ÷ ISF. If you are already at target, the correction dose is zero.
The ICR tells you how many grams of carbs one unit of insulin covers. ICR 15 = 1 unit covers 15g. It is set by your doctor and may differ at different times of day.
The ISF tells you how much one unit of insulin lowers your blood sugar. ISF 50 mg/dL = 1 unit drops BG by 50. It is specific to you and set by your diabetes care team.
No. Below 70 mg/dL (3.9 mmol/L) treat hypoglycemia immediately with fast-acting carbs. Do NOT take insulin. The calculator will show a critical danger alert if you enter a low blood sugar.
Primarily designed for type 1 or insulin-dependent type 2 diabetes on basal-bolus therapy. If you use fixed doses or oral medication only, this calculator does not apply.
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