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Insulin Dosage Calculator

Health & Fitness

Calculate a mealtime insulin dose using the standard carbohydrate-ratio and correction-factor method, plus the 500 and 1800 rules for estimating those ratios from total daily insulin dose.

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g
0 g300 g
g/unit
1 g/unit50 g/unit
mg/dL
40 mg/dL600 mg/dL
mg/dL
60 mg/dL200 mg/dL
mg/dL per unit
5 mg/dL per unit150 mg/dL per unit

Total Mealtime Dose

6.5

The carb coverage and correction doses combined.

Carb Coverage Dose

5.0

Insulin needed to cover the carbohydrates in this meal.

Correction Dose

1.5

Extra insulin needed to bring blood glucose down to target, if above target.

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Calculator Stats

Odeh Ahwal

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Odeh Ahwal
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Frequently Asked Questions

What are the 500 and 1800 rules?

These are common starting-point estimates: dividing 500 by total daily insulin dose gives an estimated carbohydrate ratio, and dividing 1800 by total daily insulin dose gives an estimated insulin sensitivity factor. A prescriber individualizes both from there.

Is this a substitute for medical advice?

Insulin dosing errors can cause severe, immediate harm. This tool is for education only. Never adjust a real insulin dose without your prescribing clinician.

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