Glucose Infusion Rate (GIR) Calculator

Glucose Infusion Rate (GIR) Calculator for Endocrinology. The result is a delivery rate, not a diagnosis of hyperinsulinism or a recommended target. The international hyperinsulinism guideline places glucose requirements in a specific diagnostic and treatment context; high requirements can occur and need specialist assessment.

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

Glucose infusion rate in mg/kg/min = dextrose percentage x mL/hour / (6 x weight in kg). One percent represents 1 g per 100 mL, or 10 mg/mL; dividing hourly delivery by 60 and by weight gives the factor of 6. Only the specified continuous infusion is counted.

When to use this calculator

Use to check glucose delivery from a continuous infusion or compare prescribed infusions on a weight-normalized basis. Clinical interpretation depends on age, disease and measured glucose. Persistent hypoglycemia requires assessment rather than simply comparison with a generic range.

Inputs used

  • Weight in kg or lb
  • Continuous infusion rate in mL/hour
  • Dextrose concentration as percent grams per 100 mL

Clinical interpretation

The result is a delivery rate, not a diagnosis of hyperinsulinism or a recommended target. The international hyperinsulinism guideline places glucose requirements in a specific diagnostic and treatment context; high requirements can occur and need specialist assessment.

Worked example

Dextrose 12.5% at 10 mL/hour in a 3 kg patient gives 12.5 x 10 / 18 = 6.944 mg/kg/min. A stopped infusion at zero mL/hour gives zero. Dextrose 10% at 54 mL/hour for 3 kg gives 30 mg/kg/min; the tool does not impose a universal GIR ceiling.

Limitations and safety notes

Enteral carbohydrate, other infusions and endogenous glucose production are excluded. Weight must be positive. A bolus cannot be converted to mg/kg/min without its delivery duration. Concentration and vascular-access safety are separate checks; this calculator does not approve a preparation, route or maximum infusion rate.

Frequently asked questions

Is a high GIR always unsafe?

The number alone cannot establish safety or a diagnosis. Requirements, access, fluid balance and glucose response must be assessed in context.

Can I include a dextrose bolus?

Not as a continuous hourly rate without defining its delivery time. This tool evaluates the specified continuous infusion only.

References

  • International Guidelines for the Diagnosis and Management of Hyperinsulinism, published 2024; high glucose requirements can occur and are not a universal GIR ceiling. https://pubmed.ncbi.nlm.nih.gov/37454648/

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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