How to Use GIR Calculator
GIR Calculator is built to calculate glucose infusion rate in mg/kg/min from dextrose concentration, infusion rate, and patient weight. Focus first on the inputs that directly drive the calculation:
- Enter the core measurement — Enter the dextrose concentration as a percent, such as 10 for D10W.
- Check units and options — Enter the infusion rate in mL per hour from the pump setting or order.
- Read the primary result — Enter body weight in kilograms.
- Review supporting values — Review GIR, hourly glucose delivery, and infusion rate per kilogram.
Formula & Theory - GIR Calculator
GIR Calculator uses this core formula:
GIR_mg_kg_min = (glucose_percent × infusion_rate_ml_h × 10) ÷ weight_kg ÷ 60A 1% dextrose solution contains about 10 mg of glucose per mL. Multiplying concentration by mL/hour and 10 gives mg/hour, then dividing by weight and 60 converts the value to mg/kg/min.
The calculator is especially helpful because GIR can change quickly when weight is small. A small infusion-rate adjustment in a neonate may meaningfully alter glucose delivery.
Before interpreting GIR Calculator, confirm the dextrose percentage, pump rate, and weight are all taken from the same current order or patient record.
Use Cases for GIR Calculator
GIR Calculator is most useful in these situations:
- NICU dextrose infusion checks.
- Reviewing parenteral nutrition glucose delivery.
- Teaching why concentration and rate both matter.
- Comparing GIR after a pump-rate adjustment.