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Infusion Rate (mL/hr) Formula:

Infusion Rate (mL/hr) = Total Volume (mL) ÷ Time (hours)

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Example 1:

You need to give 1000 mL over 8 hours:

= 1000 mL ÷ 8 hr = 125 mL/hr

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Example 2:

Doctor orders 500 mL to be given over 4 hours:

= 500 ÷ 4 = 125 mL/hr

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IV Medication with Dose (Optional):

If the medication is based on a drug dose (e.g., mg/hr), you’ll need:

Infusion Rate (mL/hr) = (Dose per hour × Volume of fluid) ÷ Total drug in fluid