IV Drip Rate
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Total volume (ml)
Drop factor (gtt)
Number of hours
R e s u l t s
IV Drip Rate (gtt/min)
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IV Drip Rate

IV Drip Rate = Total Volume (ml) x Drop Factor (gtt) x Number of Hours

To calculate the drip rate for an intravenous infusion, 3 values are needed:

  1. The amount of solution and corresponding time for infusion. May be ordered as:
    • 1000 ml over 8 hr
      or
    • 125 ml/hr
  2. The equivalent in time to convert hours to minutes.
    • 1 hr = 60 min
  3. The drop factor or number of drops that equal 1 ml of fluid. (This information can found on the IV tubing box.)
    • 10 gtt = 1 ml