IV Drip Rate Calculator (gtt/min)
Calculate the IV drip rate in drops per minute from the volume, time and tubing drop factor, plus the flow rate in mL/hour. Example: 1,000 mL over 8 hours with a 15 gtt/mL set runs at 31 drops per minute (125 mL/hour).
Show steps
How to use the IV Drip Rate Calculator (gtt/min)
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Drip rate (gtt/min) = volume (mL) x drop factor (gtt/mL) / time (minutes). Flow rate (mL/hour) = volume (mL) / time (hours).
Common IV drop factors
| Set type | Drop factor |
|---|---|
| Macrodrip | 10, 15 or 20 gtt/mL |
| Microdrip | 60 gtt/mL |
Quick drip rate examples
| Volume | Time | Set | Drops/min |
|---|---|---|---|
| 1000 mL | 8 h | 15 | 31 |
| 500 mL | 4 h | 20 | 42 |
| 250 mL | 2 h | 10 | 21 |
| 100 mL | 30 min | 60 | 200 |
| 1000 mL | 12 h | 15 | 21 |
Shortcut for a microdrip set
With a 60 gtt/mL microdrip set, the drops per minute equal the mL per hour.
Checking your work
Calculate twice, compare with the pump setting and confirm the order with a second nurse. This calculator is for education and is not medical advice. Never change or start a medicine without the advice of a pharmacist or prescriber, and always follow the label.
Frequently asked questions
How do you calculate IV drip rate?
Volume x drop factor divided by minutes.
What is a drop factor?
The number of drops that make 1 mL for a given tubing.
What is the microdrip drop factor?
60 gtt/mL.
How do I convert gtt/min to mL/hour?
Divide gtt/min by the drop factor, then multiply by 60.
Do pumps need drip rates?
No; they use mL/hour.
Is this for medication doses?
No; use a dosage calculator and your policy.
Sources
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