IV Drip Rate Calculator
Calculate IV drip rate in drops per minute (gtts/min) and mL per hour from volume, infusion time, and drop factor. Includes reverse calculator.
Use the IV Drip Rate Calculator
Infusion Parameters
Hours
Minutes
Enter infusion parameters and click Calculate
Results will appear here
Drip Rate
—
gtts / min
Infusion Rate
—
mL / hr
Total Drops
—
drops total
Rounded drip rate (manual set)
—
Round to nearest whole drop when counting manually
Calculation Breakdown
For educational and reference use. Always verify IV calculations with a second nurse and follow your institution's infusion protocols.
Known Rate Parameters
Enter a drip rate and drop factor
mL/hr (and optional time) will appear here
Infusion Rate
—
mL / hr
Infusion Time
—
hrs : min
Calculation Breakdown
For educational and reference use. Always verify IV calculations with a second nurse and follow your institution's infusion protocols.
Quick Reference — Common Drop Factors
| Drop Factor | Set Type | Typical Use | Multiplier (÷60) |
|---|---|---|---|
| 10 gtt/mL | Macro-drip | Blood, colloids, large-volume infusions | 0.1667 |
| 15 gtt/mL | Macro-drip | Standard adult infusions | 0.25 |
| 20 gtt/mL | Macro-drip | Most common adult administration set | 0.3333 |
| 60 gtt/mL | Micro-drip | Pediatric, neonatal, precise low-volume infusions | 1.0 |
Multiplier = Drop factor ÷ 60. Multiply mL/hr by this value to get drops/min directly.
Summary
This IV drip rate calculator computes the infusion rate for gravity drip sets used in clinical practice. Enter the total volume to be infused, the prescribed infusion time, and the drop factor of your administration set to get drops per minute (gtts/min), mL per hour, and total drop count. A reverse calculator is also included: enter an observed or desired drip rate plus the drop factor to find the equivalent mL/hr and estimated total infusion time for a given volume.
How it works
- Enter the total volume to infuse in millilitres (mL).
- Set the infusion time using hours and minutes fields.
- Select the drop factor (gtt/mL) printed on your administration set, or choose Custom to enter a non-standard value.
- Click Calculate to get drops per minute, mL per hour, and total drop count.
- Use the Reverse tab to work backwards from a known drip rate to mL/hr or total time.
- Round drops per minute to the nearest whole number when setting a gravity drip by hand.
Use cases
- Set a gravity IV drip accurately when an infusion pump is unavailable.
- Verify pump settings against manual drop-rate calculations as a double-check.
- Calculate pediatric or critical care infusion rates with microdrip (60 gtt/mL) sets.
- Convert a physician order written in mL/hr to drops per minute for a specific drip set.
- Teach nursing students the three-variable IV flow rate formula.
- Quickly recalculate rate after a bag change or time adjustment mid-infusion.
- Determine total infusion time when running a known volume at a given drip rate.