Which formula correctly calculates drip rate?

• A. Dose x gtt factor / solution concentration = drip rate
• B. Drip rate = (Dose x gtt factor) / solution concentration
• C. Drip rate = solution concentration / (Dose x gtt factor)
• D. Drip rate = (Dose / gtt factor) x solution concentration

Answer: (B)

The calculation relies on converting the required amount to deliver into a volume to infuse, then turning that volume into drops using the drop factor. If you divide the dose by the solution concentration, you get the volume to infuse in milliliters. Multiplying that volume by the drop factor (drops per milliliter) gives the number of drops. So the formula Drip rate = (Dose × gtt factor) / concentration follows the correct sequence: convert dose to volume, then convert volume to drops. It’s simply two steps in one compact expression, and it’s equivalent to (Dose / concentration) × gtt factor, just written with the multiplication bundled with the dose. These units line up to yield drops per minute when time is accounted.