Drops Per Minute Calculator

Work out drops per minute instantly with clear inputs, formula shown and shareable results.

About Drops Per Minute Calculator

Converts a volume and time into a gravity drip rate for the selected giving set, and shows the equivalent pump rate.

Formula

Drops per minute

Drops/min = volume (mL) x drop factor (drops/mL) / time (minutes)

Worked example

With the default values below, Drops Per Minute Calculator returns Drops per minute of 31.3. Change any input above and every figure here is recalculated in your browser.

Inputs used

Volume to infuseaccepts 5–5,000 mL: 500 mL
Infusion timeaccepts 0.1–48 h: 4 h
Drop factorone of 10 drops/mL, 15 drops/mL, 20 drops/mL, 60 drops/mL (microdrip): 15 drops/mL

Results

Drops per minute: 31.3 drops/min
Equivalent pump rate: 125.00 mL/h
Drops per hour: 1,875

Step by step

1Values used
2Drops per minute
3Drops per minute= 31.3 drops/min
4Equivalent pump rate= 125.00 mL/h
5Drops per hour= 1,875

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

How is the rate counted in practice?

Count drops for 15 seconds and multiply by four, or use the seconds-per-drop interval for slow rates.

Does the drop factor vary by fluid?

Drop size varies slightly with viscosity, which is why blood sets use 15 drops/mL rather than 20.