Drops to mL Converter — Convert Drops to Millilitres
Convert a number of drops to millilitres, litres, teaspoons and tablespoons. Choose the drop type — standard aqueous liquid (20 drops/mL), IV macrodrip, IV microdrip, or essential oil — to get an accurate result.
drops
Drop type / drip set
Based on selected drop size
- 1
mL per drop
1 ÷ 20 = 0.05Volume of a single drop in millilitres for the selected drop type. - 2
Volume in mL
20 × 0.05 = 1
How does this calculator work?
Divide drops by the drop factor to get millilitres: mL = drops ÷ drops_per_mL. The standard factor is 20 drops/mL for aqueous liquids, 15 for IV macrodrip, 60 for IV microdrip, and approximately 25 for essential oils. Always check your specific dropper or infusion set for exact values.
Formula
How this is calculated
A "drop" (abbreviated gtt, from Latin gutta) is not a fixed SI unit — its volume depends on liquid viscosity, dropper tip geometry and orientation. Standardised sizes have been agreed for specific applications. The most common reference is the WHO pharmacopoeial standard for aqueous solutions: 20 drops per mL, which is used for most oral medicines and general-purpose dropper bottles.
IV infusion sets use a different standard: standard macrodrip sets deliver 15 drops per mL (some brand sets use 10 or 20), while microdrip sets deliver 60 drops per mL for more precise low-flow rates. Essential oils are typically denser and more viscous, so droppers often deliver around 25 drops per mL, though this varies by bottle tip and oil.
The conversion is simple: mL = drops ÷ drops_per_mL. The result is then expressed in litres (÷ 1000), US teaspoons (1 tsp ≈ 4.93 mL) and tablespoons (1 tbsp ≈ 14.79 mL) for additional context. Always verify the drop factor on your specific dropper or infusion set label when precision is critical.
Frequently asked questions
The pharmacopoeial standard for water and similar aqueous liquids is 20 drops per mL. So 1 mL equals 20 standard drops. Some dropper bottles may deliver slightly different volumes depending on tip design and liquid surface tension.
Standard IV macrodrip administration sets deliver 15 drops per mL (some brands use 10 or 20 — always check the label). Microdrip sets deliver 60 drops per mL for more precise flow control. The drop factor is printed on the IV tubing package and directly affects drip-rate calculations.
No. Essential oils are usually more viscous and denser than water, forming larger drops — typically around 25 drops per mL versus 20 for water. The exact figure varies by oil type and dropper tip, so treat this as a useful approximation rather than a precise measurement.
Also known as
TG we-Calculate Editorial Team. (2026). Drops to mL Converter — Convert Drops to Millilitres [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/drops-to-ml-conversion-calculator
TG we-Calculate Editorial Team. "Drops to mL Converter — Convert Drops to Millilitres." TG we-Calculate. 2026. https://we-calculate.com/calculator/drops-to-ml-conversion-calculator.
TG we-Calculate Editorial Team, "Drops to mL Converter — Convert Drops to Millilitres," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/drops-to-ml-conversion-calculator
@misc{wecalculate_drops_to_ml_conversion_calculator, title = {Drops to mL Converter — Convert Drops to Millilitres}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/drops-to-ml-conversion-calculator}}, year = {2026}, note = {TG we-Calculate} }
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