Convert Drop to Milliliter
Convert drops to milliliters instantly. 1 drop = 0.05 milliliter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Milliliter to Drop converter for the reverse conversion.
Units explained
Drop
A drop is a nominal small volume of about 0.05 mL; the exact size varies with the liquid and dropper.
Standardized loosely in pharmacy as roughly 1/20 of a milliliter (the metric drop).
Used for liquid medication and flavor dosing; treat as approximate.
Pharmacy convention.
Milliliter
A milliliter is one thousandth of a liter, exactly equal to one cubic centimeter.
Formed with the SI prefix milli- applied to the liter.
The standard small-volume unit in cooking, medicine and the laboratory.
Metric prefix system.
Drop to Milliliter conversion formula
Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.
The relationship between drops and milliliters:
To convert drops to milliliters, multiply the value in drops by 0.05. To reverse, multiply milliliters by 20.
How to use this converter
Type a value into the calculator. The result in milliliters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Milliliter to Drop converter for the reverse direction.
Step-by-step: convert drops to milliliters
- Write down the value in drops (gtt).
- Multiply that value by the factor 0.05.
- The product is the equivalent value in milliliters (mL).
- To reverse, multiply the milliliter value by 20.
Worked examples
Example 1 — Convert 1 gtt to mL:
1 × 0.05 = 0.05 mL
Example 2 — Convert 100 gtt to mL:
100 × 0.05 = 5 mL
Real-world example — Spanning sub-micron to micron scale
Crossing from drops to milliliters is the everyday workflow of microscopy and semiconductor engineering — a measurement of 1000 drops translates to a much more compact value in milliliters that fits the scale of biological cells and process nodes.
1000 gtt × 0.05 = 50 mL
Real-world example — Sub-visible-light wavelength
500 drops (the green-yellow visible band) equals 0.5 milliliters — the canonical conversion in optics between wavelength specifications and micron-scale lens-coating thicknesses.
500 gtt × 0.05 = 25 mL
Drop to Milliliter conversion table
Standard reference values for converting drops to milliliters:
| Drop [gtt] | Milliliter [mL] |
|---|---|
| 0.01 | 0.0005 |
| 0.1 | 0.005 |
| 1 | 0.05 |
| 2 | 0.1 |
| 3 | 0.15 |
| 4 | 0.2 |
| 5 | 0.25 |
| 10 | 0.5 |
| 20 | 1 |
| 30 | 1.5 |
| 40 | 2 |
| 50 | 2.5 |
| 100 | 5 |
| 500 | 25 |
| 1000 | 50 |
Frequently asked questions
How many milliliters is 1 drop?
How do I convert drops to milliliters?
How do I convert milliliters back to drops?
How many milliliters is 100 drops?
Popular volume unit conversions
Convert Drop to other volume units
Show all Drop conversions
Metric / SI (3 units)
US Customary (Liquid) (1 units)
Imperial (UK) (1 units)
Cubic (length-derived) (1 units)
Sources & references
Conversion factor (1 gtt = 0.05 mL) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.