Convert Drop to Liter
Convert drops to liters instantly. 1 drop = 5e-5 liter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Liter 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.
Liter
The liter is a metric unit of volume equal to one cubic decimeter (0.001 m³). It is the everyday metric volume unit.
Introduced in France in 1795; redefined in 1964 as exactly one cubic decimeter.
The world's common unit for beverages, fuel, and household liquids.
France, 1795; CGPM 1964.
Drop to Liter 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 liters:
To convert drops to liters, multiply the value in drops by 5e-5. To reverse, multiply liters by 20000.
How to use this converter
Type a value into the calculator. The result in liters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Liter to Drop converter for the reverse direction.
Step-by-step: convert drops to liters
- Write down the value in drops (gtt).
- Multiply that value by the factor 5e-5.
- The product is the equivalent value in liters (L).
- To reverse, multiply the liter value by 20000.
Worked examples
Example 1 — Convert 1 gtt to L:
1 × 5e-5 = 5e-5 L
Example 2 — Convert 100 gtt to L:
100 × 5e-5 = 0.005 L
Real-world example — From wavelengths to millimeter-scale objects
A value of one million drops sounds vast at the atomic scale but converts to a small everyday quantity in liters — useful when relating optical-wavelength specifications to physical mounting hardware.
1000000 gtt × 5e-5 = 50 L
Real-world example — Sub-micron to millimeter
500,000 drops converts to a small everyday quantity in liters — useful when relating optical-wavelength specifications to physical mounting hardware.
500000 gtt × 5e-5 = 25 L
Drop to Liter conversion table
Standard reference values for converting drops to liters:
| Drop [gtt] | Liter [L] |
|---|---|
| 0.01 | 5e-7 |
| 0.1 | 5e-6 |
| 1 | 5e-5 |
| 2 | 1e-4 |
| 3 | 0.00015 |
| 4 | 0.0002 |
| 5 | 0.00025 |
| 10 | 0.0005 |
| 20 | 0.001 |
| 30 | 0.0015 |
| 40 | 0.002 |
| 50 | 0.0025 |
| 100 | 0.005 |
| 500 | 0.025 |
| 1000 | 0.05 |
Frequently asked questions
How many liters is 1 drop?
How do I convert drops to liters?
How do I convert liters back to drops?
How many liters is 100 drops?
Popular volume unit conversions
Convert Drop to other volume units
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Metric / SI (3 units)
US Customary (Liquid) (1 units)
Imperial (UK) (1 units)
Cubic (length-derived) (1 units)
Sources & references
Conversion factor (1 gtt = 5e-5 L) 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.