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Feb 11, 2026
Volume
1.00 mL
Teaspoons
0.20 tsp
Fluid Ounces
0.034 oz
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View detailed breakdowns and explanations below.
📘 What is a Drop (gtt)?
Medical Standard: 20 drops = 1 mL
Micro Drip: 60 drops = 1 mL
Micro Drip: 60 drops = 1 mL
The abbreviation gtt comes from the Latin word guttae, meaning drops. In modern pharmacology, a standard dropper is often calibrated so that 20 drops equal 1 milliliter. However, different liquids behave differently due to surface tension.
🧠 IV Tubing Factors
Nurses use "Drop Factors" to calculate IV flow rates. The physical tubing determines the drop size:
- Macro Drip (10-20 gtt/mL): Used for rapid fluid replacement or thick blood products. Big drops.
- Micro Drip (60 gtt/mL): Used for precise medication delivery or pediatrics. Small drops.
✍️ Worked Example
Scenario: You need to add 0.5 mL of essential oil to a diffuser.
Factor: Essential oils are thin, approx 25 drops/mL.
Calculation: 0.5 mL × 25 = 12.5 drops.
Result: Add roughly 12-13 drops.
📊 Real-World Applications
- Nursing: Manually setting IV drip rates (drops per minute).
- Eye Drops: Most eye drop bottles dispense about 0.05 mL per drop (20 drops/mL).
- Cooking: "Add a few drops of hot sauce" usually implies about 0.5 to 1 mL.
✅ Key Takeaways
- The pharmaceutical standard is typically 20 drops per mL.
- For precise medical conversions, ALWAYS check the tubing packaging (drop factor).
- 1 Teaspoon contains roughly 100 drops (approx 5 mL).
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