Essential Oil Converter
Convert between essential oil drops, milliliters, and dilution percentages.
Calculate safe dilution ratios for carrier oils.
Enter drops or milliliters to convert, or calculate a safe dilution blend.
Understanding Essential Oil Measurements
Essential oils are highly concentrated plant extracts that must be properly diluted before topical application. Accurate measurement is critical for safety and effectiveness. The standard measurement unit for essential oils is drops, but professional aromatherapists and formulators work in milliliters for greater precision. Understanding the relationship between drops, milliliters, and dilution percentages ensures safe and consistent blending.
Drops to Milliliters Conversion:
The number of drops per milliliter varies by the viscosity of the oil and the dropper size, but the widely accepted standard is:
1 mL = approximately 20 drops
1 drop = approximately 0.05 mL
For thicker oils (like vetiver or myrrh), there may be 15-18 drops per mL. For thinner oils (like lemon or eucalyptus), there may be 22-25 drops per mL.
Standard Bottle Sizes:
| Bottle Size | Milliliters | Approximate Drops |
|---|---|---|
| 5 mL | 5 | 100 drops |
| 10 mL | 10 | 200 drops |
| 15 mL (1/2 oz) | 15 | 300 drops |
| 30 mL (1 oz) | 30 | 600 drops |
| 100 mL | 100 | 2,000 drops |
Dilution Percentage Formula:
Dilution % = (drops of essential oil / total drops of blend) × 100
Or more practically:
Drops of essential oil = (desired % × carrier oil in mL × 20) / 100
Safe Dilution Guidelines:
| Dilution | Drops per oz Carrier | Drops per tsp Carrier | Recommended For |
|---|---|---|---|
| 0.5% | 3 drops per oz | 0.5 drop per tsp | Infants, elderly, sensitive skin |
| 1% | 6 drops per oz | 1 drop per tsp | Children ages 2-6, facial blends |
| 2% | 12 drops per oz | 2 drops per tsp | Standard adult daily use |
| 3% | 18 drops per oz | 3 drops per tsp | Short-term therapeutic use |
| 5% | 30 drops per oz | 5 drops per tsp | Acute conditions, limited area |
| 10% | 60 drops per oz | 10 drops per tsp | Very short-term, small area only |
Carrier Oil Volumes:
- 1 teaspoon = 5 mL = approximately 100 drops of carrier oil
- 1 tablespoon = 15 mL = approximately 300 drops of carrier oil
- 1 fluid ounce = 30 mL = approximately 600 drops of carrier oil
Practical Examples:
- To make a 2% dilution massage oil: add 12 drops of essential oil to 1 oz (30 mL) of carrier oil such as sweet almond or jojoba.
- A roller bottle (10 mL) at 3% dilution needs 6 drops of essential oil, topped off with carrier oil.
- A 4 oz (120 mL) body lotion at 1% dilution requires 24 drops of essential oil total.
Tips:
- Always perform a patch test on a small area of skin before using a new essential oil blend.
- Never apply undiluted essential oils directly to skin except under professional guidance.
- Some essential oils (citrus oils like lemon, bergamot, and grapefruit) are phototoxic and can cause skin burns in sunlight. Use at 0.5-2% maximum for sun-exposed skin.
- Store essential oils in dark glass bottles away from heat and sunlight to preserve potency. Most oils last 1-3 years when properly stored.