Essential Oil Dilution Chart and Calculator
Every safe topical use of essential oils starts with the same question: how many drops in how much carrier? Here is the calculator, the full chart, and the reasoning behind each dilution level, so you never have to guess again.
Interactive Dilution Calculator
Based on the standard aromatherapy convention of about 20 drops per ml of essential oil. Dropper sizes vary, so treat results as a guide, not a lab measurement.
The Full Dilution Chart
| Dilution | Drops per 30 ml (1 oz) | Drops per 10 ml | Best for |
|---|---|---|---|
| 0.5% | 3 | 1 | Sensitive skin, elderly users, long daily exposure |
| 1% | 6 | 2 | Face, daily leave-on blends, larger body areas |
| 2% | 12 | 4 | The standard adult body blend: massage oils, moisturizers |
| 3% | 18 | 6 | Targeted short-term use: a sore shoulder, a specific spot |
| 5% | 30 | 10 | Acute, small-area, short-duration use only |
Two caveats the chart cannot capture. First, some oils have their own, much lower dermal maximums regardless of the general chart: cinnamon bark, clove, lemongrass, and oregano are the classic examples, and citrus oils add photosensitivity on top (no sun on treated skin for 12+ hours). Second, children are not small adults: for kids the safe range starts lower and some oils are off the table entirely, so read our safety basics guide before blending for anyone under 12.
Choosing the Carrier
The carrier does more than dilute. Fractionated coconut oil is the neutral default: odorless, non-greasy, long shelf life. Sweet almond suits massage, jojoba mimics skin sebum for facial blends, and castor is the heavy conditioner for hair and brows. Our carrier oil comparison breaks down when to use which.
How to Mix a 2% Blend, Step by Step
Frequently Asked Questions
At the standard 2% adult dilution, 12 drops per fl oz (30 ml). For 1% use 6 drops, for 3% use 18 drops. The convention assumes roughly 20 drops per ml, though dropper sizes vary slightly.
It is a blending guideline for scent design, not safety: build a blend from roughly 30% top notes (citrus, mints), 50% middle notes (florals, herbs), and 20% base notes (woods, resins) so the aroma stays balanced as it evaporates. Dilution percentages for skin safety are a separate calculation.
1% or lower, which means about 6 drops per 30 ml of carrier. Facial skin is thinner and more reactive than body skin, and some oils (citrus especially) should be avoided in daytime facial blends due to photosensitivity.
As a rule, no. Undiluted application risks irritation and sensitization, an immune response that can become permanent. The narrow exceptions, like a single drop of tea tree on a blemish, should stay occasional and never spread to larger areas.
For a 2% dilution, 4 drops topped up with carrier. For a 1% facial roller, 2 drops. For a 3% targeted roller, 6 drops.