How much fragrance oil belongs in a candle cannot be answered with a single universal percentage.
The suitable amount of fragrance depends, among other things, on the specific wax, the fragrance composition, the wick, the vessel, and the desired scent throw. Even professional wax manufacturers provide different processing instructions and fragrance amounts depending on the wax type. For example, Cargill recommends different loads and processing conditions for certain NatureWax applications than for other wax types.
The technically reasonable amount of fragrance should therefore always be cross-referenced with the specific wax manufacturer's specifications and the product-specific fragrance documentation.
A higher amount of fragrance oil does not automatically mean a stronger hot throw.
How is fragrance oil for candles calculated?
For candles, the amount of fragrance is usually related to the amount of wax used.
Formula:
Fragrance Amount = Wax Amount × Dosage (%) ÷ 100
Example
500 g wax
8 % fragrance
500 × 8 ÷ 100 = 40 g fragrance
For this test batch, therefore, 40 g of fragrance would be used for 500 g of wax.
Calculation table for candles
The following table is exclusively a calculation aid.
It does not mean that every one of these concentrations is recommended or permissible for every wax or every fragrance.
| Wax amount | 6 % | 8 % | 10 % |
|---|---|---|---|
| 100 g | 6 g | 8 g | 10 g |
| 200 g | 12 g | 16 g | 20 g |
| 250 g | 15 g | 20 g | 25 g |
| 500 g | 30 g | 40 g | 50 g |
| 1,000 g | 60 g | 80 g | 100 g |
| 5,000 g | 300 g | 400 g | 500 g |
Is there a general maximum for soy wax?
No.
A statement such as:
"Soy wax tolerates a maximum of 12% fragrance oil"
is too general.
Even within a single wax family, different products can vary significantly. A technical data sheet from Cargill, for example, states 6% as the recommended maximum fragrance amount for one NatureWax type, while higher loads are only described under additional conditions. Other Cargill documents, in turn, mention different typical ranges.
Therefore, the following applies:
It is not "soy wax" or "rapeseed wax" alone that determines the maximum fragrance amount, but the specific wax product.
The same applies to:
- Rapeseed wax
- Coconut wax
- Paraffin
- Soy blends
- Rapeseed blends.
When is fragrance oil added to the wax?
The optimal addition temperature is also not identical for all waxes.
Cargill, for example, often states a range of about 73–85 °C for its NatureWax systems, but explicitly points out that the suitable temperature depends on the specific wax type. Individual technical data sheets, in turn, specify their own processing temperatures.
Therefore, it should not be stated generically on every candle recipe:
"Always stir in fragrance oil at 70–85 °C."
Better is:
Professional Procedure
- Check the technical data sheet of the wax used.
- Melt wax according to manufacturer's recommendation.
- Weigh fragrance precisely.
- Add fragrance at the temperature suitable for this wax system.
- Incorporate carefully and evenly.
- Pour candle under controlled conditions.
- Test after suitable cure time.
Why more fragrance oil does not automatically mean more fragrance
The scent performance of a candle results from an overall system.
Relevant factors are:
- Fragrance composition
- Fragrance concentration
- Wax
- Wick
- Vessel diameter
- Melt pool
- Temperature
- Cure time
- Air movement in the room.
Too high fragrance amounts can lead to problems such as separation or altered burning behavior in some wax systems. Cargill also points out that the amount of fragrance and the wick must be matched to the burning system.
Therefore, a technically well-matched candle with, for example, 8% fragrance can have a better hot throw than a poorly matched candle with 10%.
Cold Throw and Hot Throw
Cold Throw
Cold Throw describes the scent of the cold, unlit candle.
Hot Throw
Hot Throw refers to the scent effect during burning.
A good cold throw does not guarantee a good hot throw.
When burning, the following particularly influence:
- Temperature
- Wick
- Melt pool
- Wax
the release of the fragrance components.
You can find more information on this in the Aroma-Nova article "Cold Throw & Hot Throw in Scented Candles". The current specialist page already explains these factors separately.
What influence does the wick have?
The wick is an essential part of the recipe.
Its dimensioning influences:
- Flame height
- Heat input
- Melt pool
- Burn rate.
Wax manufacturers therefore name, among other things, wax type, vessel, and fragrance load as factors for wick selection.
After a significant change in the amount of fragrance, the wick should therefore also be re-tested.
Professional Scented Candle Test
For a new fragrance, it is advisable to make several small test candles.
For example, if the wax used and the product-specific requirements allow, different fragrance concentrations can be compared.
All other factors should remain as constant as possible.
| Test Criterion | Test A | Test B | Test C |
|---|---|---|---|
| Fragrance Concentration | |||
| Surface | |||
| Cold Throw | |||
| Hot Throw | |||
| Flame Height | |||
| Melt Pool | |||
| Soot Formation | |||
| Container Temperature | |||
| Burn Time |
This makes it possible to determine whether a higher concentration actually brings an advantage.
IFRA and Scented Candles
IFRA Standards establish prohibitions, restrictions, or specifications for certain fragrance ingredients. Quantitative IFRA limits refer to the concentration of the respective fragrance ingredient in the finished consumer product, not simply to a blanket percentage for "fragrance oil".
The product-specific IFRA Certificate should therefore be considered when developing a final product.
However, an IFRA Certificate does not replace a complete safety assessment or legal requirements. IFRA explicitly points this out.
FAQ
How much fragrance oil goes into a candle?
There is no universal value. The appropriate concentration depends on the specific wax and fragrance, as well as the results of the burn test.
Is 10% fragrance oil always possible?
No. The permissible and technically sensible range depends on the specific wax and the fragrance documentation.
When is fragrance oil added?
At the recommended processing temperature for the specific wax system.
Why does my candle smell strong cold, but weak when burning?
Possible causes include the wick, melt pool, wax, and fragrance concentration.
Does a new recipe need to be burned?
Yes. Scent performance and burning safety cannot be judged solely by the cold candle.
Conclusion
The optimal amount of fragrance oil for a candle is not a fixed standard value.
The professional procedure is:
Check wax manufacturer → check fragrance documentation → select test concentration → make candle → perform complete burn test → optimize recipe.
Expertly reviewed: Aroma Nova Product Development
Status: August 2026
Expert sources
Cargill NatureWax – Processing, fragrance loading and wick selection.
International Fragrance Association – IFRA Standards and application of Certificates of Conformity.
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