What Is Fragrance Load in Candle Making?
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Fragrance load describes how much fragrance mixture is added to a candle formulation, expressed as a percentage of a stated mass. In the wax-based convention used by many candle suppliers, it is the fragrance oil’s mass divided by the wax’s mass, multiplied by 100. A percentage of the complete mixture uses a different denominator. Always establish which basis the number describes.
The distinction begins on a scale, but it matters in a room. A formulation percentage tells us how much was put into the material. It cannot, by itself, describe the fragrance encountered beside a chair, across a table or at the threshold of a doorway.
First establish what the percentage is of
A percentage basis is the quantity used as the denominator: the mass against which another mass is compared. A statement such as “8% fragrance” is incomplete until that basis is clear.
Lone Star Candle Supply’s calculator guidance explicitly defines fragrance load against wax weight. Armatage Candle Company’s published equations use that convention too: fragrance mass equals wax mass multiplied by the load expressed as a decimal.
Other documentation concerns concentration in the finished product. IFRA’s explanation of its quantitative limits refers to the finished consumer product. That difference is a reason to read the document carefully before comparing two percentages.
For the arithmetic below, the batch contains only wax and added fragrance oil. Its combined mass is wax plus fragrance. The vessel, lid and packaging are outside both denominators. No Cedar Cove production formula or measured batch is represented.
One batch can have two different, correct percentages
Consider an illustrative batch containing 500 g of wax and 40 g of fragrance oil. Its combined mass is 540 g.
On a wax basis, the calculation is 40 ÷ 500 × 100 = 8.00%. On a combined-mixture basis, it is 40 ÷ 540 × 100 = 7.41%, rounded to two decimal places. The quantities have not changed. The denominator has.
These are two descriptions of the same batch. They should not be treated as evidence that one candle contains more fragrance than another.
A fixed batch mass reveals the practical difference
Now begin with a required combined mass of 540 g. If the specification is 8% of wax mass, divide 540 by 1.08: 500 g wax, with 40 g fragrance making up the remainder.
If the specification is 8% of combined mass, multiply 540 by 0.08: 43.2 g fragrance, leaving 496.8 g wax. The two batches weigh the same, but their compositions differ.
The instruction | What it produces in this example |
|---|---|
Make 540 g at 8% of wax mass. | 500 g wax + 40 g fragrance. |
Make 540 g at 8% of combined mass. | 496.8 g wax + 43.2 g fragrance. |
This is mass-balance arithmetic, not a recommended load, a wax-capacity claim or a tested candle recipe. Any other formulation components would need to be included according to the basis specified by the relevant document.
Calculate from mass and preserve the basis in the record
For a wax-based load, let W be wax mass, F fragrance mass and r the percentage divided by 100. Then F = W × r. If the required combined mass T is already known, W = T ÷ (1 + r) and F = T − W.
To convert the same two-component batch from wax basis to combined-mixture basis, divide r by 1 + r, then multiply by 100 to express the result as a percentage. Thus 0.08 ÷ 1.08 × 100 gives approximately 7.41%.
Use masses expressed in the same unit. A tare removes the empty weighing vessel from the scale reading; CandleScience’s guidance on weighing fragrance oil describes that step. Keep the actual component masses with the calculation so that a rounded percentage does not become the only surviving record.
What Cedar Cove’s existing form makes visible
The blank burn-test record in Cedar Cove’s internal Wick Sizing Reference has separate fields for fragrance and lot, fragrance load, wax and lot, vessel, fill and wick arrangement. Its instruction calls for a separate record for each unique combination. The document establishes the structure of the record; it contains no completed comparison proving a load’s performance.
Its field headed “Fragrance Load (%)” also exposes a useful documentation question: percentage of what? For an interpretable record, I would retain the fragrance and wax masses beside that field and write the basis explicitly. That is an editorial recommendation developed from the actual blank form, not a claim that a new studio test has been performed.
A useful illustrative entry would read: 8.00% of wax mass; 40 g fragrance / 500 g wax; 540 g combined batch. Identify the material versions and lots, batch date, weighing method and scale resolution in the working record. Those details allow someone to understand what was made before judging how it behaved.
At Cedar Cove, Matthew and I share sculpture and fragrance curation. A clear formulation record supports that shared practice without making the private composition a public specification.
Separate a material limit from a finished-candle result
A wax supplier’s maximum, a fragrance supplier’s use documentation and evidence from the assembled candle answer different questions. Their figures should be read on their own stated bases before any comparison is made.
CandleScience’s guidance for AAK 464 distinguishes a starting fragrance level from a maximum and cautions that using more can cause burn issues without yielding a stronger scent. That is guidance for the named material. It is not a universal percentage for every soy wax or a disclosure of Cedar Cove’s production choices.
Treat a maximum as a constraint rather than a target. Establish the current instructions for the exact wax and fragrance mixture, then evaluate the complete candle configuration. A calculation that falls below a stated ceiling does not supply the missing evidence about the wick, vessel or behavior through use.
Read fragrance documentation for its intended use
The 51st-Amendment IFRA guidance lists candles, including encased candles, in Category 12. Identify the actual fragrance mixture, intended application, document date and amendment when reviewing a supplier’s Certificate of Conformity.
IFRA explains that these certificates are prepared by fragrance suppliers, rather than issued by IFRA, and do not replace a safety assessment. A certificate for a fragrance mixture is not a certificate of finished-candle fire safety. A high or unrestricted use level in such documentation should not be read as permission to disregard the wax supplier’s instructions or finished-product evaluation.
The current public ASTM F2417-26 scope concerns fire safety for candles. Labeling and applicable annealed glass containers are addressed separately by ASTM F2058-07(2021) and ASTM F2179-26. These references identify distinct responsibilities; they do not establish that any particular candle conforms. Full normative standards and product conformity records were not reviewed for this article.
For the current amendment context, IFRA’s 31 August 2026 end-of-consultation notice says final notification of the 52nd Amendment is expected in January 2027. That is an announced timetable, not an already effective replacement. Check the latest documentation and its actual implementation dates when making a formulation decision.
Read load as a composition detail within the room brief
For a collector or designer, the percentage is most useful when it makes the material account clearer. It does not describe whether a fragrance feels dry, floral, resinous or sweet, or whether its presence is welcome where people sit.
Imagine two project descriptions that both state “8%.” Before comparing them, establish their percentage bases and whether they concern the same fragrance mixture. Even a matching dose does not identify a matching composition. The Journal’s study of wax and fragrance considers the further questions of release, character and the conditions of a room comparison.
The practical brief should name what the occupants want to experience, where that experience matters and which material requirements are essential. Ask the maker for relevant finished-candle evidence and supplied care instructions. Avoid translating a formulation percentage into an unsupported promise of room coverage, duration or preference.
For the broader material account, continue to Candle Wax Explained. For a finished object, compare the current fragrance descriptions in The Collected, then acquire the candle that answers the brief through its individual page. For a project requiring a documented material and fragrance brief, use the Trade inquiry. No proprietary load is needed to begin a useful conversation about the intended setting.
Follow the individual candle’s warnings and Cedar Cove’s Product Safety & Candle Care. A consumer should not add fragrance oil to a finished candle to change its load.
Two questions about percentage notation
Can 8% and 7.41% describe the same candle mixture?
Yes, if the bases differ. In the illustrative two-component batch, 40 g fragrance with 500 g wax is 8% of wax mass and approximately 7.41% of the combined 540 g mass. Compare the component masses and stated basis before interpreting different percentages as different doses.
Does a fragrance blend that totals 100% mean the candle has a 100% fragrance load?
No. Percentages within a fragrance blend describe the shares of that blend. Candle fragrance load describes how much of the resulting mixture is added relative to a separately stated mass, such as wax. The blend’s internal proportions and the candle’s fragrance load answer different questions.
Give the number a clear job
A useful load figure identifies its material, its mass and its basis. With those settled, the arithmetic can be checked and the finished candle can be considered on its own evidence.
The number belongs in the record. The fragrance still has to find its place in the room.
Sources and method
Sources checked 2 November 2026, America/Detroit. The numerical examples and diagram are original illustrative arithmetic using a wax-and-fragrance-only batch. They are not measurements, tested formulations, recommended loads or disclosures of a Cedar Cove recipe. The internal form is blank; no completed load-comparison results are asserted. Interpretation and the proposed record notation are Cassandra Ballard’s editorial analysis.
Lone Star Candle Supply, Fragrance Oil Calculators. Explicit wax-weight convention and supplier guidance; no universal performance inference.
Armatage Candle Company, Candle Math Equations. Published wax-based mass-balance equations. Conversions and examples here were independently calculated.
CandleScience, How do I weigh fragrance oil? Weighing and tare guidance. Getting Started with AAK 464 Soy Wax provides named-material development context, not a house formula or a universal wax limit.
IFRA, Understanding the IFRA Standards. Quantitative limits, certificate scope and safety-assessment distinction. Guidance for the Use of IFRA Standards, 51st Amendment, category table and certificate section. 52nd-Amendment end-of-consultation notice, 31 August 2026, for the current announced timetable.
ASTM International, current active public scopes/abstracts: F2417-26, Fire Safety for Candles; F2058-07(2021), Candle Fire Safety Labeling; F2179-26, Annealed Glass Containers Produced for Use as Candle Containers. Full licensed texts and product test records were not reviewed.
Cedar Cove Candle Company, Wick Sizing Reference, page 2, internal blank Burn-Test Record; reviewed for its fields and instructions. The House, current Journal references and Product Safety & Candle Care supply the first-party practice and reader context.
