One Fragrance Costs More Per Kg but Gives Better Hot Throw at a Lower Load — How Do I Determine Which One Is Actually Cheaper Per Candle?

The two-line calculation, and the unit it has to be in

A kilo of fragrance oil is not a thing you sell. A candle is. So the only cost that matters is the cost of the oil inside one candle, and getting to it takes two lines:

Line one — grams per candle. Fragrance load on CSI pages is expressed as a percentage of total wax weight. With a 185 g wax fill, oil per candle = 185 × load. A second convention exists in which the load is a share of the finished candle; it gives slightly smaller oil figures and is worked through in the load guide for floral, woody and gourmand oils. Use one convention for both oils or the comparison is void.

Line two — rupees per candle. Oil cost per candle = grams per candle × price per gram at the pack you will actually buy. This second clause is where most comparisons go wrong. Royal Apricot is ₹3.667 a gram at the kilo and ₹3.67 a gram at 100 g — effectively flat. British Rose is ₹3.068 a gram at the kilo but ₹3.422 a gram at 100 g, an 11.5% difference, which is enough to shift a close comparison. Compare at the rung you are buying this month, then again at the rung you expect to buy next year.

The break-even multiple: one number that screens any pair

You do not need the full calculation to shortlist. Because grams per candle scale linearly with load, the whole comparison reduces to a ratio. Divide the higher load by the lower one. The result is the maximum price-per-kilo premium the lower-load oil can carry before it stops being cheaper per candle. If the dearer oil's premium is under that multiple, it wins. If it is over, it loses — and no amount of good throw at a low load changes the arithmetic.

Four real pairs, costed to the paisa

These are live CSI listings at the loads their own pages state, on a 185 g wax fill, at kilo pricing. Two pairs flip, one is close, one does not flip at all. The pattern to take away is not which oil is best — it is how quickly the ratio tells you before you spend anything.

The last row is the most instructive. A ₹2.63 advantage per candle is real, but it is inside the noise of everything else you have not controlled yet: your wick, your cure length, your rejects, the 5% of oil that stays in the bottle. When a pair lands that close to break-even, stop optimising on price and decide on something else — the stated discolouration position, how the profile fills a gap in your range, which pack ladder suits your run size. Price has told you what it can. The pairs that clear by ₹9 or fail by ₹59 are the ones where the arithmetic should actually drive the order.

The low-load oils on this store, and what their pages actually say

Three of these four sit in CSI's fine-fragrance group, whose pages share a published usage table and the instruction to begin at 7%. The fourth states a narrower band and says plainly that it is intended to work at the bottom of it. Each card shows every listed rung with the price per kilo at that rung, and how many candles the pack covers at 7%. Per-candle figures in the footers are at kilo pricing on a 185 g fill.

"Better hot throw at a lower load" is a claim you have to own

The question assumes a performance fact, so it is worth being exact about where that fact can and cannot come from. A CSI product page publishes a recommended load band, a scent pyramid, a discolouration position, cure guidance, and — on about half the fragrance listings — a flash point, of which many are only the shared "greater than 93°C" threshold rather than a measured figure. Some pages also describe projection in words. None of that is a measured hot-throw result, and CSI publishes no throw test data. Anyone who tells you oil A throws better than oil B at a lower load is reporting their own wax, jar, wick, cure and room — and every one of those changes the answer.

That is not a reason to ignore the claim. It is a reason to price the test instead of the rumour. A three-jar comparison on one oil needs roughly 38.85 g at 7% across three 185 g jars, so a 50 g bottle covers it: ₹183 on Royal Apricot, ₹192 on Pomegranate Splash, ₹299 on Mint Sandalwood, ₹449 on Coffee Vanilla Tobacco. Add a kilo of wax and a handful of wicks and the whole experiment sits under ₹1,500 — against a ₹3,667 to ₹8,599 commitment if you buy the kilo first and find out afterwards.

The same decision at 100 candles and at 500

Per-candle differences look small and behave large. Here is the Royal Apricot against British Rose pair — the clean flip — scaled to two realistic run sizes, with a labelled 5% allowance for spills and bottle residue, and priced on what the listings actually offer rather than on an imaginary bulk rate.

Two things change once you price the packs instead of the grams. The gap widens, from ₹927.04 to ₹1,005 on a hundred candles, because the 10% recipe is forced into a second whole kilo while the 7% recipe only needs a handful of 50 g bottles on top of one. And the 500-candle rows make the real constraint visible: at ten kilos you are buying ten separate listed packs of the same oil, which is the point at which a quote is worth asking for. What that quote will be is not something this page can tell you — but the listed figures above are a valid ceiling, so they are a safe number to budget against while you wait for one.

Running it on any two oils, start to finish

Six steps, no spreadsheet required. Do it once properly and the habit takes about ninety seconds per pair afterwards.

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