One Fragrance Gives Strong Hot Throw at 6% While Another Needs 10% — How Do I Compare Their True Fragrance Cost Per Finished Candle?

One formula, and why a price per kilogram answers nothing

Two quotes land in your inbox. One oil is dear and your burn tests say it holds up at 6%. The other is cheap and needs 10% before the room smells of anything. Almost everyone compares the two rates per kilogram, notices that one is far higher, and stops there. That comparison is not wrong so much as incomplete: it prices a kilogram of oil, and you do not sell kilograms of oil. You sell candles, and the number of grams of each oil that goes into a candle is different.

The whole of this page rests on one line of arithmetic. Fragrance load is a percentage of wax weight, which is how CSI product pages state it, so the fragrance line of one candle is:

Run it both ways and you have your answer for that one candle size. Run it as algebra instead and you get something far more useful: a rule you can apply to any pair of quotes without recomputing anything. Set the two fragrance costs equal to each other. The wax grams appear on both sides, so they cancel and disappear. What survives is that the low-load oil breaks even when its rate is the high-load oil's rate multiplied by the high load divided by the low load. For 6% against 10% that is 10 ÷ 6, or 1.67×.

That single number does more work than any table. It says the 6% oil can be 1.67× the price per kilogram — two-thirds dearer again — and you pay exactly the same for the fragrance in every candle you pour. Above 1.67× it costs you money. Below it, it saves you money. And because the wax grams cancelled, the multiple is identical on a 100 g candle, a 200 g candle and a 300 g candle. Only the rupees at stake change.

Look at the last row before you go any further, because it is the one that changes behaviour. If your two oils are one percentage point apart, the dearer one is allowed to be about 11% dearer per kilogram, and no more. A one-point load advantage almost never justifies a premium price. A four-point advantage, as in your question, justifies a large one. The instinct that a stronger oil is worth paying for is sound; the size of the premium it is worth is where the arithmetic disagrees with most people.

The break-even rate: what your 6% oil is allowed to cost

A multiple is easy to carry in your head; a rupee figure is easier to check a quote against. Multiply the high-load oil's rate by the multiple and you get the break-even rate — the exact price per kilogram at which the two oils cost the same per candle. Use live CSI pricing to make it concrete: Eucalyptus Spearmint at the 1 kg pack is ₹3,068.00 a kilogram, or ₹3.07 a gram. Multiply by 1.67× and the break-even rate for a 6% oil is ₹5,113.33 a kilogram, which is ₹5.11 a gram.

That is now a purchasing rule rather than a calculation. Any 6% oil quoted under ₹5,113.33 a kilogram is cheaper per candle than Eucalyptus Spearmint at 10%. Any 6% oil quoted over it is dearer. You do not need to know the candle size, the wax price, the vessel or your monthly volume to use that line, and it stays valid until one of the two rates moves.

It also runs backwards, which is the version most makers find more honest. Instead of asking what the premium oil may cost, ask what load it would have to work at to justify what it does cost. Divide the cheap oil's rate by the dear oil's rate and multiply by the cheap oil's load. Sage and Cedarwood at the 1 kg pack is ₹6,867.60 a kilogram, so against Eucalyptus Spearmint at 10% it would have to perform at 4.47% to break even. Its own product page states up to 10% for soy wax. A working load of 4.47% is well under anything the page describes, so on those two pack rates the arithmetic has already decided.

One caution about the backwards version. An equivalent load of 4.47% is an arithmetic result, not a recommendation: it is the load at which the money would balance, not a load anyone has tested or published. Nothing on this page suggests pouring an oil below the range its page states. The figure is there to show you how far the premium would have to be earned, which is usually further than a supplier's sample burn suggests.

Three candle sizes, one break-even rate, three different stakes

Here is where most comparison articles quietly mislead. They run the numbers on one candle size, print a verdict, and leave you to assume it transfers. Half of that assumption is right. The break-even rate does transfer — it is the same rupee figure on every size you pour, because the wax grams cancelled out of the algebra. The rupee gap does not transfer at all: it scales directly with the wax in the candle, so a decision worth a little on a votive is worth three times as much on a large jar.

Read the last column first. It is the same figure three times, and that repetition is the finding. Whatever you pour, the question "is this 6% oil worth it?" has one answer expressed as a rate: ₹5,113.33 a kilogram. Now read the gap column, which triples from ₹10.53 to ₹31.58. If you make 100 g travel candles, choosing the dearer oil on these two rates costs you ₹10.53 a unit and you may well decide the scent is worth it. If you make 300 g three-wick jars, the same choice costs ₹31.58 a unit, and across a hundred jars that is a decision with a real number attached.

Across a hundred 200 g candles the gap is ₹2,105.12 of fragrance, on the 1 kg packs of both oils. That is the figure to put in front of yourself before you fall in love with a sample. It is also the figure that the next section halves, quarters, and then very nearly erases — not by changing oils, but by changing which pack you tick at checkout.

The rule run on two real oils you can order today

Your question supplies loads but no prices, which is the right way round — the loads come from your burn tests and the prices come from whoever is quoting you. To make the rule checkable, here it is on two oils in live CSI stock, chosen because their published soy ranges are identical and their prices are not. Eucalyptus Spearmint publishes soy use up to 10% of total wax weight, a flash point of 199°C and 0% vanillin, and the page states IFRA certification. Sage and Cedarwood publishes up to 10% for soy wax, a flash point of 190°C and 0% vanillin content. Neither page publishes a working load, and neither could: that is a property of your wax, your wick and your room, not of the bottle.

So treat the 6% and the 10% in your question as your own test results, hold the published ceilings as the upper bound, and let the prices do the rest. On the 1 kg packs the rates are ₹3.07 and ₹6.87 a gram, a multiple of 2.24× against a break-even of 1.67×. The dearer oil fails the test, and it fails it comfortably.

This is the point at which a supplier's blog usually starts explaining why the dearer oil is worth it anyway. It might be — Sage and Cedarwood is a different scent doing a different job, and no spreadsheet ranks a smell. But on money alone, at these two pack rates, the cheaper oil at the higher load wins by ₹21.05 a candle, and saying otherwise would be selling you something. What the arithmetic does entitle you to is a clear question for your own testing: is the scent difference worth ₹21.05 a unit to your customer? That is a pricing and positioning question, and it has a perfectly respectable yes.

It is worth seeing the same two candles as whole objects too, because the fragrance line is rarely the biggest one. Put both oils in the same wax and the same vessel — 200 g of Luxury Soy Wax CSI 464 at ₹507.40 a kilogram, an Amber Shiny Glass Jar with Black Lid at ₹47.20 and an Eco Wick Thin (C1) at ₹5.90 — and the gap between the two finished candles is still exactly ₹21.05, because only the fragrance line moved.

Two things in that table are worth a sentence each. The fragrance line is 28.42% of the cheaper candle's materials and 34.77% of the dearer one, so fragrance is the single biggest lever in this recipe but it is not the whole of it — a wax or vessel decision of the same rupee size deserves the same scrutiny. And the two jars are not holding the same amount of scented wax: 220.00 g against 212.00 g, because the 10% candle carries eight more grams of oil on the same 200 g of wax. If your vessel is the constraint rather than the wax weight, cost the two candles on the grams your jar actually takes, not on a round number.

The pack you tick can flip the verdict entirely

Everything above used the 1 kg pack of each oil, which is the default assumption almost every costing makes: buy the biggest pack, get the best rate. On CSI's catalogue that assumption is often wrong, and on Sage and Cedarwood it is wrong in a way that decides this entire comparison. The page's lowest published per-gram rate is the 500 gm pack at ₹5.17 a gram — under the 1 kg pack's ₹6.87. Two 500 gm packs come to ₹5,168.40 for the same 1,000 g that the 1 kg pack sells for ₹6,867.60, a difference of ₹1,699.20 on identical contents.

Read the 500 gm row twice. At ₹5.17 a gram the dearer oil at 6% costs ₹62.02 a candle against ₹61.36 — a gap of ₹0.66, which over a hundred candles is ₹66.08. The verdict has not quite flipped, but it has gone from a real cost difference to a rounding error, and it did so without a single change to the wax, the wick, the loads or the scent. Its actual multiple against Eucalyptus Spearmint falls from 2.24× to 1.68×, against a break-even of 1.67×. That is the whole decision, moved by a checkout option.

The general lesson matters more than this one pair. CSI does not run a per-kilogram quantity discount: across the catalogue most ladders are flat per kilogram at every pack size, two waxes fall at 5 kg, three waxes are dearer per kilogram in the bigger pack, and on the oils the only consistent step is from 15 g to 50 g — after which 67 oils hold the same per-gram rate all the way to 1 kg, and 13 are dearer per gram in the largest pack. So the pack size is not a discount question. It is a per-gram rate you have to read off the page, every time, for the oil in front of you.

Eucalyptus Spearmint runs the other way, which is worth showing so the rule does not look like a trick. Its rates fall steadily from ₹4.56 a gram at 15 gm, to ₹3.54 at 100 gm, to ₹3.07 at 1 kg, so on that oil the largest pack really is the lowest published rate. Two oils, two different shapes, one discipline: take the per-gram rate from the pack you will actually buy, then apply the multiple.

One more line belongs in this section, because a pack decision is also a parcel decision. The 1 kg pack of Sage and Cedarwood stores a packed weight of 1.5 kg and the 500 gm pack 0.8 kg, and CSI's published rates are flat bands by weight. As at September 2026 the cheapest band covering 1.5 kg is ₹180.00 on Standard Shipping and the cheapest covering 0.8 kg is ₹110.00. Ordering two 500 gm packs on separate occasions bills ₹220.00; ordering them together bills ₹180.00, a saving of ₹40.00. That is the only reliable saving in buying bigger on this store, and it comes from the parcel, not the price list.

Running it on your own two quotes, in four steps

Two practical notes on step one, because it is the step people skip. First, change one variable at a time: the same wax grade, the same wick, the same vessel and the same cure for every load in the ladder, or you are testing four things at once. Second, respect the ceilings while you do it. Where a wax grade publishes a stated maximum and an oil page publishes a range, the lower of the two governs, and those figures are the wax and fragrance manufacturers' stated formulation maximums rather than any kind of rule imposed from outside.

What a break-even rate cannot tell you

A clean rule invites overconfidence, so here is what this one does not cover. It does not rank hot throw: two oils at their respective working loads are, by definition, both performing, and which one fills a room more pleasantly is a judgement your customer makes, not a number. It does not account for discolouration, which is a cosmetic matter of vanillin content stated on each page — both oils in this worked example publish 0% vanillin, but a gourmand oil at a low load may still tone a white wax more than a citrus oil at a high one.

It does not price risk, either. Running an oil near the top of its stated range leaves you no headroom: if a hot Ahmedabad afternoon, a wetter monsoon week or a slightly bigger jar costs you a little throw, the oil at 10% has nowhere to go, while the oil at 6% can be lifted a point or two and retested. That flexibility has a real value that this page will not put a number on, because inventing one would be the opposite of what a costing page is for.

And it does not cover what happens at the wick. Adding oil is one route to a stronger room; a better matched wick is another, and the two routes have completely different cost shapes — one is a recurring cost on every candle you ever pour, the other is a one-off test series. If your reason for wanting the 10% oil is throw rather than price, the wick is where to look first, and CSI's wick guide by diameter is the practical starting point.

Finally, a flat note on documentation, since a comparison like this often ends in a purchase order. Both oil pages state their flash points — 199°C for Eucalyptus Spearmint and 190°C for Sage and Cedarwood — and a flash point is a transport, storage and handling property, not a ranking of throw and not the temperature at which fragrance burns away. The usual 80-90°C window for adding fragrance sits well below both. MSDS and IFRA documentation for either oil is available on request on WhatsApp.

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