I'm Comparing Two Fragrance Oils Where One Costs Twice as Much but Works at a Lower Dosage — Which One Is Actually Cheaper per Finished Candle?

The break-even dosage

Two candles made with different oils differ in only two lines: the oil and the wax. The wick, jar, lid and label are the same. So the comparison needs just those two lines. For a candle of weight W at load L, oil and wax together cost W × [L × p + (1 − L) × w], where p is the oil's price per gram and w the wax's. Set the dearer oil B's cost equal to the cheaper oil A's and solve for B's load:

Why the wax matters: if B works at a lower load, you pour more wax into each candle to keep the weight the same. That extra wax is a cost the naive comparison forgets. With Chunks at ₹0.60 a gram it is small but not negligible — it moves the break-even for our pair from 3.96% to 3.64%. With a dearer wax the effect is larger; with Natural Soy Pearl at ₹0.42 a gram it is smaller.

Read down the table: at 3.5% the dearer oil is fractionally cheaper; at 4% it is already dearer by ₹5.36, at 5% by ₹20.16 and at an equal 8% by ₹64.56. The break-even sits at 3.64%. Add the identical lines back — an Eco Thin C1 wick (₹5.90) and a White Matte Glass Jar (₹70.80) — and each candle's materials are ₹76.70 higher, but the difference between the two oils does not change.

The ratio depends on the pack

‘Twice the price’ is usually a comparison of two bottles. But the price ratio per gram can change with the size you buy, because a few oils have a real kilo break and most do not. Mango Coconut is one of the 24 oils where the kilo is at least 5% cheaper per gram (20.7%); Jasmine Coconut Spa Ceylon is priced flat. So the pair's ratio — and the break-even — depends on which sizes you compare.

From the 15 g tester to the 100 g the dearer oil is only about 1.4 to 1.6 times the price, so it needs to work at roughly 4.8% to 5.4% to break even. At the kilo it is 2.02 times, and the bar drops to 3.64%. If you are comparing a kilo of one against 100 g of the other, you are comparing sizes as much as oils. Always compare at the size you will actually produce from. Per-gram price breaks are rare across CSI's listed catalogue, so for most pairs the ratio is the same at every size — but check both oils' ladders before assuming it.

A worked example with your test result

CSI has not published dosage or throw measurements for any oil, and a claim that an oil ‘works at a lower dosage’ means nothing until you have seen it in your own wax, jar and room. So the worked example below uses a labelled example test result, the kind you would get from the ladder test in the next section: your blind scorers rated Jasmine Coconut Spa Ceylon at 6% as equal to Mango Coconut at 8%. Replace 6% with your own finding.

Finding the real dosage: the ladder test

The ladder test finds the lowest dosage at which the dearer oil matches your current candle. Pour the cheaper oil at your normal load as the reference, and the dearer oil at three or four lower loads. Score them blind. The lowest load that scores level with the reference is your tested dosage — the number that goes into the formula.

Keep every load inside the wax maker's stated maximum — Luxury Soy Wax Chunks are rated up to 13%, CSI 464 up to 10% — which a lower-dosage ladder always does. If none of the lower loads matches the reference, the dearer oil does not ‘work at a lower dosage’ in your candle, and the question is settled. If you want to go below the break-even, add a 3.6% candle to the ladder: that is the load at which the two oils cost the same.

What it is worth at volume

Differences of a few rupees a candle become real money over a production run. Here is the monthly difference over 500 candles for the dearer oil at several tested dosages, against Mango Coconut at 8%, at 1 kg rates. Positive numbers mean the dearer oil costs more.

At 6% the dearer oil adds ₹17,480.00 over 500 candles. Even at 4% it costs ₹2,680.00 more; only below 3.64% does it start to save. The last column is worth a glance too: a lower dosage means fewer kilos to buy and store, which matters for cash flow. The load-reduction post covers cutting one oil's load, and the 8% → 10% post the reverse; the supplier-discount post covers the different question of whether a bulk discount on one oil changes the answer.

Where this fits: the oil and wax lines compared here sit inside the full cost sheet. At a fixed selling price, the break-even dosage interacts with the oil cap in the ₹399 post and the ₹799 post, and at the luxury tier with the allocation in the ₹1,499 post. If the dearer oil wins your test and becomes a best-seller, the five-bestsellers post covers when to move it to kilos.

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