I Found a Cheaper Fragrance Oil but Need a Higher Percentage to Achieve the Same Hot Throw — How Do I Compare Actual Fragrance Cost per Candle?

Compare the fragrance in a candle, not in a bottle

Fragrance is bought by the kilogram and used by the gram. If one oil needs 10% of the candle's weight to match the hot throw another gives at 8%, you are buying a quarter more oil for every candle. The only fair comparison is fragrance cost per finished candle at the load each oil actually needs — and, because oil displaces wax, the wax cost changes a little too.

This page takes the incoming-QC view of that question. The cost sum tells you whether the cheaper oil can ever be worth it. The goods-in routine tells you whether each delivery of it actually is, because an oil that only works at a higher load leaves you far less room when a lot arrives slightly weaker.

The worked sum at 8% and 10%

Take Bergamot Amber as the CSI oil in the comparison: 1 kg costs ₹5,437.00, or ₹5,437.00 ÷ 1,000 = ₹5.437 per gram. Say your cheaper oil is priced, hypothetically, 25% lower: ₹5,437.00 × 0.75 = ₹4,077.75 per kg. Say your controlled burn tests showed the CSI oil at 8% and the cheaper oil at 10% giving the same hot throw in the same jar and wax. That equivalence is your own test result; this page does not claim it for any real oil.

Using this series' convention that load is a percentage of the total 200 g candle, 8% is 16 g of oil and 184 g of wax, and 10% is 20 g of oil and 180 g of wax. Price the wax with Luxury Soy Wax CSI 464 at ₹5,074.00 per 10 kg, which is ₹5,074.00 ÷ 10,000 g = ₹0.5074 per gram.

At 25% cheaper per kilogram, the cheaper oil saves ₹7.46 per candle, or 500 × ₹7.46 = ₹3,730.00 a month at 500 candles. Not the 25% the price list suggests, but a real saving. Change the discount and the answer changes sharply.

The pivot is simple to state. To match an oil at 8% while running at 10%, the cheaper oil must cost no more than 16 ÷ 20 = 80% of the price just to break even on oil: ₹5,437.00 × 0.8 = ₹4,349.60 per kg. The 4 g of wax it displaces saves another 4 × ₹0.5074 = ₹2.03, which lowers the true break-even to (₹180.35 − ₹91.33) ÷ 20 = ₹4.451 per gram, or about ₹4,451.00 per kg — roughly 18% cheaper. Anything less of a discount than that, and the cheaper oil costs you more per candle.

To see how sensitive the answer is, suppose your blind test had matched the CSI oil at 6% rather than 8%. At 6%, a 200 g candle holds 12 g of oil and 188 g of wax: 12 × ₹5.437 = ₹65.24 of oil and 188 × ₹0.5074 = ₹95.39 of wax, ₹160.63 in total. The 25%-cheaper oil at 10% still costs ₹172.89, so it is now ₹12.26 dearer per candle. The same two oils, the same prices, and the conclusion flips on two percentage points of load. That is why the load figures must come from a properly controlled burn comparison, done in your jar and wax, rather than from a quick impression of which bottle smells stronger.

Costs the per-candle sum leaves out

A higher load is not free even when the arithmetic favours it. More oil in the wax can change how the candle burns, and each of those changes has a cost.

Goods-in rules for an oil that runs at a higher load

If you do adopt the cheaper oil, its goods-in routine should be stricter than for an oil with headroom, because every lot has to deliver its full strength at the approved load. A practical routine, as a suggested starting point:

Keep a retained reference from the lot you approved — about 20 ml, tightly capped, full, dark and cool. When a new lot arrives, quarantine it and compare it on scent strips beside the reference after both are at room temperature. Then pour two confirmation candles at your approved 10% with the approved wick, cure them for the time your approval specified, and burn them beside a candle from the approved lot if you have one retained. Release the lot only if hot throw and burn behaviour match. Write the lot code on every production batch sheet that uses it.

For the CSI oil at 8%, the same routine applies, but a lot that comes in marginally softer can be re-tested at 9% inside the wax's stated range. That flexibility has value, and it is part of why the per-candle sum is not the whole story.

Ask each supplier the same documentation questions. CSI's product pages state its oils are IFRA certified and provide IFRA and MSDS documents on WhatsApp request (+91 7397976926). Lot numbers and certificates of analysis are not published on the pages. Record what each supplier tells you, and file it with the invoice.

Deciding, honestly

If the cheaper oil clears the break-even discount comfortably, passes a wick test at its higher load, survives hot-shelf storage and delivers its approved throw lot after lot at goods-in, it is the cheaper oil and you should use it — even if the oil it replaces is ours. If it only just clears the break-even, the lost headroom and extra testing will probably eat the difference.

One more step keeps the decision honest over time. Recalculate the per-candle cost whenever either price changes, and whenever a goods-in comparison forces a load change. A saving calculated once, at one price and one lot, has a habit of outliving the facts that justified it.

Where this page fits

CSI already has guides that cover parts of this question. This page covers the goods-in check for the question above; these go deeper on the rest:

Three things to buy for this job

Frequently asked questions