I Use the Same 10% Fragrance Load for Every Candle — Could Optimising Each Fragrance Individually Reduce My Average Raw-Material Cost?

Why a flat load overpays on some oils and not others

A flat load is a production decision, not a formulation result. It is easy to weigh, easy to teach, and safe on throw, because 10% is the top of the stated candle range on most of the oils here. But oils differ: some will pass a blind throw test lower in your wax and jar, and some will not. Where an oil would pass at 7%, every candle poured at 10% carries 6 g of oil it does not need. Where it needs 10%, the flat rule costs nothing. The overpayment is therefore not spread evenly. It sits in particular oils, and how much it costs depends on two things only: how many of those candles you sell, and how expensive a gram of that oil is compared with a gram of wax.

That second point matters more than makers expect. The fill weight stays at 200 g whatever the load (series default; use yours). Take 6 g of oil out and 6 g of wax goes in. So the real price of a gram of oil in the candle is oil price per gram minus wax price per gram. With Luxury Soy Wax Chunks at the 10 kg price (0.5999 rupees a gram), Lavender's net price is 4.6211 rupees a gram, Dark Vanilla's 7.0461, and Citrus Lemon's only 2.2321. A two-point cut on Dark Vanilla is worth more than three times the same cut on Citrus Lemon.

The range BOM: flat 10% against per-oil loads

A range has no single bill of materials, but it has an average one: each line weighted by the sales mix. The worked range sells 1,000 candles a month (Lavender 220, Woody Oud 180, Roasted Coffee 150, Dark Vanilla 120, Jasmine 100, Citrus Lemon 90, British Rose 80, Eucalyptus Spearmint 60; worked example, use your own). Fragrance is priced at each oil's 1 kg CSI price; wax is Chunks at the 10 kg price; the wick is one Eco C2; jar and box are your supplier's figures, labelled.

Fragrance is 31.1% of the average flat-10% candle, the second-largest line after wax, and the only line this change touches. The average falls by ₹13.67, or 4.7%. That is a modest-looking number per candle and a large one per year, which is the whole character of this lever: it is invisible to the customer if the tests pass, and it compounds with volume. How that kind of per-candle figure turns into annual profit is the job of the ₹10-a-candle-at-1,000-a-month post; here we stay with where the rupees come from.

The weighted sum, oil by oil

Here is every oil in the worked range at the flat 10% and at its worked approved load, with the net saving per candle (oil saved minus wax added) and per month. Prices are CSI's 1 kg per-gram prices on 4 October 2026.

Three things stand out. First, Lavender is ₹6,100.60 of the ₹13,677.80: the biggest seller, with the second-highest net price, cut the furthest. Second, Dark Vanilla, the dearest oil, contributes nothing in the worked example, because its test kept it at 10%. Third, Citrus Lemon's cut is worth ₹401.40 a month: real, but small enough that the test may not be worth running (next section).

The average grams figure is still useful, but for buying, not for pricing the saving. At a flat 10% the range uses 20.0 kg of fragrance a month; at the per-oil loads, 16.24 kg. Lavender drops from 4.40 kg to 3.08 kg a month, ₹6,891.72 of oil you no longer buy each month. Ordering to the new consumption is where 6036 and 6038 pick up; the point here is that the saving shows up as less cash spent on oil, not as a discount.

The testing burden, and the order to test in

Each oil needs its own controlled ladder: the current 10% as a control plus two lower rungs, three candles each, in your jar, wax and wick, cured and burned to the end. Which rungs to pick and how to judge them is the lower-load test design post; this page only counts the cost. With the example rungs of 10%, 9% and 8%, one oil's ladder uses 162 g of oil and 1,638 g of wax, priced at your production stock:

You do not know an oil's approved load until you test it, so rank the queue by opportunity: what the oil would save if it passed two points lower. That is candles a month × 4 g × its net price per gram. The order that falls out puts high-volume, high-price oils first and cheap slow sellers last.

The top four oils (Lavender, Dark Vanilla, Woody Oud, Roasted Coffee) are 67% of the candles and 78% of the opportunity. Notice that Dark Vanilla is second on opportunity but, in the worked example, fails: a high rank tells you where to look, not what you will find. On the worked results the top four tests cost ₹13,034.46 and return ₹9,874.00 a month, 72% of the whole range's saving, paying back in about 1.3 months.

Running the tests is not the only cost of eight loads. Eight recipes on the bench means eight numbers to weigh, and a mis-weighed batch is a scrapped batch. If juggling loads costs you 1 scrapped batch of 20 a year (worked example; use your own records), that is ₹5,816.00, still small against ₹1,64,133.60 a year, but real. The recipe card and labelling discipline that prevents it is set out in the per-SKU recipe card post. When twenty or more SKUs are involved, how much retesting each change needs is the quick-confirmation-versus-revalidation post.

The decision rule: months to repay, and when to stop

Put it as one rule: test an oil when candles a month × grams you hope to save × (oil ₹/g − wax ₹/g) repays its ladder within about six months (judgement: long enough to be worth an afternoon, short enough that nothing else changes first). Work down the queue, and stop at the first oil whose payback, even if it passes, runs past your limit. At 1,000 candles a month every oil in the worked range clears that bar (the slowest, Eucalyptus Spearmint, repays in 4.9 months), so all eight get tested, top first. Scale the same range to 300 a month and only the top four clear it: Jasmine takes 7.6 months and Eucalyptus Spearmint 16.3, so the other four stay at 10%.

Volume is the swing factor. At 1,000 candles a month, even the conservative case repays every test in a few months. At 300 a month the same tests take roughly three times as long, and the bottom of the queue drops out entirely. If your whole range sells a few dozen candles a month, a flat load may be the rational choice: the rupees are not there to repay the testing. That is the same opportunity-first logic as optimising ten SKUs by annual opportunity, applied to oils instead of products.

Where CSI packs help, and where they save nothing

Nothing on this page needs you to change supplier or buy more. The fragrance saving is grams you stop pouring. Two pack facts matter all the same, because lower loads change how much you buy:

Oil ladders differ. On CSI's list the per-gram price falls steeply from 15 g to 100 g and then flattens. Woody Oud is ₹4.53 a gram from 100 g up; Lavender's 1 kg is only ₹19.00 cheaper than two 500 g packs; Dark Vanilla's is ₹34.00 cheaper. If lower loads take an oil's monthly use below a kilo, dropping to 500 g packs costs you almost nothing per gram on these oils. Check each oil's own ladder: on 20 of the 78 oils CSI sells in both 500 g and 1 kg, the 1 kg costs more than two 500 g packs.

Wax goes up, slightly. The 3,760 g of extra wax a month costs ₹2,255.62, already netted out of every figure above. Luxury Soy Wax Chunks is near-flat per kilo: the 500 g bag is fractionally the cheapest per gram and the 10 kg costs ₹9.00 more than ten 1 kg bags.

Where CSI can help is with the test itself: 100 g bottles of all eight oils are in stock on 4 October 2026 if you need top-up oil for a ladder, and we can share MSDS and IFRA documentation on request on WhatsApp for any oil whose load you change.

The test gate before any load changes in production

The money case above is only as good as the approved loads it uses. Each oil's new load must earn its place against the 10% control, with everything else frozen. The method belongs to the formulation and change-control series: finding the lowest load that still throws is the lowest effective load guide; running twenty scents without testing every rung of every oil is the faster formulation method for a large range; and what to do once an oil passes lower is redesigning the formula around the lower load.

What must stay identical for the customer: the scent they recognise, the throw at the distance they expect, the burn time and the look of the wax. Change control for the whole range, including which changes need full revalidation, is the full retest list when the oil formula changes, and the broader programme for cutting costs 10% without risking bestsellers is the 10% cost-reduction test plan.

The oils and wax in the worked range

Four of the eight oils and the wax, chosen because they mark the ends of the worked range: the biggest seller, the dearest and the cheapest oil, an oil with a flat ladder, and the wax every saved gram turns into. Ranked on page statements, price and stock on 4 October 2026; CSI publishes no throw data. Per-candle figures use a 200 g candle at each oil's worked load.

Also in the worked range, at the same 1 kg prices: Roasted Coffee (₹3,738.00), Jasmine (₹3,923.00), British Rose (₹3,068.00) and Eucalyptus Spearmint (₹3,068.00), all sizes in stock on 4 October 2026. Swap in your own oils and prices; the method does not change.

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