I'm Buying Fragrance Oil in Bulk for Candle Production — How Should I Determine the Optimum Dosage Before Calculating How Many Kilograms to Order?

Step 1–2: test and decide

The optimum dosage for a production candle is the lowest load that meets your throw target and burns cleanly in your system — your wax, jar, wick and cure. It is not the wax's ceiling (Luxury Soy Wax Chunks are rated up to 13% and CSI 464 up to 10%, but those are maximums, not recommendations), and it is not the same for every scent (I'm Making Different Candle Fragrances in the Same Soy Wax — Should Every Scent Automatically Use the Same 8% Fragrance Load? explains why). CSI publishes no dosage data for any oil, so the number has to come from your own test.

Step 3–4: calculate and allow

With a dose for each scent, the arithmetic is simple, but it has two traps: the load convention and the allowance. The example below is a festive production plan of 1,200 × 200 g candles in Luxury Soy Wax Chunks, split across three scents. The tested loads — 7%, 9% and 8% — are hypothetical results used to show the arithmetic, not findings for these oils.

The load convention matters most at this step. CSI's guides use load as a share of the finished candle: oil = candles × weight × load. If you instead take 7% of the wax for 500 Bergamot Amber candles — 93,000 g of wax × 7% = 6,510 g — you order 490 g less than the 7,000 g the candles actually need, and every candle comes out at a true load of 6.54%. To hit a true load on a fixed wax weight, use oil = wax × L ÷ (1 − L). I'm Making a 1 Kg Soy Wax Batch at 8% Fragrance Load — Do I Add 80 g Fragrance Oil to 1 Kg Wax or Should the 8% be Calculated from the Total Finished Candle Weight? and the 10 kg batch guide cover both conventions.

The allowance covers what never reaches a finished candle: oil left on the jug, a re-poured batch, the first production candle you burn to check it matches the test. Plan 3–5% extra as a working assumption; this page uses 4%. If your process is new, or you are pouring by hand from many small jugs, the higher end is safer. For the full wastage and trial maths on fixed runs, see 500 candles at 8% and 1,000 candles at 10%.

Step 5: round to real packs

CSI lists most oils in 15 g, 50 g, 100 g, 500 g and 1 kg packs. The cheapest way to cover a quantity is not always "as many kilos as possible": on the listed catalogue, 52 of 91 oils cost within 1% per gram at 1 kg as at 100 g, and only 24 show a kilo saving of 5% or more. So price the mix for each scent. The table below shows the per-gram ladder for the three oils in this plan.

Apple Cinnamon is priced flat from 50 g to 1 kg, so any mix that covers the quantity costs the same per gram; buy the kilos for convenience and fewer bottles to open. Bergamot Amber and Raat Ki Rani step down slightly at 500 g and 1 kg, so their orders lean on the larger packs. In every case the difference between a sensible mix and an all-100 g order is small; the difference between the right load and the wrong load is large. Beyond the listed 1 kg packs, message CSI for a quote — no volume discount figure is published, so ask rather than assume.

Tested dose vs untested 10%

Here is the same 1,200-candle plan ordered two ways: at the (hypothetical) tested loads, and at a flat 10% chosen without testing, both with the 4% allowance and the cheapest pack mix.

The untested order spends ₹29,447.06 more and buys 5,200 g more oil. But the money is only half of it. At 10%, Apple Cinnamon — which in this example needed 9% — is fine, but Bergamot Amber and Raat Ki Rani carry oil their tests said they did not need, and in some scents extra oil can hurt the burn (I Reduced My Fragrance Load from 10% to 8% and the Candle Suddenly Burns Better — How Can Less Fragrance Sometimes Produce Better Overall Performance?). And if a scent's test had shown it needed 11% in Chunks, a flat 10% would have left it under-dosed. The test protects the order in both directions.

The wax side of the order

The dose also sets the wax: wax = candles × weight − oil. For this plan that is 221,000 g of Luxury Soy Wax Chunks, or 229,840 g with the same 4% allowance. Chunks cost ₹599.00 per kilo at 1 kg, ₹2,995.00 for 5 kg and ₹5,999.00 for 10 kg — effectively flat, so the pack choice is about handling and storage, not price.

Both options buy 230 kg; the 5 kg packs come out ₹207.00 cheaper because the 10 kg pack is priced at ₹599.90 a kilo against ₹599.00. At this scale — 46 bags — it is worth asking CSI on WhatsApp for a quote on the whole wax quantity; no volume discount figure is published. Luxury Soy Wax Chunks are rated up to 13% fragrance load, so every tested load in this plan sits comfortably inside the ceiling. If you produce in CSI 464 (₹507.40 a kilo, rated up to 10%), re-test there: a load chosen in one wax does not transfer to another.

Timing the order

The sequence has a calendar. Test candles need a cure before they can be judged, and production candles need a cure before they are sold. Working backwards from a festive date shows how little slack there is.

It is tight, and that is the honest point: if you are reading this in late September for a Diwali run, the test has to start this week. If it cannot, the fallback is to produce at a conservative load you have already tested in an earlier batch — not at an untested one — and run the proper test for the wedding season. Restocks on popular sizes cannot be guaranteed late in October, so order promptly once the loads are set.

Two siblings take this further. If you are splitting a run across scents that will sell unevenly, dividing a purchase across five fragrances covers that. If you are choosing which scents justify kilo packs at all, see I'm Launching 10 Candle Fragrances — How Do I Decide Which Scents Deserve 1 Kg Fragrance Oil Purchases and Which Should Remain in Smaller Trial Sizes?. And if cost per candle rather than cost per kilo is the real question, One Fragrance Oil Costs More but Gives Stronger Hot Throw at a Lower Dosage — How Do I Compare Fragrance Oils by Cost per Finished Candle Rather than Price per Kilogram? compares oils on that basis.

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