I'm Scaling a Custom Fragrance Blend from 100 g to 5 Kg — How Do I Preserve the Exact Ratios and Minimise Weighing Errors?
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Will the bigger batch be less accurate? Usually more accurate. A scale's rounding error is a fixed number of grams, so it matters most on small weights. On a scale reading in whole grams, ±0.5 g is 2.5% of a 20 g component but 0.05% of 1,000 g. See the error maths.
What if I overshoot one component? Do not remove oil. Recalculate the rest from the actual figure: if Ylang Ylang lands at 2,512 g instead of 2,500 g, make Vanilla Bean 1,507.2 g and Neroli 1,004.8 g. The ratio is kept; the batch is slightly larger. See the method.
What does 5 kg of blend make? At 8% of finished weight, 5 kg of oil scents 62.5 kg of candles: 312.5 candles of 200 g, with 57.5 kg of wax. The example blend's components cost ₹31,475.20 at listed pack prices.
The ratio is the easy part
The most common scaling mistake is not arithmetic at all. It is scaling from the wrong starting point: the grams in a test candle, rounded to what the scale could show, rather than the percentages the blend was designed with. If your test candle had 8 g of Ylang Ylang, 5 g of Vanilla Bean and 3 g of Neroli because that was what the scale could manage, your "formula" is 50/31.25/18.75, not 50/30/20. Write the blend down as percentages first, then derive every batch from them. Converting a blend ratio into grams works through the conversion.
| Batch of blend | Ylang Ylang Flower (50%) | Vanilla Bean (30%) | Neroli (20%) | Candle weight it scents at 8% | 200 g candles |
|---|---|---|---|---|---|
| 16 g | 8.0 g | 4.8 g | 3.2 g | 0.20 kg | 1.0 |
| 100 g | 50.0 g | 30.0 g | 20.0 g | 1.25 kg | 6.2 |
| 1 kg | 500.0 g | 300.0 g | 200.0 g | 12.50 kg | 62.5 |
| 5 kg | 2,500.0 g | 1,500.0 g | 1,000.0 g | 62.50 kg | 312.5 |
The last two columns use CSI's convention: load is a share of the finished candle, so oil = total × 8% and the candle weight is oil ÷ 0.08. 5 kg of blend scents 62.5 kg of finished candles, made of 5 kg of oil and 57.5 kg of wax. If you instead add oil as 8% of the wax weight, 5 kg of oil would go into 62.5 kg of wax, a true load of 7.41%. Both are valid if you use them consistently; the problem is mixing them between the test batch and production. Is 8% applied to each oil or to the blend? and calculating a 10 kg batch without making 10.8 kg cover the conventions.
Weighing error, in numbers
Every digital scale shows weight in fixed steps, its readability: 1 g on many workshop scales, 0.1 g or 0.01 g on finer ones. A reading can be off by up to half a step from the true weight, before any other error. CSI does not publish the readability of its scale in our data, so check the label or the product page for yours. The table shows what half a step means for each component of the example blend, at two readabilities.
| Batch | Component | Target | 1 g scale (±0.5 g) | 0.1 g scale (±0.05 g) |
|---|---|---|---|---|
| 16 g | Ylang Ylang Flower | 8.0 g | ±6.25% | ±0.625% |
| 16 g | Vanilla Bean | 4.8 g | ±10.42% | ±1.042% |
| 16 g | Neroli | 3.2 g | ±15.62% | ±1.562% |
| 100 g | Ylang Ylang Flower | 50.0 g | ±1.00% | ±0.100% |
| 100 g | Vanilla Bean | 30.0 g | ±1.67% | ±0.167% |
| 100 g | Neroli | 20.0 g | ±2.50% | ±0.250% |
| 5 kg | Ylang Ylang Flower | 2,500.0 g | ±0.02% | ±0.002% |
| 5 kg | Vanilla Bean | 1,500.0 g | ±0.03% | ±0.003% |
| 5 kg | Neroli | 1,000.0 g | ±0.05% | ±0.005% |
Read the table from top to bottom and the pattern is clear. The 16 g blend inside a single test candle is the least accurate batch you will ever make: on a whole-gram scale, the 3.2 g of Neroli could be 15.6% out. The 100 g test blend is better. The 5 kg batch is the best by far: ±0.05% on the smallest component. In the worst case, with Neroli reading high and the other two low, the 100 g batch's Neroli share could drift from 20.0% to about 20.60%; at 5 kg, to about 20.012%. Scaling up does not threaten your ratio. Scaling up carelessly does.
Weighing 5 kg without drift
Cumulative addition is the standard way to weigh a multi-component batch. Place a clean, dry vessel large enough for 5 kg plus stirring room on the scale and tare it to zero. Pour the first component to its target. Do not re-tare. Pour the second component until the display shows the running total, and the third until it shows the batch total. Every oil goes straight from its bottle into the vessel, so nothing is lost in intermediate cups, and the vessel is weighed once at the start rather than three times.
| Step | Add | Component target | Display should read | Working tolerance (example) |
|---|---|---|---|---|
| 0 | Tare the empty vessel | — | 0 g | Exactly 0 |
| 1 | Ylang Ylang Flower | 2,500 g | 2,500 g | ±5 g (0.2%) |
| 2 | Vanilla Bean | 1,500 g | 4,000 g | ±3 g (0.2%) |
| 3 | Neroli | 1,000 g | 5,000 g | ±2 g (0.2%) |
The tolerance column is a working example, 0.2% of each component, which a whole-gram scale can hold comfortably at this scale. Set your own and write it on the sheet. What matters is what you do when a pour goes past the tolerance. Never pour oil back into the stock bottle or scoop it out: that contaminates the stock and loses oil on the scoop. Instead, recalculate the remaining components from the actual figure. If Ylang Ylang lands at 2,512 g instead of 2,500 g, the blend now needs Vanilla Bean at 2,512 × 30 ÷ 50 = 1,507.2 g and Neroli at 2,512 × 20 ÷ 50 = 1,004.8 g. The batch becomes 5,024.0 g at exactly 50/30/20. That works only if you have that much of each remaining oil to hand, which is one reason to buy a small margin over the plan.
If the vessel plus 5 kg would exceed your scale's capacity, make the batch as two 2.5 kg sub-batches weighed the same way (1,250 g, then 2,000 g, then 2,500 g on the display), and combine them in a larger container before the final mix. Each sub-batch is independently in ratio, so combining them keeps the ratio. Do not weigh a single component in several separate lots and add them up; each lot adds its own rounding and handling error. Premixing a production concentrate covers storing and dosing the finished batch.
The master weighing sheet
Every production batch of a blend should leave behind one sheet, filled in as the oils are weighed, not afterwards. It is the only record that tells you, months later, whether a batch that smells different was weighed differently. Documenting a custom formula covers the formula card this sheet refers to.
| Field | Entry |
|---|---|
| Blend name and version | Example: Floral Vanilla v1.2 |
| Batch size and date | 5,000 g · date · batch number |
| Scale used, readability, capacity checked | Scale ID · 1 g · capacity checked ✔ |
| Vessel tared | Vessel ID · 0 g |
| Ylang Ylang Flower: target / cumulative / actual / lot / initials | 2,500 g / 2,500 g / ____ / ____ / ____ |
| Vanilla Bean: target / cumulative / actual / lot / initials | 1,500 g / 4,000 g / ____ / ____ / ____ |
| Neroli: target / cumulative / actual / lot / initials | 1,000 g / 5,000 g / ____ / ____ / ____ |
| Recalculations (if any) | Actual first component · new targets |
| Final batch weight | ____ g |
| Mixed for / by | ____ minutes · initials |
| Retained sample | ____ g · location |
| Blotter check vs previous retained sample | Match / differs — notes |
The lot column matters more than it looks. When a new bottle of one component arrives and the blend smells slightly different, the sheet tells you exactly which batches used which lot. CSI does not publish batch-consistency data; keep a retained sample of each lot and ask on WhatsApp about any change. Comparing a new batch of a scent covers that check.
Pilot at 1 kg, check against the retained sample
If a blend has only ever been made at 100 g, make a 1 kg pilot before the first 5 kg. It costs ₹6,415.04 for the example blend, scents 12.5 kg of candles (62.5 × 200 g), and tests your method and your vessel at a scale where a mistake is affordable. Pour a few candles from it beside a candle made from the original 100 g blend and compare them blind at the same cure age.
| Component | Quantity | Line total |
|---|---|---|
| Ylang Ylang Flower 500 g | 500 g (50%) | ₹2,714.00 |
| Vanilla Bean 3 × 100 g | 300 g (30%) | ₹2,370.00 |
| Neroli 2 × 100 g | 200 g (20%) | ₹1,331.04 |
| Total | ₹6,415.04 |
The pilot also shows up differences that are not about weighing at all. Larger batches of wax take longer to melt and cool, stirring is harder, and pouring takes longer, so a blend that behaved perfectly in a 100 g jug can behave differently in a 10 kg melter. What changes when you scale from 1 kg to 25 kg and why a production batch can smell weaker cover those production variables. Before any 5 kg batch goes into wax, dip a blotter in it and in the retained sample from the approved batch; if they do not match, stop and find out why.
| Pack | Price | Per gram | Share of a 5 kg batch covered |
|---|---|---|---|
| 15 g | ₹106.20 | ₹7.08 | 1% |
| 50 g | ₹330.40 | ₹6.61 | 2% |
| 100 g | ₹590.00 | ₹5.90 | 4% |
| 500 g | ₹2,714.00 | ₹5.43 | 20% |
| 1 kg | ₹5,310.00 | ₹5.31 | 40% |
| Pack | Price | Per gram | Share of a 5 kg batch covered |
|---|---|---|---|
| 15 g | ₹130.00 | ₹8.67 | 1% |
| 50 g | ₹410.00 | ₹8.20 | 3% |
| 100 g | ₹790.00 | ₹7.90 | 7% |
| 500 g | ₹3,840.00 | ₹7.68 | 33% |
| 1 kg | ₹7,646.00 | ₹7.65 | 67% |
| Pack | Price | Per gram | Share of a 5 kg batch covered |
|---|---|---|---|
| 15 g | ₹118.00 | ₹7.87 | 2% |
| 50 g | ₹342.20 | ₹6.84 | 5% |
| 100 g | ₹665.52 | ₹6.66 | 10% |
| 500 g | ₹3,327.60 | ₹6.66 | 50% |
| 1 kg | ₹6,655.20 | ₹6.66 | 100% |
Shopping list: 5 kg of the example blend
The list buys exactly 2,500 g, 1,500 g and 1,000 g in the listed pack sizes. Ylang Ylang Flower is one of the oils where the kilo is genuinely cheaper per gram (₹5.31/g against ₹5.90/g at 100 g), so the kilos are the right buy; Vanilla Bean and Neroli are priced almost flat above 100 g. To leave room for an overshoot correction and a retained sample, add a 100 g of each: ₹590.00, ₹790.00 and ₹665.52.
| Item | Quantity | Line total |
|---|---|---|
| Ylang Ylang Flower 2 × 1 kg + 500 g | 2,500 g (50%) | ₹13,334.00 |
| Vanilla Bean 1 kg + 500 g | 1,500 g (30%) | ₹11,486.00 |
| Neroli 1 kg | 1,000 g (20%) | ₹6,655.20 |
| Candle Making Weighing Scale | 1 (check its capacity and readability) | ₹354.00 |
| Bamboo Stirring Sticks pack of 50 | 1 | ₹1,062.00 |
| Total | ₹32,891.20 |
The oils alone are ₹31,475.20, which is ₹6.30 per gram of blend and ₹100.72 of oil in each 200 g candle at 8%. To pour all 312.5 candles you would also need 57.5 kg of wax: in Luxury Soy Wax Chunks, five 10 kg bags and one 5 kg bag plus five 500 g bags (₹34,485.00), or ask on WhatsApp for a quote on the full quantity. CSI's listed wax packs stop at 10 kg.
CANDLEMAKINGSUPPLIESINDIA supplies raw materials, not finished candles, and it does not sell a blending service. CSI sells single fragrance oils; any blend you build from them is your formula. On a page about scaling, it would be easy to sell a new scale. The page says a whole-gram scale is already accurate enough for a 5 kg batch, and that capacity, method and records matter more.
Every oil and wax price on this page is CSI live pricing, pulled on 24 September 2026. Wick, jar, scale and thermometer prices are those verified for Blog 760 on 10 September 2026; the jug, stirring sticks and other equipment were pulled on 24–25 September 2026. Out-of-stock sizes are flagged, never offered as buyable. Grams, ratios, per-gram and per-candle figures are plain arithmetic on those prices, shown to two decimals so you can check them. Weighing-error figures are arithmetic on an assumed readability (1 g or 0.1 g); the readability and capacity of CSI's scale are not in our data, so check the label or product page.
CSI publishes no throw, cure-time, composition or discolouration data for any individual oil, so nothing here ranks oils by performance. Test ratios, cure checkpoints and tolerances are labelled working assumptions for your own trials, not specifications. For MSDS and IFRA documentation, a restock date, or a quote on a production quantity of any component, message us on WhatsApp at +91 7397976926.
Frequently asked questions
- I Need 10 Kg of a Custom Fragrance Blend for Production — Should I Premix the Entire Fragrance Concentrate Before Adding It to Wax or Blend Each Component Directly into the Wax?
- How Do I Document a Custom Candle Fragrance Formula so My Production Team Can Reproduce the Same Scent and Strength Every Time?
- I'm Developing a Signature Fragrance for My Candle Brand — Should I Finalise the Fragrance Blend First or Optimise Its Wax and Wick Performance Simultaneously?
- I Want to Create My Own Signature Candle Fragrance Using Ready-Made Fragrance Oils — How Many Components Should I Start with Before Making the Blend Too Complicated?
- I Want a Candle with 50% Vanilla, 30% Coffee and 20% Caramel Fragrance Blend — How Do I Convert That Blend into Grams for a 1 Kg Wax Batch?
- I'm Blending Three Fragrance Oils for a Candle and Want an 8% Total Fragrance Load — Is 8% Applied to Each Oil or to the Combined Fragrance Blend?
- I'm Scaling from 1 Kg Test Batches to 25 Kg Commercial Batches — What Fragrance Formulation Variables Can Change Even When I Scale the Percentages Correctly?
- I'm Making 10 Kg of Scented Candles at 8% Fragrance Load — How Do I Calculate the Exact Wax and Fragrance Quantities Without Accidentally Making a 10.8 Kg Batch?
Customer reviews: The six reviews at the top of this page are genuine, published Judge.me reviews left by CSI customers on the product pages named on each card — Eco Candle Wicks, Premium Candle Wicking Needle and Bamboo Wick Holder. They are general product reviews, not assessments of the guidance set out here. Names, star ratings, dates and products are as recorded by Judge.me and wording is unedited. "Verified buyer" appears only on the three reviews Judge.me recorded as verified — Monika Deep, Subhankar Roy and Sneha Tamang; the reviews from Ashwini, LJ and Lalitha Jagan are published but not recorded as verified, and carry no badge.
Figures pulled 24 September 2026, CSI live pricing: Fragrance oils (size by size, as quoted on this page): Ylang Ylang Flower ₹106.20 / 15 g, ₹330.40 / 50 g, ₹590.00 / 100 g, ₹2,714.00 / 500 g, ₹5,310.00 / 1 kg; Vanilla Bean ₹130.00 / 15 g, ₹410.00 / 50 g, ₹790.00 / 100 g, ₹3,840.00 / 500 g, ₹7,646.00 / 1 kg; Neroli ₹118.00 / 15 g, ₹342.20 / 50 g, ₹665.52 / 100 g, ₹3,327.60 / 500 g, ₹6,655.20 / 1 kg; Eucalyptus Spearmint ₹68.44 / 15 g. Wax, equipment and other catalogue items pulled 24–25 September 2026: Bamboo Stirring Sticks ₹1,062.00 / pack of 50; Luxury Soy Wax Chunks ₹5,999.00 / 10 kg; Luxury Soy Wax Chunks ₹2,995.00 / 5 kg; Luxury Soy Wax Chunks ₹299.00 / 500 g; Candle Wax Pouring Jug ₹531.00 / each; Bamboo Stirring Sticks ₹118.00 / pack of 5. Figures verified 10 September 2026 (Blog 760): Candle Making Weighing Scale ₹354.00 / each.
Non-price figures and assumptions: Load is a share of the finished weight (oil = W × L): 5 kg of oil at 8% scents 62,500 g of candles (312.5 × 200 g) with 57,500 g of wax; if 8% is taken of wax weight instead, 5 kg of oil goes into 62,500 g of wax (true load 7.41%). Rounding error is taken as ± half the scale's readability, shown for assumed readabilities of 1 g and 0.1 g; CSI's scale readability and capacity are not in our data. Worst-case share drift assumes the smallest component reads +d/2 and the others −d/2 each. The 0.2% tolerance, the 3-minute mix, the 30–50 g retained sample and the 2,512 g overshoot are working examples. The wax pack combination for 57.5 kg uses listed Luxury Soy Wax Chunks packs. Prices and availability change — the linked product pages are always authoritative.