My 200 g Candle Uses 8% Fragrance Oil — How Do I Calculate the Exact Wax and Fragrance Cost Per Candle Instead of Treating the Entire 200 g as Wax?

Why the divisor is 1.08 and not 0.92

Start with what the 8% is a percentage of. Across CSI product pages, and across the trade generally, a fragrance load is stated as a percentage of total wax weight. The Roasted Coffee Fragrance page says soy candles at 6–10% of total wax weight. That wording is not decoration: it tells you that the oil is added to the wax, so the finished fill is always heavier than the wax you weighed out.

Write it as a little algebra and the division falls out. Call the wax w. The oil is 0.08w. The fill is w + 0.08w, which is 1.08w. You know the fill — it is the 200 g in your question — so w = 200 ÷ 1.08 = 185.19 g, and the oil is the remainder, 14.81 g. Check it the other way round: 14.81 ÷ 185.19 is 0.08 exactly. That is the whole method, and it works at any load — divide by 1 plus the load written as a decimal.

The tempting alternative is to take 8% off the 200 g: 200 − 16 = 184 g of wax with 16 g of oil. It is tidy, it is quick, and it is a different candle. On those two numbers the load is 16 ÷ 184 = 8.70% of wax weight, not 8%. The costing difference is small. The formulation difference is not: on a wax whose ceiling you have not confirmed, drifting seven-tenths of a percentage point upward without meaning to is exactly how a batch starts sweating in an Indian May. This page uses 200 ÷ 1.08 throughout and states the reading in every table: 200 g is what ends up in the jar.

What those two grams figures cost on real materials

Your question gives a fill weight and a load but no rates, so this page prices both lines on live CSI stock rather than invent a number for you. The wax is Eco Soy CSI 400, bought as the 1 kg pack at ₹399.00, which is ₹399.00 a kilogram or ₹0.40 a gram. The fragrance is Roasted Coffee Fragrance, bought as the 1 kg pack at ₹3,738.00, which is ₹3.74 a gram. Both are September 2026 prices, inclusive of taxes. If your own rates differ, substitute them — the method below does not change.

185.19 g of wax at ₹0.40 a gram is ₹73.89. 14.81 g of oil at ₹3.74 a gram is ₹55.38. The scented wax inside your candle is ₹129.27. Read the proportions before you read the total, because they are the reason this page exists: the fragrance is 7.4% of the grams and 42.8% of the rupees. A gram of this oil costs about nine and a half times what a gram of this wax costs, so any method that quietly converts oil grams into wax grams flatters your cost sheet.

The last row is the one to take seriously. ₹4,946.67 across a hundred candles is not a rounding difference — it is a month of margin for a small D2C brand running one Instagram launch at a time. And it compounds in the wrong direction, because the maker who under-costs is also the maker who under-prices, then wonders why a sold-out drop left no money behind.

One rate for the mixture, reusable on every size you pour

Everything above can be collapsed into a single number, and once you have it you never do the division again. A gram of finished fill at load L is made of 1 ÷ (1+L) grams of wax and L ÷ (1+L) grams of oil, so its cost is simply the wax rate plus the load times the oil rate, all divided by 1 plus the load. On these materials: (₹0.40 + 0.08 × ₹3.74) ÷ 1.08 = ₹0.65 a gram of fill.

That rate is the working tool. A jar that finishes at 150 g costs ₹96.95 of scented wax; one that finishes at 300 g costs ₹193.90. No re-derivation, no second guess about which 200 g you meant, because the rate is defined per gram of what is actually in the jar. The one thing it is not portable across is the load: at a different percentage the mixture is a different mixture and the rate changes. Keep one rate per recipe and label it with its load and its date.

What the wrong reading makes you order

The fill split is not only a costing question; it is a buying question, and that is where it gets expensive. A hundred 200 g candles at 8% need 18.52 kg of wax and 1.48 kg of oil. Read the 200 g as wax instead and you will order 20.00 kg and 1.60 kg — 1.48 kg of wax and 118.52 g of oil more than you will pour. On the wax that is an inconvenience; on the oil it is ₹443.02 of a single scent sitting in a cupboard, and fragrance oil does not get better with age in an Indian summer store room.

Now go the other way, because the same arithmetic saves you from a worse mistake. Working backwards from stock: one kilogram of Roasted Coffee Fragrance at 14.81 g a candle scents 67.5 candles, and those candles need 12.50 kg of wax to go with them. If you had used the all-wax figure you would have thought a kilogram of oil went further or shorter than it does, and ordered wax against a fiction. Match the two orders to each other, not to a round number.

Pack size, parcel weight and the two savings that are real

The instinct after any costing exercise is to go and buy a bigger pack. It is worth being precise about what that does on this store, because the honest answer is split. On Eco Soy CSI 400 the rate does not improve with size: the 1 kg pack works out at ₹399.00 a kilogram and the 5 kg pack at ₹399.20 a kilogram, so the larger pack is ₹0.20 a kilogram dearer, not cheaper. Buy the 5 kg because it is one parcel and one handling, not because you expect a rate.

On Roasted Coffee Fragrance the ladder is real and it is mostly at the bottom. The 15 gm trial size is ₹6.21 a gram, the 50 gm is ₹4.60, the 100 gm is ₹3.90, the 500 gm is ₹3.78 and the 1 kg is ₹3.74. In candle terms, moving from the 100 gm pack to the 1 kg pack takes ₹2.40 off each candle; moving from the 500 gm to the 1 kg takes only ₹0.62 off. Most of the prize is collected by the time you reach the 100 gm pack. Not every oil on the store behaves this way — on many the rate per gram is identical from 50 gm upward — so check the ladder on the oil you buy rather than assuming one exists.

Set the per-candle prize against the commitment before you reach for the kilogram. Ten 100 gm packs of Roasted Coffee Fragrance come to ₹3,900.00 against ₹3,738.00 for the kilogram, so the whole prize for committing is ₹162.00 — and the kilogram asks you for ₹3,348.00 more in one go than the 100 gm pack does. At 14.81 g a candle a kilogram is 67.5 candles of one scent. If coffee is proven in your range, take the kilogram. If it is a Diwali experiment, the 100 gm pack is the cheaper mistake.

What the ₹129.27 deliberately leaves out

₹129.27 is the scented wax and nothing else. Your vessel, your wick, your label, your box and your courier are all real, and adding them is the next job rather than this one — the live guide to wax, fragrance, wick, jar and packaging cost per candle walks the whole bill. CSI sells wax, fragrance, vessels and wicks, so those lines can be priced from a live store. Nothing else below is a CSI product, which means no honest number for it exists here. Copy the table, put your own figures in the blanks, and total the sheet as materials from CSI plus your own costs.

Two of those blanks deserve a sentence. Wastage is not a number this page will invent, and it is not zero: wax clings to the jug, a pour gets abandoned, a wick sits crooked and the candle is a second. This page assumes none, so ₹129.27 is a floor and your real figure sits above it. Measure it once across a full batch — the wax you started with against the candles you ended with — and you will own a percentage worth more than any figure quoted online. Your labour is the line makers leave blank longest. Leaving it blank is a decision, not a neutral act, and it is the decision that makes a busy Diwali season feel like a loss.

One more honest note about the load itself. Eco Soy CSI 400 does not publish a maximum fragrance load on its product page, so this page does not state one. The Roasted Coffee Fragrance page states 6–10% of total wax weight for soy candles, and where a wax ceiling and an oil range differ the lower figure governs — here there is only one published figure to work to. At 8% you are inside it. Before you go higher on this pairing, ask on WhatsApp and run a burn test rather than reading a number off a different wax's page.

Frequently asked questions