The two per-kilogram columns, side by side

Start where the complaint starts. The rate card is real, and it is worth reading properly before you panic about it.

All five stocked single essential oils are in stock in all five pack sizes this month, and above the 50 g pack every one of them holds a single rate. Lemon is ₹4,484.00 a kilogram, peppermint ₹5,900.00, lavender ₹6,844.00, ylang ylang ₹7,316.00 and marjoram ₹8,732.00. The spread from the cheapest to the dearest of the five is ₹4,248.00 a kilogram, which is itself larger than any of the gaps you are about to read against the fragrance oils. Which essential oil you have chosen matters more to your bill than the fact that it is an essential oil.

Now the counterparts. Two of the five have a same-scent fragrance oil in the range, and those are the pairs to trust. Lavender Fragrance Oil is ₹5,400.00 a kilogram at its 100 g pack against ₹6,844.00 for the essential oil, so the essential oil is 26.74% dearer — ₹1,444.00 a kilogram. Citrus Lemon Fragrance Oil is ₹3,000.00 at its 100 g pack against ₹4,484.00 for lemon essential oil, which is 49.47% dearer. Those two comparisons need no interpretation from anybody: the scent name on the label is the same and only the material differs.

The other three need a judgement, and it is worth saying whose. CSI's pages name fragrance families, not equivalences between individual products, so pairing ylang ylang with Jasmine at ₹4,300.00 a kilogram, peppermint with Eucalyptus Spearmint at ₹3,540.00, and marjoram with Sage and Cedarwood at ₹6,962.00 is editorial judgement about scent character, not a published statement that one replaces the other. Read those three rows as indicative. On them the premiums are 70.14%, 66.67% and 25.42%. And the choice of counterpart moves the answer: swap Jasmine for British Rose at ₹3,422.00 a kilogram, which is the cheaper of the two florals, and the ylang ylang premium looks larger again — which is a reason to read the column as a range rather than as a verdict.

Two of those rows are worth more attention than the headline. Marjoram essential oil is the dearest of the five at ₹8,732.00 a kilogram, and yet its premium over its counterpart is the narrowest on the table at 25.42% — because Sage and Cedarwood at ₹6,962.00 is itself one of the dearer fragrance oils in the range. At the other end, ylang ylang carries the widest premium of the five, 70.14% over Jasmine's ₹4,300.00. So the size of the difference depends as much on which fragrance oil you hold it against as on the essential oil itself: set marjoram against Citrus Lemon Fragrance Oil at ₹3,000.00 instead and it is 2.91 times the rate, a difference of ₹5,732.00 a kilogram. The range does not have one premium; it has five, and they are a long way apart.

One mechanical note on how these rates were read, because it matters if you check them. Where a product's best per-kilogram rate sits on a pack with very few units left, this page quotes the best rate among the packs it can honestly point you at. For Lavender Fragrance Oil that is ₹5,400.00 a kilogram, carried by the 50 g and 100 g packs. For lavender essential oil the question does not arise, because the rate is ₹6,844.00 a kilogram at every size and the stock is deep in all five.

The load convention, and why the denominator decides the oil line

Get this wrong and every figure downstream is wrong in the same direction, by a quarter.

CSI's reed and car diffuser base pages state fragrance load as a percentage of the total finished blend. The published figures are 10% as a starting point, 20% as the recommended working load and 30% as the maximum, with 75% base plus 25% fragrance oil given as the typical working blend and a worked example that reads: for a 100 ml finished diffuser at 25% fragrance, use 75 ml of base and 25 ml of fragrance oil. So a 100 g bottle at the recommended rung is 20 g of oil with 80 g of base; at the published start 10 g with 90 g; at the typical working blend 25 g with 75 g; at the maximum 30 g with 70 g.

The candle convention is the opposite, because there load is a percentage of the wax weight, and most Indian diffuser makers arrive from candles. So the standard costing error in this trade is dividing the oil by the base instead of by the total: 20 g of oil into 80 g of base reads as 25% against the base and 20% against the total finished blend. If you cost at 25% while CSI publishes 20%, your oil line comes out a quarter too high and your base line too low, and the comparison you are trying to make between an essential oil and a fragrance oil disappears into the arithmetic.

This is not a pedantic point on an essential oil page, it is the expensive one. The oil is the dearest thing in the bottle here, so the denominator you choose decides most of your cost. At 20% of the total blend a 100 g bottle takes 20 g of lavender essential oil, ₹136.88. At 25% read as a share of the base you would be weighing out 25 g instead, and your bill would quietly rise. Write the convention on the sheet you cost from, in the words CSI publishes it in, and the error cannot recur.

Now the part that makes this hundred of posts different from the fragrance-oil ones. Those published figures are written about fragrance oil. Every load figure in the diffuser range, the clarity step, the rest before bottling and the published family lists sit on pages that say fragrance oil. No CSI page publishes a load, a dose, a compatibility statement, a flash point, a safety data sheet, an IFRA certificate, an allergen list or a shelf life for any essential oil in a diffuser. There is no published rung for lavender essential oil, so when this page costs at 20% it is costing at a borrowed figure and saying so.

That is still the right figure to cost at, for one honest reason: it is the only published bracket in the range, so costing at it makes your numbers comparable with every other diffuser cost sheet in the trade, including the ones on CSI's own live pages. What it is not is a validated dose for your oil. The sensible order of work is to cost at the published rung to get a planning number, run a three-rung ladder to find out where your own pair actually sits, and then re-cost at the rung you can produce at. The last step is cheap: it is one multiplication.

One piece of published guidance does carry over cleanly, and the rest of this page leans on it. Four of the five base pages tell a maker what to do when a blend clouds: Lift says “If clouding occurs, the fragrance oil may not be fully compatible at that load - reduce fragrance percentage and retest.”, Softness says “If clouding occurs, the fragrance oil may not be fully compatible at that load - reduce the fragrance percentage and retest.”, Depth says “If any clouding occurs, reduce fragrance percentage and retest before proceeding to batch production.” and Longevity says “The blend should remain crystal clear. If clouding occurs, reduce fragrance percentage and retest. Heavy oils like oud can cloud at maximum load in some bases.” That is advice about a procedure rather than about a material, so it transfers honestly to an oil the pages do not cover — and it happens to be a cost instruction as well as a clarity one, because the step it sends you down is the one lever on the most expensive line in your bottle.

From per kilogram to per bottle, at each published rung

A kilogram is a frightening unit. A bottle is the unit you sell, and it divides the fear by fifty.

The arithmetic is one step. A 100 g bottle at the published 20% rung holds 20 g of oil, which is a fiftieth of a kilogram, so the oil line is the per-kilogram rate divided by fifty. Lavender essential oil at ₹6,844.00 a kilogram gives ₹136.88; Lavender Fragrance Oil at ₹5,400.00 gives ₹108.00. The base line is 80 g of a 500 ml pack at ₹2,198.00 a kilogram, which is ₹175.84, and it is the same figure in both columns because nothing about the base changed.

So the liquid in the bottle is ₹312.72 with the essential oil and ₹283.84 with the fragrance oil, a gap of ₹28.88. Run the same step at the other two published rungs and the gap scales exactly with the oil weight: ₹14.44 at the 10% rung, where the bottle holds 10 g, and ₹43.32 at the 30% maximum, where it holds 30 g. There is nothing non-linear in here. The rate gap per kilogram, divided by fifty, multiplied by the rung — that is the whole mechanism.

Which is why the rung you produce at is the single most important number in your costing, and why it is uncomfortable that nobody publishes one for an essential oil. The difference between producing at 10% and producing at 30% on lavender essential oil is ₹68.44 of oil against ₹205.32 — the liquid moves from ₹266.26 to ₹359.18. You cannot cost a product properly until you know which of those you are making, and you cannot know that until your own ladder has told you where the pair stays clear.

Choose the base and the arithmetic barely moves. Pure Performance, Depth, Lift and Softness are all ₹1,099.00 for 500 ml, so a bottle holds the same ₹175.84 of raw material in any of those four. Longevity is ₹1,296.00, which is ₹259.20 per 100 ml against ₹219.80 — ₹39.40 more per 100 ml. The Pure Performance 100 g trial pack is a different matter: at ₹325.00 it is ₹3,250.00 a kilogram, 47.86% dearer per gram than the 500 ml pack, which is the honest reason to use it for testing rather than for production.

If you want to cost from rates you negotiated yourself rather than from CSI's shelf prices, the live page that works the problem from a maker's own supplied per-kilogram rates is this walkthrough, and it does the 120 ml case. This page is doing the narrower job: what the gap between an essential oil and a fragrance oil does to that same calculation when every other line is held still.

The finished unit: glass, reeds and the part that does not move

You do not sell liquid. You sell a bottle with reeds in it, and the bottle does not care what is in it.

A finished unit on this page is one 120 ml gold reed diffuser bottle at ₹106.20, five white fibre reeds at ₹9.00 each — ₹45.00 the set — and 100 g of blend. The hardware is therefore ₹151.20, and it is the same ₹151.20 whether the blend cost ₹312.72 or ₹283.84. That single fact is what takes the sting out of the per-kilogram headline.

Add it up. The essential oil unit is ₹463.92 and the fragrance oil unit is ₹435.04, a gap of ₹28.88 — the same ₹28.88 that the liquid carried, because nothing else changed. As a percentage it is 6.64% against the fragrance oil unit, which is a long way below the 26.74% premium on the rate card. The per-kilogram gap has been divided twice on its way to the unit: once by the rung, and once by everything in the unit that is not oil.

Cost the hardware deliberately, because it is a larger share of your unit than most makers expect. The bottle and reeds are 32.59% of the essential oil unit and 34.76% of the fragrance oil one. The base is 37.9% and 40.42%. The oil is 29.51% and 24.83%. On a unit this size the glass is in the same league as the oil, and the reeds are not loose change either: five at the pack-of-25 rate are ₹10.60 each against ₹9.00 from the pack of 50 up.

Where the hardware can genuinely be cut, it is not in the oil's league. Black fibre reeds are ₹400.00 for a pack of fifty against ₹450.00 for the white, and the best rate among the packs the white reed page quotes is ₹9.00 a reed, reached at the pack of fifty and flat above it — so beyond that pack size there is no further rate to capture. The 50 ml bottle pack at ₹826.00 works out at ₹82.60 a bottle against ₹106.20 for the 120 ml, which is a real saving per unit but a smaller product.

If the unit cost has to come down to hit a selling price, do the sum from the price end rather than the cost end. The live CSI page on pricing a 120 ml diffuser to a target gross margin works the maximum raw-material cost backwards from the selling price, which is the right instrument for that question; this page's job is to tell you honestly what your essential oil version costs before you take it to that page. On these figures that is ₹463.92 a unit, ₹23,196.00 for fifty.

The finding: the oil is a bigger slice of an essential oil bottle

This is the sentence to take away. Not the premium — the share.

At the published 20% rung the oil is 43.77% of the liquid in the essential oil bottle and 38.05% of the liquid in the fragrance oil bottle. That is 5.72 percentage points, and it is the structural difference between the two products. Everything else about the two bottles is identical: the same base at ₹175.84, the same glass, the same reeds, the same 20 g and 80 g on the scale.

The share rises with the rung, in both columns, but it rises from a higher floor on the essential oil. At the published 10% rung the oil is 25.7% of the essential oil liquid against 21.44% of the fragrance oil liquid; at the published 30% maximum it is 57.16% against 51.29%. So an essential oil maker working at the top of the published band has more than half the liquid cost sitting in one ingredient, and that ingredient is the one with no published dose.

Why the share matters more than the premium: it tells you which line to work on. A business whose oil is 38.05% of its liquid can sensibly chase the base price, the glass or the freight. A business whose oil is 43.77% of its liquid is, in cost terms, an oil business, and the base and hardware savings available are small change beside the load decision. On the finished unit the same logic applies more gently, because the hardware dilutes everything: the oil is 29.51% of the essential oil unit against 24.83% of the fragrance oil one.

It also tells you where to spend your attention, not just your money. The dearest line in the bottle is the one the catalogue publishes least about, so the risk and the cost are concentrated in the same place. A failed batch at the 20% rung wastes ₹136.88 of oil per bottle; fifty of them wastes the ₹6,844.00 that fifty bottles' worth of oil costs. That is the argument for the ladder, and it is a cost argument rather than a technical one.

Keep the comparison honest in one respect, though: a share is not a verdict. Nothing here says the essential oil version is worse value, because value is about what the finished product sells for and smells like, and this page measures neither. Nor is there any safety difference to read into the price: an essential oil is not safer than a fragrance oil because it costs more or because of where it comes from, and each formulation needs its own hazard assessment, whatever limits apply to it, its own stability testing and truthful labelling.

The lever that follows, and its second leg

Less oil is cheaper. More base is not free. State both or your spreadsheet lies to you.

CSI's own published guidance, on four of the five base pages, is to reduce the fragrance percentage and retest if clouding occurs. That makes a step-down the published response to a clarity problem — and on an essential oil page it is also the only published lever on your dearest line. Step a 100 g bottle from the published 20% rung to the published 10% rung and the oil falls from ₹136.88 to ₹68.44, a saving of ₹68.44.

That is one leg. The other is that the bottle still has to be full. Dropping the load from 20% to 10% raises the base in the bottle from 80 g to 90 g, so the base line rises from ₹175.84 to ₹197.82 — ₹21.98 more. The net saving on the liquid is ₹46.46 a bottle, not ₹68.44, and the finished unit falls from ₹463.92 to ₹417.46. A spreadsheet that models the oil saving alone overstates the gain by ₹21.98 a bottle.

The third consequence is the one that catches out a production plan. A 500 ml base pack fills 6.25 bottles at the recommended rung — 6 whole ones — and 5.56 bottles at the published starting rung, which is 5 whole ones. Stepping the load down makes each base pack cover fewer bottles, because each bottle now wants more base. The oil goes further and the base does not. Working the same thing from the oil side: a kilogram of oil makes 5,000 g of finished blend at the recommended rung and 10,000 g at the starting rung.

So a step-down is a real saving and a smaller one than it looks, and it has a stock consequence in the opposite direction. None of that is an argument against it. It is an argument for doing the arithmetic on all three lines before you promise anybody a cost reduction, and for reading the result as a cost per finished bottle rather than as a cost per kilogram of oil saved.

And the step-down is only available to you if the lower rung still makes a product you are willing to sell. That is a performance question this page cannot answer and your nose can: the live CSI pages on the most economical fragrance percentage and what a drop from 25% to 20% saves across a thousand bottles own that comparison for fragrance oils, and the sibling pages in this series work the essential oil case. What belongs here is the cost mechanism: two legs, three lines, one net figure.

No quantity break above the 50 g pack, and what that changes

Every instinct a fragrance-oil buyer has about pack size is wrong on this shelf.

Read the five essential oil ladders and the usual advice stops applying. Lavender holds the same ₹6,844.00 a kilogram at the 15 g pack as it does at the kilogram: ₹102.66 for 15 g, ₹342.20 for 50 g, ₹684.40 for 100 g, ₹3,422.00 for 500 g and ₹6,844.00 for a kilogram, with the rate unchanged at every step. Peppermint behaves identically at ₹5,900.00. The rate does not improve with size on either page.

The other three step once and then stop. Lemon, marjoram and ylang ylang each carry a dearer rate at the 15 g pack — 5.26%, 8.11% and 7.53% above their own 50 g rate — and then hold one rate through the 50 g, 100 g, 500 g and 1 kg packs. Net across all five: above the 50 g pack there is no quantity break anywhere in the essential oil range.

Compare that with the fragrance oil you are used to buying. Lavender Fragrance Oil is ₹105.02 at 15 g, which is 29.65% dearer per kilogram than its 50 g pack at ₹270.00; its best rate among the packs this page quotes is ₹5,400.00 a kilogram. There is a ladder there to climb. On the essential oils there is no ladder at all, and a purchase plan built on the expectation of a bulk rate has nothing to aim at.

That reshapes the cost plan in three ways. First, your per-gram cost is settled the moment you choose the oil, so your only remaining lever is the load — which is the lever with no published figure behind it. Second, there is no reason to over-buy: ₹6,844.00 for a kilogram of lavender buys the same rate as ₹342.20 for 50 g, so the kilogram ties up money without buying a discount. Third, the cash-flow argument for buying in small quantities costs you nothing here, which is the opposite of the position on a fragrance oil.

The practical rule for an essential oil order is therefore to buy the grams the next decision needs, and buy again when the decision is made. That is a genuinely unusual thing to be able to say in a wholesale range, and it is worth saying plainly rather than hedging it: on these five pages, buying small and often carries no price penalty above the 50 g pack. For the bulk quantity question on the base, which does have a ladder, the live CSI page on 1 kg, 5 kg or 25 kg is the one to read.

When several small packs cost less than one larger pack

A flat ladder has a consequence nobody expects: the smaller packs can be the cheaper purchase outright.

Suppose you need 30 g of lavender essential oil — three 100 g bottles at the published 10% rung, say, as a sample set for a buyer. Two 15 g packs give you exactly 30 g for ₹205.32. One 50 g pack gives you more oil but costs ₹342.20, leaving 20 g unused. The small packs cover the requirement for ₹136.88 less in absolute terms, at the identical ₹6,844.00 a kilogram, because there is no quantity break being forfeited.

Note the shape of that coverage before you copy it. Two 15 g packs hold 30 g against a requirement of 30 g: they cover it exactly, with nothing to spare. A spilled vessel, a tare error or a sample a buyer wants to keep means opening a third pack. If any of that is likely, buy the third pack with the first two rather than discovering the problem at the bench — at this rate the third pack costs exactly what the first two cost per gram.

Peppermint behaves the same way for the same reason: two 15 g packs are ₹177.00 against ₹295.00 for the 50 g pack, a saving of ₹118.00 on the same 30 g requirement. Those two oils are the only ones where the trick is free, and it is free precisely because their ladders are flat from the smallest pack up.

On lemon, marjoram and ylang ylang the same purchase still costs less in absolute terms but you pay for it in rate. Two 15 g lemon packs are ₹141.60 for 30 g, where the same grams at the 50 g pack's rate would be ₹134.52 — so you are paying ₹7.08 more than the larger pack's rate for the privilege of not over-buying. Whether that is worth it depends on how certain you are that the remaining 20 g would ever get used.

The general rule, stated so you can apply it to any requirement: on a flat ladder, buy the pack combination whose total is closest to the grams you need, because the rate is the same and the only money at stake is the oil you do not use. On a stepped ladder, work out the step first — the rate penalty on a small pack can easily exceed the value of the oil you would have left over. Either way the sum takes thirty seconds and the answer changes with the requirement, so do it each time rather than adopting a habit.

Fifty bottles, priced both ways, with freight on the base

One bottle is an arithmetic exercise. Fifty is a purchase order, and purchase orders round up.

Fifty 100 g bottles at the published 20% rung need 4,000 g of base and 1,000 g of oil. The base comes in 500 ml packs, so that is 8 packs holding 4,000 g — they meet the requirement exactly, with nothing to spare, which is worth knowing before you place the order. One spill, one over-poured bottle or one retained sample and you are opening a ninth pack. The 8 packs cost ₹8,792.00.

The oil rounds just as cleanly and just as tightly: 1,000 g is 2 packs of 500 g, again with nothing to spare, at ₹6,844.00. Because the ladder is flat you could buy that as one kilogram at ₹6,844.00 instead and pay the same. The equivalent fragrance oil bill is 10 packs of 100 g at ₹5,400.00, so over fifty bottles the oil line differs by ₹1,444.00 — which is the ₹28.88 per bottle, fifty times over.

Hardware for fifty: five packs of ten 120 ml bottles hold 50 bottles for exactly the fifty you need, with nothing to spare, at ₹5,310.00; and five packs of fifty white reeds hold 250 reeds against the 250 that fifty bottles take at five apiece, again exactly, at ₹2,250.00. Three exact coverages in one order is a fragile order. If a dropped bottle or a broken reed would stop the run, buy one spare pack of each.

Now freight, and only on the base, because that is the one material in this order whose stored packed weight can be quoted honestly. One 500 ml pack is 1 kg packed and ships Standard at ₹110.00. The 8 packs for this run are 8 kg, which is ₹800.00 as a single parcel but ₹720.00 as 2 parcels — splitting saves ₹80.00. Check that before you consolidate: past a certain weight the published rate card rewards splitting rather than combining.

Put the whole thing together and the fifty-bottle run is ₹23,196.00 of finished units with the essential oil against ₹21,752.00 with the fragrance oil, a difference of ₹1,444.00. That is the number to take to a pricing conversation. The bottle-count arithmetic from a single base pack, which is the other half of this planning question, is worked in detail by the sibling page on how many 100 g bottles one 500 ml pack fills at an essential oil load, and the live CSI page on buying base for a hundred 100 ml bottles at a 20% load does the larger run.

One more line to watch if you step the load down on a run this size. Fifty bottles at the published 10% rung need 4,500 g of base rather than 4,000 g, which is 9 packs at ₹9,891.00 instead of 8 at ₹8,792.00 — ₹1,099.00 more of base — while the oil falls to 500 g, which is 1 pack of 500 g at ₹3,422.00 instead of 2 at ₹6,844.00, saving ₹3,422.00. Net, the step-down takes ₹2,323.00 off the materials for fifty bottles. It also adds a ninth base pack to the parcel: 9 kg ships for ₹800.00 against ₹720.00 for 8 kg, so ₹80.00 of the saving goes back out in freight.

What the cost arithmetic cannot tell you

Four things this page has not measured, one of which could make every figure on it irrelevant.

It has not told you whether your pair stays clear at the rung you costed. Every figure here assumes a bottle at the published 20% rung, and that rung is published for fragrance oil. If your lavender essential oil clouds at 20% in your base and you have to produce at 10%, your real unit cost is ₹417.46 rather than ₹463.92 — a better number, as it happens, but arrived at by a route you did not choose. A four-vessel bench ladder settles it: a 25 g base-only control at ₹54.95 of material plus three 25 g arms consuming 60 g of base and 15 g of oil, ₹289.49 of material in total.

That ladder is 1.25% of what fifty finished units represent, and fifty finished units are 80.13 times its cost. The four bench vessels need 85 g of base, which a single ₹325.00 trial pack covers with 15 g to spare out of 100 g. If you intend to sell an essential oil diffuser at all, that is the cheapest line item in your whole plan and the only one that protects the others.

It has not told you how the oil behaves over time either. CSI publishes no shelf life, no ageing figure and no stability data for any base or any essential oil in a diffuser, so the cost of a bottle that hazes in week three is not in any of these tables. The published 24-48 hours rest before bottling is the only duration anywhere in the process, and the sibling page on resting and reading a blend covers that schedule; what belongs here is the warning that a cost per bottle calculated on day one is a cost per saleable bottle only if the blend is still saleable later.

It has not told you what the product is worth. A dearer input is not automatically a dearer product, and the decision to use an essential oil is usually about what a maker wants to offer rather than about cost per gram. What this page gives you is the honest size of the difference — ₹28.88 a unit, 6.64% — so the decision can be made with a number instead of an impression.

And it has not given you anything to say about what the diffuser does for the person in the room, because there is nothing to say. No therapeutic, medicinal or wellness benefit belongs on your label or in your listing: CSI publishes none, this page measures none, and the claim is regulated. Nor is an essential oil safer than a fragrance oil on grounds of origin — every formulation needs its own hazard assessment, whatever limits apply to it, its own stability testing and truthful ingredient labelling. “100% Pure” is the published product title, and it is a statement about the purity of the oil rather than a claim about a finished diffuser. The base titles work the same way: Lift is published as a base for uplifting, mood-boosting scents, which describes the fragrance character the base is built to carry, not an effect on anyone breathing it.

Frequently asked questions