How Many Bottles Does a 300ml Reed Diffuser Refill Actually Fill?

How Many Bottles Does a 300ml Reed Diffuser Refill Actually Fill?

★ ★ Bottle-size maths · what 300ml physically fills50ml ₹749 · 130ml ₹1,249 · Duo ₹1,498 · Sukoon ₹1,899A portion funds girl-child education
★ Sizing and quantity · counting fills
Two 130ml fills with 40ml left over, or exactly six 50ml fills — and the 40ml is where plans go wrong
300ml ÷ 130ml = 2.3. That is two complete 130ml fills and about 40ml left in the container.
The 130ml count
Two fills, plus 40ml
300ml ÷ 50ml = 6 exactly. A 300ml refill fills six 50ml bottles with nothing left over.
The 50ml count
Six fills, no remainder
Two 130ml fills is about 32 weeks in one room. The spare 40ml adds roughly five more. About 37 weeks in total.
What that is in weeks
About 37 weeks
Poured into 50ml bottles the same 300ml gives about 42 weeks — a smaller bottle draws roughly 7ml a week against a 130ml's 8ml.
Why the count changes the weeks
42 weeks in 50ml
A refill fill of a 130ml costs ₹1,040 of liquid against ₹1,249 for a new bottle. A 50ml fill costs ₹400 against ₹749.
Cost per fill
₹1,040 and ₹400
A refill contains no glass, no collar and no reeds. Six fills would otherwise have arrived with thirty-six new reeds. Plan for that.
What is not in the box
No reeds included
300ml ÷ 130ml = 2.3. That is two complete 130ml fills and about 40ml left in the container.
The 130ml count
Two fills, plus 40ml
300ml ÷ 50ml = 6 exactly. A 300ml refill fills six 50ml bottles with nothing left over.
The 50ml count
Six fills, no remainder
Two 130ml fills is about 32 weeks in one room. The spare 40ml adds roughly five more. About 37 weeks in total.
What that is in weeks
About 37 weeks
Poured into 50ml bottles the same 300ml gives about 42 weeks — a smaller bottle draws roughly 7ml a week against a 130ml's 8ml.
Why the count changes the weeks
42 weeks in 50ml
A refill fill of a 130ml costs ₹1,040 of liquid against ₹1,249 for a new bottle. A 50ml fill costs ₹400 against ₹749.
Cost per fill
₹1,040 and ₹400
A refill contains no glass, no collar and no reeds. Six fills would otherwise have arrived with thirty-six new reeds. Plan for that.
What is not in the box
No reeds included
SOSA reed diffusersReeds from ₹749 SOSA Day and Night reed diffuser duoDuo ₹1,498 SOSA Sukoon 500ml ultrasonic diffuserSukoon ₹1,899 SOSA reed diffuser refillsRefill ₹2,399 SOSA Hotel Collection fragrancesScents ₹299
★ See the reed diffusers from ₹749 Two rooms — the duo ₹1,498
✓ Honest coverage figures — six reeds, up to about 150 sq ft, not "a whole home" ✓ 50ml ₹749 for 6–8 weeks · 130ml ₹1,249 for 14–18 · every total on this page adds up ✓ Most homes need fewer units than they expect — we will say so

 

Founder Diaries · Sizing and quantity
By Sonal Sahani · ISIPCA Versailles 9 min read Updated August 2026
Three hundred millilitres divided by 130 is 2.3. So a 300ml refill gives you two complete 130ml fills and about 40ml left in the container — or, if you pour it into 50ml bottles instead, exactly six fills with nothing over. Those two counts buy different numbers of weeks, and the 40ml remainder is the part almost everyone forgets to plan for.
Quick answers — read this first
Into 130ml bottles: two full fills (260ml) with about 40ml left. Roughly 37 weeks of use in one room.

Into 50ml bottles: six fills exactly (300ml). Roughly 42 weeks, because a 50ml gives up about 7ml a week against a 130ml's 8ml.

Into a 500ml refill instead: three 130ml fills with 110ml over, or ten 50ml fills exactly.

What is not included: glass, collars and reeds. A refill is liquid only.
The short answer
Short answer: A 300ml refill fills a 130ml bottle twice, with about 40ml left over, or a 50ml bottle exactly six times. 300 ÷ 130 = 2.3 and 300 ÷ 50 = 6. The 500ml refill fills a 130ml three times with 110ml over, or ten 50ml bottles.
In weeks rather than fills: Two 130ml fills on six reeds is about 32 weeks in one room, and the leftover 40ml adds roughly five more — call it 37 weeks. The same 300ml poured into 50ml bottles gives about 42 weeks, because a smaller bottle keeps fewer reeds fully wetted and gives up around 7ml a week against a 130ml's 8ml. More weeks, but six refilling jobs instead of two.
What it does not fill: A Sukoon or any other ultrasonic tank. Reed refill is oil-based; the machines take the water-based Hotel Collection, and the two are not interchangeable in either direction. A reed refill goes into reed glass and nowhere else.
In this guide
The unit
One reed diffuser · from ₹749
Two rooms
Day & Night duo · ₹1,498
Large rooms
Sukoon 500ml · ₹1,899
Straight answer
How many bottles will one 300ml reed diffuser refill fill?
1. Two 130ml bottles, with about 40ml over. 300 divided by 130 is 2.3. Two complete fills use 260ml and leave 40ml in the container. That remainder is not a rounding error — it is about five weeks of use and roughly ₹320 of fragrance at refill prices, so it is worth deciding in advance where it goes rather than discovering it nine months later at the back of a cupboard.

2. Or six 50ml bottles, exactly. 300 divided by 50 is 6, with no remainder at all. If your home runs on 50ml bottles — a bathroom, a small study, a bedside — one refill restocks six of them. That is the tidiest version of the arithmetic and, per bottle, the biggest saving: a 50ml fill costs ₹400 of liquid against ₹749 for a new bottle, where a 130ml fill costs ₹1,040 against ₹1,249.

3. In weeks, the two counts are not equal. Two 130ml fills run about 16 weeks each, so 32 weeks, plus about five from the 40ml — roughly 37 weeks. Six 50ml fills run about 7 weeks each, so roughly 42 weeks. The same 300ml buys about five more weeks in the smaller glass, because a 50ml on six reeds gives up around 7ml a week and a 130ml around 8ml. You pay for it in effort: six refilling jobs rather than two.

4. The 500ml scales the same way. A 500ml refill at ₹3,499 fills a 130ml three times with 110ml over, or ten 50ml bottles exactly. That is ₹7.00 a millilitre against ₹8.00 for the 300ml and ₹9.61 for a 130ml bottle. It only makes sense for a household running four or more bottles of the same blend, because 500ml is roughly 62 weeks of one room.

5. It fills bottles, not rooms. A 130ml topped up from a refill holds exactly the same closed, still room of up to about 150 sq ft on six reeds as one bought full. The refill changes how many weeks you get, not how far the scent reaches. If a room is bigger than one bottle holds, no amount of refilling will close the gap — that needs a second position or a machine.

Made in India, composed by an ISIPCA Versailles-trained perfumer — and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: a 300ml refill fills a 130ml bottle twice with about 40ml left over, or six 50ml bottles exactly. That is roughly 37 weeks of one room in 130ml glass, or about 42 in 50ml. A 500ml fills a 130ml three times with 110ml over. Refills contain liquid only — no glass, no collars, no reeds — and they change the weeks, not the coverage.
SOSA reed diffuser refills
Two fills, plus forty millilitres
300ml Refill ₹2,399
A 300ml refill at ₹2,399 fills a 130ml bottle twice with about 40ml over, or six 50ml bottles exactly — ₹8.00 a millilitre against ₹9.61 in a bottle. The 500ml at ₹3,499 is ₹7.00. Liquid only: keep the glass and the spare reeds from your last bottle.
See refills →

Why 2.3 fills is a more awkward number than it looks

The clean version of this sum is the 50ml one: 300 divided by 50 is six, and six bottles is six bottles. The 130ml version is not clean. 300 ÷ 130 = 2.3, which is two fills and 40ml you have to do something with. Forty millilitres is not trivial — at 8ml a week it is about five weeks of a room, and at ₹8.00 a millilitre it is roughly ₹320 of fragrance. The trouble is that it does not fill anything on its own. It is four-fifths of a 50ml bottle, or a top-up for a 130ml that is running low, or the awkward inch at the bottom of a container that gets pushed behind the cleaning things. Which of those it becomes is the difference between the refill saving what the arithmetic says and saving noticeably less.

The second surprise is that pouring the same 300ml into smaller bottles buys more weeks, not fewer. A 50ml on six reeds runs 6–8 weeks, which is roughly 7ml a week; a 130ml on the same six reeds runs 14–18, which is roughly 8ml. The reeds set the rate, and a fuller bottle keeps them wetted a little more thoroughly, so it works marginally harder. Six 50ml fills therefore add up to about 42 weeks against about 37 for the 130ml route. That is not an argument for buying 50ml bottles — they are far dearer to buy in the first place, at ₹14.98 a millilitre against ₹9.61 — but if you already own several, it is a genuine reason to pour a refill into them rather than into one large bottle.

Three ways to pour one 300ml refill

1
POUR ONE · INTO ONE 130ML, TWICE
Two fills, 40ml spare, about 37 weeks
SOSA reed diffuser refills300ml refill₹2,399The commonest case: one room, one 130ml bottle, one scent. Fill it, run it about sixteen weeks, fill it again, run another sixteen. That is 260ml used and 40ml left, which is about five weeks more if you top the bottle up mid-cycle rather than waiting for it to empty. Buying those two fills as new bottles would be ₹2,498 against ₹2,399 for the refill — only ₹99 apart — but you also keep the spare 40ml, which is where the real difference sits.
The check: 2 × 130ml = 260ml · 300 − 260 = 40ml · 2 × ₹1,249 = ₹2,498 against ₹2,399.
2
POUR TWO · INTO SIX 50ML BOTTLES
Exactly six, nothing left, about 42 weeks
If your home runs on small bottles — a bathroom on three reeds, a study, a bedside — 300ml restocks six of them with no remainder. Per bottle this is the largest saving in the range: 50ml of liquid from a refill is ₹400 against ₹749 for a new 50ml. Six fills would otherwise cost ₹4,494, so the refill saves roughly ₹2,095. The catch is reeds. Six new bottles would have arrived with thirty-six fibre reeds; a refill arrives with none, and clogged reeds are the commonest reason throw fades after a few months.
The check: 6 × 50ml = 300ml · 6 × ₹749 = ₹4,494 against ₹2,399 · saving ₹2,095.
3
POUR THREE · ACROSS TWO ROOMS AT ONCE
One fill each, and a spare 40ml
Two 130ml bottles in two rooms, both filled from the same container, both running roughly sixteen weeks. That uses 260ml, leaves the same 40ml, and gets you back to a single reorder for two rooms instead of two separate ones. It also halves the commitment problem: 300ml is about nine months of one room but only about eighteen weeks across two, so you are not betting on liking the same blend for the better part of a year. This is the household a 300ml is genuinely priced for.

Sizing by space — how the fills land in a real home

Find the bottles you actually own in the left column. The cost is what the refill costs, and one row here is worth nothing at all, because that space does not need filling.

The fill table
What 300ml fills, and what that is in weeks
Space What it needs How many Cost
One 130ml bottle, one room, one scent ★ Two full fills and 40ml over — about 37 weeks of use before you order again Fills it twice ₹2,399
Two 130ml bottles, two rooms, same blend One fill each with 40ml spare — about 16 weeks in each room from a single order Fills both once ₹2,399
A home running several 50ml bottles Exactly six fills, no remainder, about 42 weeks in total — the biggest saving per bottle in the range Fills six ₹2,399
One 50ml bottle and nothing else Six fills is far more than you will use before you tire of the scent — buy a 130ml instead Do not buy a refill yet from ₹1,249
Four or more bottles of one blend The 500ml — three 130ml fills with 110ml over, or ten 50ml fills, at ₹7.00 a millilitre 500ml refill ₹3,499
An empty bottle standing in a corridor or an unused guest room Nothing. Filling a bottle nobody walks past converts fragrance into evaporation and no one is there for either None ₹0
A note on all of the above: week figures assume six reeds, a closed room and standard ceiling height — roughly 7ml a week from a 50ml and 8ml from a 130ml. Fewer reeds stretches every figure above; heat and draughts shorten them.
Shop this guide
Two fills, six fills, and the forty millilitres in between
SOSA reed diffusersOne room · the unitFrom ₹749Shop → SOSA reed diffuser duoTwo rooms · better value₹1,498Shop → SOSA Sukoon ultrasonic diffuserLarge room · a switch₹1,899Shop →
The SOSA principle
300ml fills a 130ml twice. The 40ml left over is where most refill plans quietly fail.
Forty millilitres is about five weeks of a room and roughly ₹320 of fragrance. Decide where it goes before you open the container, not afterwards.

Pouring, reeds, and what to do with the remainder

Fill a clean, dry bottle to the shoulder, not to the brim. A reed diffuser needs headroom so the collar seats properly and the bottle can be moved without the oil creeping up the neck. If you are refilling a bottle that held a different scent, rinse and dry it thoroughly first — a residue of Fresh Brew under a fill of Evening Calm reads as neither for the first fortnight. Stand the bottle on a tray while you pour. Reed oil marks polished wood permanently and it is far easier to be careful for one minute than to sand a sideboard.

Fit fresh reeds at every fill, and understand that the refill does not include them. This is the hidden line in the arithmetic. Six new 50ml bottles would arrive with thirty-six fibre reeds; a 300ml refill arrives with none. Reeds clog as the heavier fragrance molecules saturate the fibre, and once they do, throw falls away regardless of how full the bottle is — which is why so many people replace liquid when they should have replaced reeds. Keep the unused sets that came with your bottles, and flip or swap the reeds at each fill rather than only when the bottle is empty.

Then use the 40ml deliberately. Three options, in order of usefulness. Top up the 130ml at around week twelve, before it runs dry, which keeps the reeds fully wetted and gets you the full five weeks out of it. Or decant it into a 50ml bottle you already own — 40ml fills four-fifths of one, which is about six weeks in a small bathroom on two or three reeds. Or, if the scent is one you use in two rooms, split it between them as a mid-cycle top-up. What you should not do is leave it in the container assuming you will remember, because ₹320 of fragrance is exactly the amount people forget about.

A refill is liquid and only liquid. The glass, the collar and the reeds were always the durable part.
— Sonal Sahani, SOSA

What to buy

If you are counting fills, you already own glass. This table is what to buy next depending on how much of it you own.

The fill edit
What each purchase gives you, in liquid and in weeks
Buy What it covers Lasts Price
One 50ml A single reed diffuser — 50ml of liquid, six reeds and a bottle for ₹749 — ₹14.98 a millilitre, the dearest way to buy fragrance 6–8 weeks from ₹749
One 130ml The value size — 130ml, six reeds and a bottle for ₹1,249 — ₹9.61 a millilitre, and the glass a refill needs 14–18 weeks from ₹1,249
The duo Day & Night duo — two bottles and twelve reeds at once, which is two fills' worth of glass for later 6–8 weeks each ₹1,498
Sukoon 500ml ultrasonic — a room past about 200 sq ft, where the problem is coverage rather than volume Runs when you switch it on ₹1,899
300ml refill ★ The running cost — two 130ml fills with 40ml over, or six 50ml fills exactly — liquid only, no glass and no reeds Roughly 2 × 130ml fills ₹2,399
Honest notes before you buy: every figure on this page is the real one and every total adds up — check them. Two things are worth saying plainly before you buy anything. First, coverage claims are steady-state figures: a reed diffuser on six reeds holds a room of up to about 150 sq ft when that room is closed and still. Open a balcony door, run a fan, or raise the ceiling to twelve feet and the same bottle covers noticeably less — not because it is weak, but because coverage is measured in a condition your home may not be in. Second, most homes need fewer units than they buy. A room nobody sits in does not need fragrance; a corridor is a transit space, not a room; and adding reeds to an existing bottle is free, while adding a bottle is not. Reed count is the volume dial — six for full strength, four for a bedroom, two or three for a small bathroom — and it is the first thing to try. SOSA reed diffusers are oil-based and composed and made in India, in Pune; the Sukoon (₹1,899) runs the water-based Hotel Collection (from ₹299) and the two liquids are not interchangeable. Both are phthalate-free and composed to IFRA standards for home diffusion, not for skin or ingestion. A portion of every order supports girl-child education through Nanhi Kali.
SOSA Day and Night reed diffuser duo
Two rooms, one purchase
Day & Night Duo ₹1,498
Two 50ml bottles — Morning Freshness and Evening Calm — at ₹1,498 against ₹1,548 bought separately. The saving is small; the real reason to buy it is that it solves two rooms at once with scents chosen to sit beside each other rather than argue.
See the duo →
SS
ISIPCA
Versailles
A note from Sonal

The honest answer to this question has a remainder in it, and I would rather print the remainder than round it away. 300ml fills a 130ml twice and leaves about 40ml. Six 50ml bottles come out exact. Those are the two counts, and everything else is what you choose to do with the forty millilitres.

The thing I would ask you to plan for is reeds. A refill is liquid and only liquid. If you are on your third fill of the same bottle with the reeds that came with it eight months ago, the bottle is not weak — the fibre is clogged. Change them, and you will get the weeks the arithmetic promised.

And I will repeat the correction this whole subject needs. Filling a bottle does not make it reach further. The same 130ml holds the same room of up to about 150 sq ft on six reeds whether the oil came from a refill or a new box. A bigger container buys weeks, not square feet, and if your living room is 220 sq ft you need a second position or a machine, not more liquid. A portion of every order funds a girl's classroom through Nanhi Kali.

Frequently asked questions

How many bottles does a 300ml reed diffuser refill fill?
Two 130ml bottles, with about 40ml left over — 300 ÷ 130 = 2.3. Or exactly six 50ml bottles, since 300 ÷ 50 = 6. A 500ml refill fills a 130ml three times with 110ml over, or ten 50ml bottles with nothing left.
How many weeks of use is a 300ml refill?
About 37 weeks in one room if you pour it into a 130ml — two fills of roughly sixteen weeks each, plus about five more from the leftover 40ml. Poured into 50ml bottles it is closer to 42 weeks, because a 50ml gives up around 7ml a week against a 130ml's 8ml.
What should I do with the 40ml left over?
Top up your 130ml at about week twelve rather than waiting for it to run dry, which keeps the reeds fully wetted. Or decant it into a 50ml bottle you already own — 40ml is four-fifths of one, roughly six weeks in a small bathroom on two or three reeds. It is about ₹320 of fragrance, so it is worth a decision.
Do reed diffuser refills come with reeds?
No. A refill is liquid only — no glass, no collar and no reeds. Bottles arrive with six fibre reeds each, so keep the unused sets. Reeds clog over months as heavier fragrance molecules saturate the fibre, and replacing them at each fill is what keeps throw where it should be.
Does refilling a bottle let it cover a bigger room?
No. A refilled 130ml holds the same closed, still room of up to about 150 sq ft on six reeds as any other bottle. Reed count, temperature and how quickly the air is replaced set the throw; the liquid only sets the number of weeks. A bigger container buys weeks, not square feet.
Counted, with the remainder shown
Two 130ml fills, or six 50ml — and 40ml either way
A SOSA 300ml reed diffuser refill is ₹2,399 and fills a 130ml bottle twice with about 40ml over, or six 50ml bottles exactly. That is ₹8.00 a millilitre against ₹9.61 in a bottle. Liquid only — keep your glass and your spare reeds. Composed and made in Pune, phthalate-free. A portion of every order supports girl-child education through Nanhi Kali.
Shop SOSA reed diffusers → See the Sukoon ₹1,899
Continue the read
More bottle-size arithmetic
Editorial standards & sources
About this guide: Written by Sonal Sahani, ISIPCA Versailles-trained founder and perfumer at SOSA Home & Body, on sizing home fragrance to a home. Coverage and longevity figures are SOSA's own for the stated products, measured on six reeds in a closed room of standard ceiling height; real rooms with draughts, heat or high ceilings will differ. Prices are current at the time of writing.

SOSA products & prices (verified August 2026): Hotel Collection water-based ultrasonic diffuser fragrance 15ml ₹299 · 100ml ₹999 · 300ml ₹1,799 · Pack of 7 (15ml, all fragrances) ₹1,799; refills 100ml from ₹999. Seven scents: The Ritz-Carlton-inspired (white tea · bergamot · cedar), Westin-inspired (white tea · aloe · cedar), 1 Hotels-inspired (cedarwood · vetiver · green leaves), The St. Regis-inspired (amber · violet · woods), Shangri-La-inspired (jasmine · green tea · white tea), Four Seasons-inspired (citrus · floral · sandalwood), W Hotels-inspired (citrus · pepper · amber). Diffusers: Boond 300ml ₹899 · Sukoon 500ml ₹1,899 · Megh 6L ₹3,499. Water-based, phthalate-free, composed to IFRA standards for home diffusion; 3–6 drops per tank. Made in India, Pune. The Hotel Collection scents are SOSA's own interpretations inspired by the world's finest hotels; all hotel names are trademarks of their respective owners and are used only to describe the scent style — SOSA is an independent Indian fragrance house, not affiliated with or endorsed by any hotel brand. Prices and availability subject to change — see the live product pages.
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