Four markets, four units, one question
The word changes at the border and the question underneath it does not. In a search-suggestion sweep run for this site in September 2026, the seed "1 bagger mixer" against the Philippines filled all ten of Google's autocomplete slots, and three of those ten were the same conversion asked three ways — capacity in cubic meter, how many cubic meter, volume. Run against Indonesia, the unit becomes the litre: "concrete mixer 500 liter berapa m3", with the bare seed returning capacity slots directly as 0.3–0.6 m3, 500 liter, 350 liter. Against India it returns "1 bag concrete mixer capacity" and "10 7 concrete mixer meaning", a trade designation we have not traced to any published standard. Against Mexico, "mezcladora de concreto 1 bulto". Four units in four languages, and one contractor trying to find out how much concrete he is going to get.
Source: our own record of a September 2026 autocomplete sweep, with the country setting noted against each seed. These are observed query strings, not volume estimates; no search volume is claimed for any of them.
Why the three numbers will not convert into each other
The conversion keeps coming out wrong because it is not a conversion. A bag is a mass of one ingredient. A litre, on a mixer, is the volume of a container. A cubic metre is the volume of finished concrete after it has been placed and compacted. Only the last of the three describes the thing being bought, and two of the three do not measure the same substance at all: cement is one constituent of the mix, and the rest of the volume arrives from your own aggregate pile and your own water. So a page that prints "1 bagger equals X cubic metres" is not reporting a measurement. It is reporting an assumption about a mix design it has not stated, applied to a bag whose mass it has not stated. Change either and the answer moves, which is why the pages publishing such a factor do not agree with one another.
Source: definitional — this section rests on what each unit denotes rather than on any figure, and the figures that follow it are sourced individually. The observation that the pages publishing a fixed factor disagree with one another is from the same September 2026 sweep of search results.
A cubic metre takes at least 4.4 bags of 50 kg at 20 mm aggregate, and the floor rises with the exposure class
Here is the arithmetic the marketplace pages leave out. IS 456:2000, Table 5, sets the minimum cement content for one cubic metre of concrete by exposure class: 220 kg/m³ for plain concrete in mild exposure, rising to 360 kg/m³ for reinforced concrete in extreme exposure, with clause 8.2.4.2 stating that content above 450 kg/m³ should not be used without special consideration. Those minima are stated for normal weight aggregate of 20 mm nominal maximum size, and clause 8.2.4.1 sends other sizes to Table 6 of the same standard, which raises the minimum by 40 kg/m³ for 10 mm aggregate and lowers it by 30 kg/m³ for 40 mm. Those classes are environmental — Table 3 of the same standard describes them by what the concrete is exposed to — so the same element takes more cement in a severe setting than a mild one. IS 269:1989, clause 9.1.1, puts the net quantity of cement per bag at 50 kg, and clause 9.2 permits bags of 25, 10, 5, 2 or 1 kg. Divide one by the other, at 20 mm aggregate: a cubic metre takes at least 4.4 bags of 50 kg in the mildest case and at least 7.2 in the most severe, and 450 kg/m³ is 9 bags.
The first two of those numbers are floors rather than answers, because Table 5 states minima and a real mix normally sits above the minimum. The third is the opposite end of the same range: 450 kg/m³ is the content clause 8.2.4.2 says should not be exceeded without special consideration in design, so 9 bags is a ceiling and not a floor. Read the other way round, one 50 kg bag yields at most about 0.227 m³ of mild-exposure plain concrete, at most about 0.139 m³ for reinforced concrete in extreme exposure, and about 0.111 m³ at 450 kg/m³. Three cautions belong with these figures. They are computed here from the cited clauses, not quoted from either standard. They rest on Indian standards: no Philippine or Indonesian equivalent could be fetched and read, so if your bag is not 50 kg the whole result moves. And the cement standard read here is the 1989 edition, which covers 33-grade ordinary Portland cement and may not be the current one. The net mass is printed on the bag. That is a better source than any conversion table, including this one.
Source: IS 456:2000, Table 5 (clauses 6.1.2, 8.2.4.1, 9.1.2), Table 6 (clause 8.2.4.1), clause 8.2.4.2 and Table 3, at https://law.resource.org/pub/in/bis/S03/is.456.2000.pdf — declared minimum cement contents. IS 269:1989, clauses 9.1.1 and 9.2, at https://law.resource.org/pub/in/bis/S03/is.269.1989.pdf — declared net bag mass, 33-grade ordinary Portland cement. Both fetched 2026-09-24. The bags-per-cubic-metre and cubic-metres-per-bag figures are arithmetic performed here on those declared values, not figures either standard prints.
The litres on a mixer describe the drum, not the concrete
The same trap sits inside the machine's own specification. On the SLM-18 the drum's geometric volume is 2,900 litres and the discharged concrete is 1.6–1.8 m³, which is 1,600 to 1,800 litres. The drum is therefore 1.61 to 1.81 times the size of what comes out of it, and that is not a defect: a mixing drum needs headroom above the charge for the material to tumble, and the discharge figure is what actually leaves the chute onto your formwork. It is the reason a search for "concrete mixer 500 liter berapa m3" cannot be answered with 0.5 m³. Five hundred litres describes the vessel. What you pour is a smaller number, and the gap between the two is a property of the individual machine that only the party holding its specification can tell you.
Source: the plant's declared specification for the SLM-18 — a 2,900 litre drum against 1.6–1.8 m³ discharged. The ratio between the two is worked out here. Drum volume is a declared figure on only four of the sixteen mixers in our specification set, and the SLM-18 is the one model whose specification is complete enough to publish under its own model number.
What our machines discharge, in cubic metres
Every mixer on this site is quoted by what it discharges, in cubic metres, because that is the only one of the four units that describes the concrete rather than a container or an ingredient. Six mixer models are published here and five of the six carry a declared discharge figure. The sixth does not, so its page shows none rather than a number borrowed from a sales sheet. One model, the SLM-18 at 1.6–1.8 m³, has a specification complete enough for this site to publish figures under a model number; the other five are short of required items — engine make and model, overall dimensions, operating weight, drum volume, rated power, in different combinations — so they are described at range level until those arrive. The five crawler dozers published alongside them are a different category: no drum, and no discharge figure to give.
Behind those pages sits a specification set of sixteen mixers, of which fourteen carry a real discharge figure and two do not. The fourteen run 1.0, 1.3, 1.5, 1.6–1.8, 1.8, 2.0, 2.4, 2.4, 2.5, 3.0, 3.0, 3.5, 3.8–4.0 and 4.0–4.5 m³. Three of the fourteen are ranges rather than single figures, and where a plant states a range we publish the range rather than its top. That is the ladder, and it stops where the evidence stops: the two mixers without a figure get no discharge number from us in any document, and nothing on this page is converted from litres, from a model name or from anything else. The practical use of the ladder is sizing. A pour is planned in cubic metres, so a machine that discharges 1.5 m³ and a pour that needs 4 m³ is three loads, and that arithmetic works without knowing anything about bags, litres or badges at all.
Source: the plants' declared discharge figures for the mixers in our specification set — fourteen real values across sixteen mixers, the other two recorded as unverified — and the catalogue the six model pages render from. All figures are plant-declared, not measured by us.
Why a model number is the worst unit of all, including ours
A model number is a name, not a measurement, and our own source data carries a standing instruction never to publish the number in a plant's model name as if it were the drum volume. On the SLM-18 that number is neither the drum's geometric volume nor the discharged volume, but a third figure with no physical referent. This is the unit confusion in its purest form: a buyer reads a four-digit number off a badge, takes it for litres of concrete, and sizes a pour against a figure that describes nothing he can pour. It is also why the model pages on this site publish drum volume and discharge as two separate rows, each with its own source, and publish neither where the plant has not declared it. The badge is the one number on a machine that nobody has to stand behind.
Our own naming is not exempt from that criticism. The site's models are named for discharge multiplied by ten, which takes the top of the range: the machine called SLM-18 is specified at 1.6–1.8 m³, while the commercial sheet for the same machine reports the single figure 1.8. On four of the sixteen mixers the two documents disagree. On two of them the commercial sheet takes the top of the specification's range. On the other two it supplies a discharge figure the specification sheet does not carry at all, and where that happens we publish nothing rather than the commercial number. Where the difference matters on site, ask for the weighed batch rather than the badge: an electronic hydraulic weighing system is standard equipment on one mixer in our set, a listed option on six more, and not recorded either way on the remaining nine.
Source: the plants' declared specifications set against the commercial capacity figures for the same machines, which disagree on four of the sixteen mixers; the plants' standard-equipment and optional-equipment lists; and this site's naming rule, SLM followed by discharge in cubic metres multiplied by ten.
What to ask for instead of a conversion
Three questions replace the conversion, and all three have answers. Ask the machine's supplier for discharge in cubic metres, and for the range rather than the top of it — that is a property of the machine and nobody else can supply it. Ask your engineer or your specification for cement content in kilograms per cubic metre, because that single number is what turns bags into volume for your job, and it is job-specific by design. Then read the net mass printed on the bag in front of you. With those three you can size a pour in whatever unit your yard actually speaks, and you never need a factor written by somebody who has seen neither your mix nor your bag. If you are buying into the Philippines, where the bagger is the working unit, our page on the 2024 Philippine customs record for this machine class sets out who supplied that market.
Source: synthesis of the sections above; no new figure is introduced here. The Philippine import figures sit on that page with their own customs source.