Ask three dealers for a concrete mixer and you’ll get three different languages back. One says 10/7. One says one bag. One says 200 litres. A fourth throws in “200T” and now you’re properly lost.
Here’s the funny part: those four answers can all describe the same machine.
At MKG, we build and supply concrete mixing equipment across India, and this is easily the most common question that reaches our sales desk. Not “which is the strongest drum” – it’s “how much can it actually give me in a day?” Fair question, because that’s the number your site runs on.
So let’s decode the labels, do the arithmetic together, and land on a mixer size that matches your pour instead of your budget guess.
The Two Numbers on the Drum: What 10/7 Really Means
Start with the one everybody quotes. A 10/7 mixer means you load 10 cubic feet of loose material – cement, sand, aggregate and after mixing you get out roughly 7 cubic feet of finished concrete. In litres, that’s about 300 in, 200 out.
Why does volume shrink? Because dry sand and aggregate are full of air gaps. Once water and cement paste fill those gaps and the drum tumbles everything together, the mix packs down. Nothing is lost. It just becomes denser.
This trips up more buyers than anything else. If you size your machine off the first number, you’ll over-promise your own pour by about 30% before the first batch ever leaves the drum. Always plan on the second number.
The same logic runs through the whole range you’ll see quoted in the market:
Common label | Drum in / out | Roughly, mixed output |
|---|---|---|
Half bag | 5 / 3.5 cft | ~0.10 cu.m per batch |
Three-quarter bag | 7 / 5 cft | ~0.14 cu.m per batch |
One bag | 10 / 7 cft | ~0.20 cu.m per batch |
Two bag | 14 / 10 cft | ~0.28 cu.m per batch |
Why We Talk in "Bags" at All
The bag language comes straight from the cement godown. A “one-bag mixer” is sized so that one 50 kg cement bag goes in per batch, along with its matching sand and aggregate.
That’s not marketing shorthand. It’s a genuinely useful habit, because it keeps your mix design honest.
Think about what happens the other way round. If your mixer takes one and a quarter bags, someone on site is splitting a bag by eye every single batch. Do that 60 times a day and your cement content wanders all over the place – some batches rich, some starved, and a slab whose strength you can’t really vouch for.
Whole bags per batch means repeatable proportions with no guesswork from your helper. That’s the quiet reason the one-bag 10/7 has become the default machine on Indian sites.
And What About "200T"? The IS 1791 Naming System
If you’ve read a technical spec sheet or a tender document, you’ll have seen designations like 200T, 280NT or 400R. This comes from IS 1791, the Bureau of Indian Standards specification for batch-type concrete mixers.
It’s simpler than it looks:
- The number is the nominal mixed batch capacity in litres.
- The letter tells you the drum type. T for tilting, NT for non-tilting, R for reversing.
So 200T is a 200-litre tilting drum mixer – which is exactly your 10/7, one-bag machine wearing formal clothes. You can read more about the standards framework on the Bureau of Indian Standards site, and there’s a decent plain-English background on concrete mixers here.
Worth knowing when a tender asks for a specific designation and you need to confirm your machine qualifies.
Now the Number That Actually Matters: Your Daily Pour
Here’s where most buying decisions go wrong. People compare drum sizes. They should be comparing output per day against how much concrete they need to place per day.
Let’s work it out properly, because the maths takes thirty seconds.
Every batch runs through a cycle: load the drum, mix, discharge, come back to start. Loading takes a minute or two depending on whether you’re shovelling by hand or using a hopper. Mixing takes two to three minutes. Discharge and reset takes another minute or so.
Call it a five-minute cycle on a well-run site. That’s 12 batches an hour on paper.
Now be realistic. Nobody hits 12. Materials run out, a helper steps away, the drum needs a rinse. Plan for 8 to 10 batches an hour, and your one-bag mixer gives you:
10 batches × 0.20 cu.m = about 2 cubic metres per hour.
Over an eight-hour working day, allowing for breaks and setup, that’s roughly 12 to 14 cubic metres.
Suddenly the decision is easy. Pouring a 100 sq.m slab at 125 mm thickness? That’s 12.5 cubic metres. A single one-bag mixer will finish it in a day, but it’ll be a full day with no slack. Two mixers, or a step up in size, and you’re done by mid-afternoon with room to breathe.
A Straight Sizing Table
Match your daily requirement to the machine, not the other way around:
Your daily pour | What suits it | Typical work |
Under 5 cu.m | Half-bag or three-quarter bag | Repairs, plinth beams, small footings, boundary walls |
5 – 15 cu.m | One-bag 10/7 mixer | Individual houses, small slabs, plot construction |
15 – 25 cu.m | Two-bag mixer, or two one-bag units | Apartment floors, small commercial buildings |
25 – 90 cu.m | Reversible drum mixer | Multi-storey projects, roads, precast yards |
Above 90 cu.m | Batching plant or ready-mix | Large infrastructure |
Sitting right on a boundary? Size up. A mixer running at 70% of its ability lasts far longer than one flogged at 110% every single day.
The Bottleneck Is Often Not the Mixer
Here’s something the spec sheets never mention. You can buy a machine that mixes 3 cubic metres an hour and still only place 1.5.
Because concrete has to travel. It goes from the drum into pans or a trolley, up the building, across the deck, into the shutter, and then it has to be compacted before it stiffens. Every one of those steps has its own speed limit.
Ask yourself honestly:
- How is it going up? A tower hoist or mini lift has a cycle time too. On taller structures, a Vimaan passenger and material hoist changes the equation completely.
- How many hands are placing it? A big mixer with a small crew just produces concrete that sits and stiffens.
- Can you compact it fast enough? Placement speed is capped by your concrete vibrator capacity, and getting the spacing right matters more than most people think – our guide on concrete vibrator insertion spacing covers that in detail.
Buy a mixer that’s slightly ahead of your slowest step, not miles ahead of it. The extra capacity you paid for just idles.
Why Bigger Isn't Automatically Better
Tempting logic: get the largest drum you can afford and you’ll never be short. It backfires in three ways.
Overloading ruins the mix. A drum needs empty space above the material for the blades to lift and drop it. That tumbling action is what coats every aggregate particle in cement paste. Fill the drum right up and the material just slides around in a lump. You get an uneven mix and a slab that doesn’t test the way you expected.
It punishes the machine. A drum carrying more than its rated load strains the motor, wears the bearings, chews through belts and shortens gearbox life. You save nothing.
Fresh concrete doesn’t wait. Mix more than your crew can place inside the working time and the surplus stiffens where it stands. That’s cement, sand and aggregate straight to the debris pile.
The mixer’s rated capacity isn’t a suggestion. It’s the point where mixing quality and machine life are both at their best.
Hopper or No Hopper, Electric or Diesel
Two more choices that quietly change your real-world output.
The hopper question is really a labour question. Without one, your team shovels material up into the drum, and that’s slow, tiring work that gets slower after lunch. A hydraulic hopper drops to ground level, gets loaded, and lifts the whole charge in one go. Your cycle time shortens, and it stays consistent through the day. Our concrete mixer is available in both configurations for exactly this reason.
The power question is about where you’re working. A 5 HP three-phase electric motor is quieter, cheaper to run and ideal on urban plots with a proper connection. A 6 HP air-cooled diesel engine doesn’t care whether the grid exists, which makes it the sensible pick for rural sites, road work and anywhere the supply is unreliable. Same drum, same output – just decide before you order, because retrofitting later is a nuisance.
When You've Outgrown the Tilting Drum
There’s a clear point where adding more one-bag mixers stops making sense. More machines mean more operators, more fuel points, more maintenance, and batch-to-batch consistency that drifts between units.
Once you’re consistently above 20–25 cubic metres a day, a reversible drum mixer is the right move. The drum spins one way to mix and the other way to discharge, so there’s no tilting and no waiting.
Our RCM 800E and 800D deliver 9 to 12 cu.m per hour from an 800-litre hopper and 600-litre batch, running on a 10 HP electric motor or a 16 HP air-cooled diesel engine. The RCM 1050E steps that up to 12 to 15 cu.m per hour with a 750-litre batch and a 15 HP motor.
More importantly, this is where batching stops being a shovel-count. Load-cell digital weighing, automatic water and admixture dosing, batch printing over USB, and SCADA compatibility mean every batch is proportioned by instrument rather than by eye. On projects where cube results get audited, that record is worth as much as the output.
Not Ready to Buy? Consider the Other Routes
Capacity needs move around during a project. The mixer that suited your foundation phase may sit idle during finishing, and then feel undersized when the slabs come.
- Rental makes sense for a short high-volume phase or a one-off pour.
- Recon machines are factory-refurbished units – a genuinely sensible way to add a second mixer without a new-machine budget.
- Buy back helps when you’re stepping up and want to release value from what you already own.
And whichever route you take, keep genuine spare parts within reach. A mixer sitting idle for a belt has an output of zero, regardless of what the label on the drum says.
Getting the Sizing Right the First Time
Pick your mixer with three numbers in hand: the concrete you need per day, the mixed output of the machine, and how quickly your crew can actually place it. Get those three lined up and everything downstream – your power trowel finishing window, your compaction, your pour schedule – falls into place behind it.
Get it wrong and you’ll either be standing around waiting for concrete, or throwing away concrete nobody could place in time. Both cost money, and one of them costs strength too.
Not sure which size fits your project?
Tell us your slab area, thickness and how many days you’ve got. Our team will work the numbers with you and recommend a machine that matches – no oversell.
Email info@rajat-group.com or call +91 95222 39320. You can also find your nearest MKG dealer.
Frequently Asked Questions
1. What does 10/7 mean on a concrete mixer?
It means the drum takes 10 cubic feet of loose dry material and produces about 7 cubic feet of mixed concrete – roughly 300 litres in, 200 litres out. The volume drops because water and cement paste fill the air gaps between sand and aggregate particles. Always plan your pour on the second figure.
2. Is a one-bag mixer the same as a 10/7 mixer?
Yes. “One bag” refers to a single 50 kg cement bag going into each batch, and that batch size works out to a 10/7 drum. Under IS 1791 the same machine is designated 200T, meaning a 200-litre tilting drum. Different names, same machine.
3. How much concrete can a one-bag mixer produce in a day?
At a realistic 8 to 10 batches an hour, expect around 2 cubic metres per hour, or roughly 12 to 14 cubic metres over a full working day. The exact figure depends on how you load the drum, how many people are placing the concrete, and how far it has to travel on site.
4. Can I overload the drum to get more output per batch?
No, and it costs you twice. Overloading leaves no headspace for the blades to lift and drop material, so the mix comes out uneven and weaker than designed. It also strains the motor, bearings and gearbox, cutting machine life short. Run two batches instead of one oversized one.
5. When should I move from a tilting mixer to a reversible drum mixer?
Once you’re consistently pouring more than 20 to 25 cubic metres a day, or whenever batch accuracy needs to be documented. A reversible mixer handles 9 to 15 cubic metres an hour and supports load-cell weighing and automatic dosing, which manual tilting mixers can’t offer.
