Concrete mixer capacity is the volume a mixer can process in a single batch, measured in cubic feet or cubic meters. Picking the right capacity affects every batch, every pour, and every payday on the job site.
Too small means stalled crews waiting on material. Too big means wasted concrete, harder cleanup, and a cumbersome machine that fights you in tight spaces.
What is Concrete Mixer Capacity?
Mixer capacity refers to two different numbers, and confusing them is one of the most common buying mistakes contractors make.
Drum capacity is the total volume of the mixing drum. Mixing capacity, also called batch capacity, is the actual volume of usable concrete per batch and runs roughly 60 to 80 percent of drum capacity. A 9 cubic foot mixer typically yields about 6 cubic feet of finished concrete per batch.
Drum Capacity vs. Mixing Capacity
The mixing drum needs headspace for the rotating drum to tumble raw materials properly. Fill it past 80 percent and the cement, sand, aggregate, and water cannot cascade and combine the way they need to. The result is uneven, weak concrete.
Buyers should always check the spec sheet for batch capacity, which is the number that determines what you can actually pour.
How Capacity Is Measured
The U.S. construction industry typically lists mixer capacity in cubic feet for masonry equipment and cubic yards for ready-mix and large pours. The cubic meter is the international standard and shows up on imported machines and global spec sheets.
| Unit | Equivalent |
|---|---|
| 1 cubic yard | 27 cubic feet |
| 1 cubic meter | 35.3 cubic feet |
| 1 cubic yard | 0.76 cubic meter |
| 1 cubic foot | 7.48 gallons |
How to Calculate the Mixer Capacity You Need
Match mixer capacity to your hourly placement rate, not to the size of the whole pour. Calculate how much fresh concrete your crew can place per hour, multiply by your safety buffer, and pick a mixer that produces that volume in two to four batches per hour.
Step 1: Estimate Total Volume
Start with the total volume of concrete the project needs. Convert your dimensions to cubic yards of concrete and add a 10 to 20 percent waste factor for spillage, over-excavation, and forming losses. The number you land on tells you what the job needs, but not what the mixer needs.
Step 2: Set a Realistic Pour Rate
Decide how fast your crew can place material. Crew size, placement method (wheelbarrow, pump, or skid steer), set time, and weather conditions all stretch or shrink the window. Concrete that sits too long before placement loses workability and can fail spec, so build that constraint into the construction process from the start.
Step 3: Match Batch Size to Throughput
A typical hydraulic mixer cycles in three to five minutes from load to dump. Run that math against your hourly target and the mixer size becomes obvious.
| Mixer Capacity | Batch Yield | Batches/Hour | Hourly Output |
|---|---|---|---|
| 9 cu. ft. | ~6 cu. ft. | 8 to 10 | 48 to 60 cu. ft. (1.8 to 2.2 cu. yd.) |
| 12 cu. ft. | ~8 cu. ft. | 8 to 10 | 64 to 80 cu. ft. (2.4 to 3.0 cu. yd.) |
| 20 cu. ft. | ~14 cu. ft. | 6 to 8 | 84 to 112 cu. ft. (3.1 to 4.1 cu. yd.) |
*Rates assume a trained operator and standard mortar, grout, or concrete mixtures. Local materials and ambient conditions will shift the numbers.
Concrete Mixer Capacity Ranges by Project Type
- Small projects under 2 cubic yards run well on 6 to 9 cubic foot mixers.
- Mid-size masonry, fencing, and hardscape jobs typically call for 9 to 12 cubic foot hydraulic mixers.
- High-volume commercial walls, refractory linings, and precast operations need 12 to 36 cubic foot capacity to keep crews fed.
Small Jobs and Repair Work (Under 2 Cubic Yards)
Post setting, patching, footing repairs, and small slabs are typical on this scale of construction project. Portability and quick cleanup matter more than raw output here. A cement mixer that is too large for a small repair job wastes material every time you mix a partial batch.
Mid-Volume Masonry, Fencing, and Hardscape (2 to 6 Cubic Yards)
Block walls, paver bases, fence post lines, and retaining walls fall in this range. The EZG MH9 and MH12 hydraulic mixers cover most of this work, and for crews chasing the work across a site, the Mobile Mud Hog skid steer mixer puts the mixer where the masons are.
High-Volume Commercial and Industrial Pours (6+ Cubic Yards)
Multi-story masonry, large foundations, and refractory installations need 20 cubic foot or larger units to keep up. The EZG MH20 handles high-volume masonry production, and the Refractory Mud Hog line, RMH9 through RMHE36, covers refractory and precast applications up to 36 cubic feet per batch.
Hydraulic Mixers and Why Capacity Performance Differs
Hydraulic systems deliver consistent torque to the mixing drum at any rotation speed. That means a hydraulic mixer maintains its rated capacity under full load, even with stiff, low-slump material. Gear-driven and belt-driven units lose efficiency when the drum gets heavy, so their published capacity rarely matches real-world output on tough mixes.
How Hydraulic Drive Affects Real Capacity
Constant torque means consistent batch quality from the first pour of the day to the last. Hydraulic drive eliminates belt slip, reduces breakdowns, and extends service life. Mixing concrete with low slump or stiff refractory mix is exactly where hydraulic drive earns its price.
Drum Construction and Real-World Durability
EZG builds the Mud Hog mixer drum with 3/8″ steel. When the engineering team asked Damian Lang how thick to make the drum, his answer was simple: thick enough that a sledgehammer cannot put a dent in it. That construction is why EZG mixers hold their rated capacity over years of daily use instead of slowly losing performance to wear and impact damage.
Browse the full Mud Hog Hydraulic Mixers lineup to compare drum specs.
EZG Manufacturing’s Hydraulic Mixer Capacities
EZG Manufacturing builds hydraulic mixers in three core capacities for masonry, fencing, and hardscape work, plus extended sizes up to 36 cubic feet for refractory and precast applications. Each model offers gas, diesel, or electric configurations to match power availability on the job.
Mud Hog Hydraulic Mixer Lineup
| Model | Capacity | Power Options | Common Applications |
|---|---|---|---|
| MH9 | 9 cu. ft. | Gas, Electric (1Ph/3Ph) | Small to mid-size masonry, fencing, repair |
| MH12 | 12 cu. ft. | Gas, Diesel, Electric | Mid-size commercial masonry, hardscape |
| MH20 | 20 cu. ft. | Gas, Diesel, Electric (3 voltages) | High-volume commercial, large pours |
Refractory Mud Hog Capacities
The Refractory Mud Hog line covers 9 to 36 cubic foot capacities and ships with replaceable drum liners built for the abrasive nature of refractory work. RMH9, RMH12, RMH12D, RMHE20, RMHE29, and RMHE36 give refractory contractors a true range without forcing them to oversize.
Mobile Skid Steer Mixers
The Mobile Mud Hog ranges from 4 to 20 cubic feet and mounts to a skid steer so crews can move the mixer with the work. Fencing contractors, hardscape installers, and any operation working long linear pours benefit from putting the mixer next to the placement point.
Other Factors That Affect Capacity Selection
Mixer capacity is the headline number, but five other factors decide whether the machine performs at its rating: power source, mobility, delivery system pairing, maintenance access, and total cost of ownership. Skip any of them and the wrong mixer slows the entire construction process.
Power Source: Gas, Diesel, or Electric
Each power source affects how a mixer performs at full load:
- Gas: portable, common on towable units, and refuels anywhere. Best for general masonry and remote sites.
- Diesel: more torque per gallon, better for continuous duty cycles. Common on large refractory and high-volume masonry mixers.
- Electric: cleaner, quieter, and well suited to indoor or noise-sensitive sites. Needs reliable three-phase power for larger units.
A powerful engine matched to the right drum size keeps the rated capacity honest under heavy mixes.
Job Site Mobility and Footprint
Various types of mounting and transport options exist:
- Towable trailer units for road transport between sites
- Skid steer mounted units for changing positions on linear work
- Stationary plants for permanent yards and precast facilities
Choose the configuration that matches how the crew actually moves through the workday.
Pairing the Mixer with the Delivery System
Match mixer output to your concrete delivery method, whether that is gravity-fed delivery or a pump. EZG builds matching delivery hardware in the Hog Pumps and Grout Hog gravity-fed delivery systems lineup so contractors can size the mixer and the delivery together.
Regular Maintenance and Spare Parts Access
Regular maintenance on paddles, liners, hydraulic fluid, and bearings keeps the mixer at its rated capacity instead of slowly losing output to wear. Easy access to spare parts is its own buying criterion.
Total Cost of Ownership
Damian Lang puts it plainly: 30 percent of a mixer’s cost is the purchase, and 70 percent is the use. Build quality, parts availability, mechanic time, and warranty all decide the real number. EZG backs every machine with a 100 percent satisfaction guarantee and a published warranty, which is part of why most EZG customers come back for their second, third, and fifteenth piece of equipment.
Choosing the Right Mixer With EZG Manufacturing
EZG Manufacturing builds hydraulic mixers from contractor-tested designs, with 3/8″ steel drums and a hydraulic drive built for full-load performance. Sizing the right capacity starts with the work in front of you, and EZG’s team helps contractors pick machines based on actual throughput, not catalog numbers.
Browse the full Mud Hog hydraulic mixer lineup, explore the broader mixers category, or contact EZG to walk through your specific needs with someone who has actually been on a job site.
Financing is available, and our customer-driven engineering keep our mixers ahead of contractor expectations year after year.
