Mini Excavator Sizes: What Size Mini Excavator Do You Need?
News | September 19, 2026 | Updated October 14, 2026
Quick Answer
Comparing mini excavator sizes starts with the job’s hardest requirements: the available access, excavation depth, working reach and any essential attachments or lifting duties. A tonnage label is a useful category, but it does not establish all those capabilities.
Shortlist machines against measured requirements, then compare transport and cost. The smallest machine that passes every essential check may be suitable; the smallest machine that merely fits through the entrance may not finish the work.
Three Catalog Sizes Compared
Qisheng’s October 2026 catalog gives the following dimensions for these series. The table uses actual catalog values rather than assigning generic capabilities to tonnage classes.
| Catalog series | Overall width | Overall height | Maximum digging depth |
|---|---|---|---|
| QS-12 | 940 mm | 2,150 mm | 1,760 mm |
| QS-18 | 1,160 mm | 2,200 mm | 2,100 mm |
| QS-25 | 1,300 mm | 2,400 mm | 2,600 mm |
The Basic and PRO variants share the listed dimensions within these series. Their engine choices differ. A different engine specification should not be assumed to change the physical access envelope or digging depth.
These figures are an initial screen. Confirm dimensions for the ordered equipment, and obtain the working-range diagram. The catalog does not state configured operating weights or lift charts for this comparison, so neither is inferred from the series names.
A Job Where None of the Three Fits Every Requirement
Suppose a project has a 1,100 mm usable access opening and requires a 2,000 mm excavation. These are illustrative job requirements.
The QS-12’s listed 940 mm width is below the opening width, but its 1,760 mm maximum depth is insufficient. The QS-18 reaches beyond 2,000 mm on the catalog’s maximum-depth measure, but its listed width is greater than the opening. The QS-25 is wider again.
None of these standard catalog configurations therefore passes both initial checks. Choosing the QS-12 just because it can enter would leave the excavation requirement unresolved. Choosing the QS-18 just because it can dig deep enough would leave access unresolved.
A verified alternative configuration, a different model or a revised access and work arrangement is needed. Optional retractable tracks are not proof of a fit until their actual dimensions and operating requirements have been supplied.
Check the Remaining Job Requirements
| Requirement | Evidence needed before choosing |
|---|---|
| Access through the whole route | Measured widths, overhead clearance, bends and the delivered machine dimensions |
| Excavation at the intended position | Depth requirement and the matching working-range drawing |
| Material loading or placement | Required dump position or applicable machine-specific lift chart |
| Powered attachment work | Confirmed mounting, weight, hydraulic flow, pressure and any return-line requirements |
| Delivery and moving between jobs | Configured transport weight, dimensions and suitable transport arrangements |
The available working area can matter as much as the entrance. Allow for positioning, movement of the upper structure and spoil placement, rather than checking a straight-line width alone. Bobcat’s specification guide treats digging depth, reach and tail swing as distinct considerations.
Compare Cost After the Capability Check
Once two machines meet the essential requirements, compare the equipment supplied and the total cost to use them. A lower machine price may be outweighed by separate transport, missing attachments or having to hire another excavator for part of the work.
For recurring projects, record how often each difficult requirement occurs. If nearly every job needs deeper excavation, repeatedly hiring a larger machine may change the purchase decision. If the deep job is exceptional, a separate rental may be reasonable. Use the buy-versus-rent calculation with your own expected work.
Frequently Asked Questions
What size mini excavator do I need for landscaping?
Define the actual tasks first. Planting beds, drainage trenches, retaining-wall excavations and material placement can require different capabilities. Use their required dimensions and loads rather than the general job name.
Is a larger mini excavator always faster?
No universal result follows from size alone. Access, material, attachments, working room and the amount of spoil handling all affect the job. A larger machine that cannot be positioned properly may not solve the problem.
Sources and Selection
Qisheng catalog, October 9, 2026: QS-12, QS-18 and QS-25 specification sheets. The access-and-depth scenario uses stated assumptions.
Send Qisheng your access measurements, deepest excavation and essential attachments to request a shortlist with the relevant drawings and a complete quotation.