The capacity classes the crane estimator sizes into, each anchored to a named make and model load chart (Grove, Link-Belt, National Crane) with capacity at radius.
This is the exact table the Crane Cost Estimator runs on. Cite it as: Antero Trail, "Mobile crane capacity classes and load chart anchors", anterotrail.com/tools/reference/crane-capacity-classes. Primary sources are listed with each value and at the bottom of the page.
Cited sizing table of representative mobile cranes spanning boom-truck through 100 t+ all-terrain classes, for construction estimating. Every capacity_at_radius value and every max_capacity_tons value was transcribed by eye from the manufacturer load-chart PDF named in that row's citation (the PDFs render as images; charts were read from the rendered pages, not OCR text). Each row's capacity_at_radius comes from ONE stated main-boom length and ONE counterweight/outrigger configuration (named in the citation) on fully extended outriggers, 360-degree rotation unless noted; it is NOT a per-radius best-case across boom lengths, and this is a sizing aid, not a lift plan. Numbers were never inferred or interpolated: where a value was not printed in the source (notably max_tip_height_ft for the NBT30H-2, RTC-8050 II, RT890E, and GMK4100L-1) the field is null with a _note. requires_oiler is false on every row: none of these are lattice cranes and no manufacturer document reviewed states an oiler/second-operator requirement; whether an oiler is needed is set by jurisdiction/operational policy, not the spec sheet. Class labels reflect each model's actual manufacturer rating (e.g. the requested ~26 t boom-truck slot is filled by a 30 t NBT30H-2, and the ~55 t RT slot by a 50 t Link-Belt RTC-8050 II, with the 65 t RT765E-2 bracketing above). Unit note: max_capacity_tons is in US (short) tons; the GMK4100L-1 is nominally 100 metric tonnes = 115 US tons per its own product guide. EXTENSION 2026-07-11 (PRP-CALC-1 S8): 90 and 100 ft radius points appended per row, transcribed from the SAME source PDFs (charts additionally verified against rendered page images). Where the row's original boom-length column ends before that radius, the longest main-boom column printing a value there was used and its boom_length_ft is recorded on the point - those points are a different boom configuration from the row's 20-80 ft points (same counterweight/outriggers/360 deg). Exception at_115t@100ft: the strongest PRINTED column (117.1 ft) was used, not the longest. RT530E has no main-boom value past 85 ft radius in its document, so rt_30t keeps its original envelope.
| class ID | class label | make | model | max capacity tons | max capacity note | capacity at radius | max tip height FT | max tip height note | requires oiler | requires oiler note | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|
| boom_truck_30t | Boom Truck 30 ton | National Crane (Manitowoc) | NBT30H-2 | 30 | 60,000 lb at 6 ft radius on 32 ft boom, on outriggers fully extended. Chart footnote: this minimum-radius capacity requires optional 9/16 in. 6x25 IWRC cable. | [object Object], [object Object], [object Object], [object Object], [object Object], [object Object] | not published | No tabulated tip-height figure on the pages transcribed. Main boom is 32 ft - 110 ft (four-section); optional 25 ft and 44 ft tele extensions. The geometric range diagram (page 7) shows the 44 ft extension reaching roughly 160 ft height, but no exact tip-height value is printed, so left null rather than read off the diagram. | no | No manufacturer-stated oiler requirement; single-operator telescopic boom truck. 'false' is an operational/jurisdictional default, not a cited spec. | |
| rt_30t | Rough Terrain 30 ton | Grove (Manitowoc) | RT530E | 30 | 60,000 lb at 10 ft radius on 29 ft boom, on outriggers fully extended, 360 deg. (RT530E-2 is the current Tier-4 revision of this same machine.) | [object Object], [object Object], [object Object], [object Object] | 102.5 | Main boom maximum tip height, stated in the Superstructure Specifications 'Boom' section: 'Maximum tip height: 102.5 ft (31.2 m)'. Optional tele-swingaway raises this to 146 ft. | no | No manufacturer-stated oiler requirement; single-operator RT crane. Operational/jurisdictional default. | |
| rt_50t | Rough Terrain 50 ton | Link-Belt | RTC-8050 Series II | 50 | 100,000 lb at 10 ft radius on 35.5 ft boom, on fully extended outriggers, 360 deg. Used here to represent the ~55-ton rough-terrain class (nearest citable model found; Grove RT765E-2 below brackets it on the heavy side at 65 t). | [object Object], [object Object], [object Object], [object Object], [object Object], [object Object] | not published | No tabulated tip-height figure on the pages transcribed. Main boom is 35.5 ft - 110 ft; optional 33 ft-56 ft bi-fold fly. Rental-listing summaries cite ~168 ft max tip height with extensions, but that figure is not printed on the primary Link-Belt technical-data pages read, so left null. | no | No manufacturer-stated oiler requirement; single-operator RT crane. Operational/jurisdictional default. | |
| rt_65t | Rough Terrain 65 ton | Grove (Manitowoc) | RT765E-2 | 65 | 130,000 lb at 10 ft radius on 36 ft boom, on outriggers fully extended, 360 deg. Manufacturer rates it 60 t / 65 USt. | [object Object], [object Object], [object Object], [object Object], [object Object], [object Object] | 119 | Main boom maximum tip height, stated in product-guide feature text: 'maximum tip height of 36,4 m (119 ft)'. Bi-fold swingaway raises this to 174.5 ft, and with inserts to 214 ft. | no | No manufacturer-stated oiler requirement; single-operator RT crane. Operational/jurisdictional default. | |
| rt_90t | Rough Terrain 90 ton | Grove (Manitowoc) | RT890E | 90 | 180,000 lb at 10 ft radius on 37.3 ft boom, Mode B, on outriggers (24 ft spread), 360 deg. Manufacturer rates it 80 t / 90 USt. | [object Object], [object Object], [object Object], [object Object], [object Object], [object Object] | not published | No tabulated tip-height figure on the pages transcribed. Main boom is 38 ft - 142 ft (five-section, MEGAFORM); optional 33 ft-56 ft offsettable bi-fold swingaway plus 16 ft/32 ft inserts. Left null rather than infer from the 142 ft boom length. | no | No manufacturer-stated oiler requirement; single-operator RT crane. Operational/jurisdictional default. | |
| at_115t | All Terrain 115 ton (100 t class) | Grove (Manitowoc) | GMK4100L-1 | 115 | Nominal rating '100 t (115 USt)' (cover). Chart max = 230,000 lb (=115 US ton) at 8 ft radius on 37.2 ft boom, but that value is flagged 'over rear with special equipment'; the 360-deg max at 9 ft is 177,000 lb. Metric nominal is 100 tonnes. | [object Object], [object Object], [object Object], [object Object], [object Object], [object Object] | not published | No tabulated tip-height figure on the pages transcribed. Main boom is 11.3 m - 60.0 m (37 ft - 197 ft), seven-section; 36 ft-58 ft swingaway extends the system to ~292 ft (cranepedia). Working-range diagram (page 12) tops out just above 200 ft with the 196.9 ft boom near vertical, but no exact tip-height value is printed, so left null. | no | No manufacturer-stated oiler requirement; single-operator telescopic all-terrain crane. Operational/jurisdictional default. (Task suggested 'true' for large AT/lattice cranes only where a cited basis exists; none found for this model, so left false.) |
These calculators produce planning estimates from published public rate schedules. They are not a formal quote. Confirm equipment, access, and pricing with a licensed operator or rental yard before you rely on any number for an estimate.