Plan crane mast height with confidence now. Factor load path, rigging, clearance, and wind sway. Get sections, tie-ins, and printable summaries in minutes online.
Enter geometry and allowances. Use consistent site datum for elevations.
Sample inputs and typical outputs for quick reference.
| Scenario | Pick point | Clearance | Rigging | Safety | Estimated tower | Tie-ins |
|---|---|---|---|---|---|---|
| Mid-rise core | 55 m | 3 m | 4 m | 5% | ~67 m | Likely |
| High-rise podium | 85 m | 4 m | 5 m | 7% | ~104 m | Yes |
| Basement crane base | 45 m | 3 m | 4 m | 5% | ~63 m | Maybe |
This calculator estimates the mast height needed to achieve a target hook height with allowances.
Tower height begins with the highest pick point referenced to a consistent datum. On many sites, the critical pick point is 50–120 m above grade, while crane bases may be 0–15 m above or below that same reference. A mismatch in datum can shift required mast height by several meters and change tie-in needs.
Vertical allowances combine clearance, rigging, and hook block geometry. A common planning stack is 2–5 m clearance above obstructions plus 3–7 m for slings, shackles, spreaders, and lifting accessories. Hook block and reeving geometry often adds 1–2 m. These values should match the lift plan and chosen load-handling method.
Wind-driven sway and operational limits affect how much headroom is needed to hold the load stable. A typical sway allowance of 0.5–2.0 m is used for early planning, then refined using site wind policy and lifting restrictions. A safety percent of 3–10% adds robustness for tolerances, temporary works changes, and staging.
Mast systems are assembled in discrete section lengths, commonly 1.5–3.0 m per section. Once the required tower height is calculated, rounding up to whole sections creates an “actual mast height” that can exceed the minimum by up to one full section. This extra headroom may reduce operational constraints but must still satisfy manufacturer limits.
Free-standing height is model-specific and often ranges from 30–60 m before ties are required. When the mast exceeds the free-standing limit, tie-ins are typically spaced 12–24 m vertically depending on the structure and engineering design. This calculator estimates tie-in counts to support early coordination with the structural frame and access planning. For complex phases, run multiple scenarios for podium, topping-out, and material handling to compare heights and minimize reconfigurations during construction later.
It is the maximum elevation where a lifted load must be placed or cleared, measured from your chosen project datum. Use the highest realistic lift point, not average working elevations.
Yes. If the crane base is below your building datum, enter a negative value. This increases the vertical difference and generally increases required hook and tower height.
Use your lifting plan assumptions. Clearance often falls between 2–5 m, while rigging commonly totals 3–7 m. Confirm with the rigging design, load geometry, and site exclusion zones.
No. It supports early planning only. Final configuration must follow manufacturer mast catalogs, load charts, tie-in requirements, and the engineered lifting and temporary works documentation.
Tower masts are built in standard section lengths, so the required height is rounded up to whole sections. This produces the actual build height you would typically order and erect.
It is an estimate based on free-standing height and vertical spacing. Structural capacity, connection detailing, and wind design govern the final tie-in plan, so verify with the engineer and supplier.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.