Forklifts, Lift Equipment & Material Handling Vehicles worked example

Mast Load Margin with available rated or residual capacity of 2,500 lb: a worked example

This worked example runs the mast load margin numbers for a tougher week than the baseline: available rated or residual capacity of 2,500 lb instead of the typical 5,000 lb. Compare available mast or residual lift capacity against the required load to understand capacity margin.

The inputs for this scenario

  • Available rated or residual capacity: 2,500 lb (the input this scenario stresses; the baseline uses 5,000)
  • Required load weight: 4,200 lb (held at the documented default)
  • Capacity reference basis: 5,000 lb (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Mast Load Margin gap = available rated or residual capacity - required load weight.
  • Mast Load Margin margin works out to -34 % at these inputs, and this is the headline figure for the scenario.
  • Mast Load Margin gap works out to -1,700 value at these inputs.
  • Available rated or residual capacity works out to 2,500 value at these inputs.
  • Required load weight works out to 4,200 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where available rated or residual capacity sits at 5,000 lb and the headline result is 16 %, this scenario comes in 313% below the baseline at -34 %.
  • Use it when assigning a truck to a load, validating a lift after derating for height or attachments, or auditing whether a fleet has adequate safety headroom. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Mast Load Margin margin: -34 % (headline result)
  • Mast Load Margin gap: -1,700 value
  • Available rated or residual capacity: 2,500 value
  • Required load weight: 4,200 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Mast Load Margin calculator, set available rated or residual capacity to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.