// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
// select a module to initialize
/ search↵ open firstesc close
// adsenseEMPTY_LEADER_SLOT728×90
// adsenseMOBILE_ANCHOR_SLOT320×50
// keyboard_shortcuts
/focus search
↑↓navigate module list
Enter
open first result from search
open highlighted
compute when module is open
compute when focused in a field
Escclose module · clear selection
⌫
build.lightning-protection Calculator
Calculates the number of lightning rods and their spacing for a building roof using the rolling sphere method per NFPA 780. The rolling sphere method models a 45-metre radius sphere — any point the sphere can touch without hitting a rod is unprotected.
Inputs
Building Height
Vertical measurement. For health calculators, typically standing height without shoes.
Width
Horizontal extent perpendicular to the length.
Length
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Risk Zone
Reference formula or conversion factor shown for context.
Results
rods needed (est.)
Sample size or count used in the calculation.
rod spacing (m)
Sample size or count used in the calculation.
protected area (m^2)
The computed two-dimensional surface area.
roof area (m^2)
The computed two-dimensional surface area.
protection angle method
The recommended calculation method or analytical approach for these conditions.