Rigging Load Calculator

Safe working load for aerial performance rigging points.

Dead load (kg)

Live load (kg)

Dynamic factor

Safety factor

Bridle angle (°)

Number of legs

Tab to move between fields

Design load (kg)

260

Load per leg (kg)

260

Static load (kg)130

Static load (lbs)286.6

Required MBS (kg)2,080

Required MBS (lbs)4,586

Per-leg MBS (kg)2,080

Wire rope dia (mm)3

Min Breaking Strength N20,404.8

How to Use This Calculator

Enter the dead load (kg) — weight of all fixtures and hardware on the rigging point.
Input the live load (kg) — performer body weight for aerial acts (0 for scenery only).
Set the dynamic factor (1 = static, 2 = moderate aerial, 5+ for drop catches).
Enter the safety factor — minimum 5:1 for scenery, 8:1 to 10:1 for life-safety aerial.
Review Design Load (kg), Required WLL (Working Load Limit), and safety rating for your hardware.

How the result changes with Dynamic factor

Dead load (kg): Weight of fixtures, hardware, and non-moving equipment on the point.
Live load (kg): Performer body weight for aerial acts (set to 0 for scenery-only rigging).
Dynamic factor: Multiplier for shock loads (1 = static only, 2 = moderate aerial, 5+ = drop catches).
Safety factor: Design safety factor — 5:1 for scenery, 8:1 to 10:1 for life-safety aerial.
Bridle angle (°): Included angle between bridle legs (0 = single vertical point, 90 = moderate splay).
Number of legs: Number of rigging legs sharing the load.

Static load (kg): Total weight without dynamic multiplier.
Static load (lbs): Total weight in pounds.
Design load (kg): Load including dynamic factor — the force the rigging must handle.
Load per leg (kg): Tension on each rigging leg after bridle angle adjustment.
Required MBS (kg): Minimum breaking strength of the rigging hardware.
Required MBS (lbs): Minimum breaking strength in pounds.
Per-leg MBS (kg): Each leg must have at least this breaking strength.
Wire rope dia (mm): Suggested minimum 6×19 IWRC wire rope diameter for each leg.

Identify Input Parameters
4 parameters
Dead load (kg) = 50, Live load (kg) = 80, Dynamic factor = 2, Safety factor = 8 = 6 input(s) provided
Calculate Design load
Design load = totalMassKg * dynamicFactor
260 = 260
Calculate Load per leg
Load per leg = designLoadKg / (numLegs * cosHalf)
260 = 260
Calculate Static load
Static load = deadLoadKg + liveLoadKg
130 = 130
Calculate Static load
Static load = totalMassKg * 2.20462
286.6 = 286.6