Load & Sling Configuration
Enter a valid positive weight
For 3+ slings without a spreader bar, only 2 are typically effective for load distribution.
Sling Angle & Material
Angle must be between 1° and 90°
Measured from horizontal. 90° = vertical.
Safe Zone
Enter a valid positive value
Sling Tension Results
Tension Per Sling
2,887 kg
6,364 lbs
T = W / (n × sin θ)
Load Angle Factor
1.155
Multiplier
LAF = 1 / sin θ
Included Angle
60°
Between slings
Vertical Load / Sling
2,500 kg
5,512 lbs
Load Breakdown
Enter a valid weight (0 or positive)
Enter a valid weight
Enter a valid weight
Safety Factor
Capacity Results
Total Load Weight
4,320 kg
9,524 lbs
Required Crane Capacity
6,480 kg
14,286 lbs
Total × Safety Factor
Load Angle Factor Table
| Angle (Horizontal) | Included Angle | LAF | Tension Increase | Risk |
|---|---|---|---|---|
| 90° | 0° | 1.000 | 0% | Optimal |
| 75° | 30° | 1.035 | +3.5% | Safe |
| 60° | 60° | 1.155 | +15.5% | Safe |
| 45° | 90° | 1.414 | +41.4% | Caution |
| 30° | 120° | 2.000 | +100% | High Risk |
| 15° | 150° | 3.864 | +286% | Danger |
| 5° | 170° | 11.474 | +1,047% | Extreme Danger |
Best Practice: Maintain sling angle ≥ 60° (included ≤ 60°). Angles below 30° dramatically increase tension and risk.
Material Angle Limits
| Material | Min. Recommended Angle | Source |
|---|---|---|
| Wire Rope | 30° | ASME B30.9 |
| Chain | 30° | OSHA 1926.251 |
| Synthetic Web | 45° | ASME B30.9 / Manufacturer |