Working Load Limit Calculator
To use safe working load limit calculator, enter breaking strength in pounds of (sling, chain, or rope) and select appropriate safety factor from dropdown menu e.g., 5 for a 5:1 ratio.
Calculator shows maximum safe working load along with calculation details and safety notes.
The breaking strength of material is 10,000 lbs, and safety factor applied is 5. To calculate working load limit (WLL), formula used is WLL = 10,000 / 5, which results in a WLL of 2,000 lbs. The final result indicates that the WLL is 2,000 lbs.
Working Load Limit Calculator
| Breaking Strength (lbs) | Safety Factor | Working Load Limit (WLL) (lbs) |
|---|---|---|
| 10,000 | 5 | 2,000 |
| 8,000 | 4 | 2,000 |
| 15,000 | 3 | 5,000 |
| 20,000 | 5 | 4,000 |
| 12,000 | 4 | 3,000 |
| 25,000 | 5 | 5,000 |
| 30,000 | 4 | 7,500 |
| 18,000 | 3 | 6,000 |
| 40,000 | 5 | 8,000 |
| 50,000 | 4 | 12,500 |
Working Load Limit Formula
WLL = Breaking Strength ÷ Safety FactorParameters:
- Breaking Strength: Maximum load before failure (lbs)
- Safety Factor: Design factor (4:1 to 10:1)
- WLL: Safe working load limit (lbs)
For breaking strength of 10,000 lbs with 5:1 safety factor: WLL = 10,000 ÷ 5 = 2,000 lbs safe working load.
How to Calculate Working Load Limit?
To calculate WLL, divide the breaking strength by the appropriate safety factor. If equipment has a breaking strength of 15,000 lbs and requires a 4:1 safety factor, the WLL would be 15,000 ÷ 4 = 3,750 lbs.
For 20,000 lbs breaking strength at 5:1: WLL = 4,000 lbs.
With a 12,000 lbs at 4:1: WLL = 3,000 lbs.
For 30,000 lbs at 8:1: WLL = 3,750 lbs.
What is Working Load Limit?
Working Load Limit (WLL): The WLL is the maximum load that lifting equipment can safely handle under normal operating conditions. It’s calculated by dividing the equipment’s breaking strength by a safety factor to ensure a significant margin of safety during operations.
Safety Factors: Different safety factors are used based on the application’s risk level. For example, general lifting might use a 4:1 factor, while personnel lifting requires at least 8:1 to provide additional safety margin. The safety factor helps account for variables like wear, dynamic loads, and environmental conditions.