What must be determined first to calculate the formula for block load?

To calculate the formula for block load, determining the load weight is essential because it directly influences the total force being acted upon by the block and tackles system. The load weight provides the necessary information to compute various aspects of rigging, such as the tension within the lines and the overall capacity needed for the rigging equipment being utilized.

Understanding the load weight forms the foundation upon which other factors, such as the load's center of gravity or, in some cases, the coefficient of friction, can be assessed. Once the load weight is known, riggers can make informed calculations regarding safety factors and equipment requirements to ensure a secure and effective lifting operation.