Enter the scope ratio and the water depth into the calculator to determine the required mooring weight. This calculator helps to estimate the weight needed to securely moor a vessel.

Mooring Weight Formula

The following formula is used to calculate the mooring weight.

W = S * D * K

Variables:

  • W is the mooring weight (pounds)
  • S is the scope ratio (unitless)
  • D is the water depth (feet)
  • K is a constant multiplier, typically 1.5 for standard conditions

To calculate the mooring weight, multiply the scope ratio by the water depth and a constant multiplier. The multiplier may vary based on specific conditions and local regulations.

What is Mooring Weight?

Mooring weight is the weight required to keep a vessel stationary when moored. It is a critical component of the mooring system, which includes the anchor, chain, rope, and the weight itself. The weight ensures that the vessel remains secure in various conditions, preventing it from drifting due to currents, wind, or waves.

How to Calculate Mooring Weight?

The following steps outline how to calculate the Mooring Weight.


  1. First, determine the scope ratio (S).
  2. Next, determine the water depth (D) in feet where the vessel will be moored.
  3. Use the formula W = S * D * K, where K is the constant multiplier.
  4. Finally, calculate the Mooring Weight (W) in pounds.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem :

Use the following variables as an example problem to test your knowledge.

Scope ratio (S) = 7

Water depth (D) = 30 feet

Constant multiplier (K) = 1.5

Mooring Weight (W) = ?

Using the formula: W = 7 * 30 * 1.5 = 315 pounds