Enter the constant coefficient and the two measurement values into the calculator to determine the Rok value; this calculator can also evaluate any of the variables given the others are known.

Rok Formula

The following formula is used to calculate the Rok value.

Rok = A*B/C


  • Rok is the calculated Rok value
  • A is a constant coefficient
  • B is a measurement value
  • C is another measurement value

To calculate the Rok value, multiply the constant coefficient (A) by the measurement value (B), and then divide the result by another measurement value (C).

What is a Rok?

A Rok is a traditional Korean kite that is typically rectangular in shape and made from lightweight materials such as paper or silk, with a bamboo frame. The design of the Rok is unique, featuring a bridle and a single line that allows the kite to be easily controlled and maneuvered in the air. These kites are often brightly colored and may feature intricate designs or images. The Rok is not only used for recreational purposes, but also has cultural significance in Korea, being used in various festivals and celebrations. The most famous of these is the New Year kite-flying event where people fly kites with messages of good luck and prosperity for the coming year.

How to Calculate Rok?

The following steps outline how to calculate the Rok:

  1. First, determine the initial investment ($).
  2. Next, determine the annual cash inflows ($).
  3. Next, determine the annual cash outflows ($).
  4. Next, determine the salvage value ($).
  5. Next, determine the useful life (in years).
  6. Finally, calculate the Rok using the formula: Rok = (Annual Cash Inflows – Annual Cash Outflows + Salvage Value) / Initial Investment * 100.

Example Problem:

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

Initial Investment ($) = 5000

Annual Cash Inflows ($) = 2000

Annual Cash Outflows ($) = 1500

Salvage Value ($) = 1000

Useful Life (in years) = 5