Enter the change in RPI (%) and the original ground rent ($) into the calculator to determine the RPI New Ground Rent. 

RPI New Ground Rent Formula

The following formula is used to calculate the RPI New Ground Rent. 

NGR = RPI / 100 * OGR + OGR

  • Where NGR is the RPI New Ground Rent ($)
  • RPI is the change in RPI (%) 
  • OGR is the original ground rent ($) 

How to Calculate RPI New Ground Rent?

The following example problems outline how to calculate RPI New Ground Rent.

Example Problem #1:

  1. First, determine the change in RPI (%). In this example, the change in RPI (%) is given as 10.
  2. Next, determine the original ground rent ($). For this problem, the original ground rent ($) is given as 1000.
  3. Finally, calculate the RPI New Ground Rent using the equation above: 

NGR = RPI / 100 * OGR + OGR

The values given above are inserted into the equation below:

NGR = 10 / 100 * 1000 + 1000 = 1100($)


Example Problem #2: 

The variables needed for this problem are provided below:

change in RPI (%) = 15

original ground rent ($) = 1500

Entering these values and solving gives:

NGR = 15 / 100 * 1500 + 1500 = 1725($)