Enter the size and two different time periods and the total time that has passed between periods into the calculator to determine the relative growth rate.

## Relative Growth Rate Formula

The following equation is used to calculate a relative growth rate.

RGR = (ln (S2) – ln (S1) ) / (t2-t1)

- Where RGR is the relative growth rated
- S2 is the size at time 2
- S1 is the size at time 1
- t2-t1 is the change in time

## Relative Growth Rate Definition

A relative growth rate, or RGR for short, is defined as the growth rate relative to the size of the sample size. It’s also sometimes referred to as the exponential growth rate.

## Relative Growth Rate Example

How to calculate a relative growth rate?

**First, determine the initial size.**Calculate or measure the initial size.

**Next, determine the final size.**Calculate or measure the final size.

**Next, determine the change in time.**Calculate the total change in time from the initial to final sizes.

**Finally, calculate the relative growth rate.**Calculate the relative growth rate using the formula above.

## FAQ

**What is a relative growth rate?**

A relative growth rate is defined as the growth rate of a number relative to its size.