Measure increase or decrease between two numbers.

Compare a before and after value and get both the raw difference and the percentage change.

Math Cluster

Measure percentage increase or decrease fast

This is the common before-and-after calculator: compare two values, see the raw difference, and get the percent change without working it out manually.

Starting valueThe original or earlier number before the change happened.Ending valueThe new or later number you want to compare against the start.

Useful examples

Revenue went from 120 to 150.
A price dropped from 80 to 64.
Traffic rose from 10,000 to 13,200.

Math lane

Useful for prices, traffic, sales, and reporting

This is the basic before-versus-after calculator people need for dashboards, pricing changes, growth rates, and quick sanity checks in plain English.