Price Change Calculation
This tool calculates the change between two prices as an amount and a percentage. A positive result means an increase; a negative result means a decrease.
Calculating…
Calculation formula
Change rate (%) = (Change ÷ Old price) × 100
How to interpret it?
Percentage change is always calculated relative to the starting value. That is why increases and decreases are not symmetrical: a drop from 100 TL to 50 TL is a 50% decrease, but a rise from 50 TL to 100 TL is a 100% increase.
Using this calculation regularly when tracking competitor prices is more meaningful than looking at individual numbers. The average change rate in the category shows whether a single competitor's move or a general trend is at play.
Limitations: what does this tool not calculate?
It does not explain the reason. This calculation does not tell whether the change is a campaign or a lasting positioning.
It compares only a single pair of prices. For time-series analysis, measurements must be recorded with their dates.
Shipping and campaigns are excluded. The total amount the customer pays may differ.
Frequently asked questions
How is percentage change calculated?
The old price is subtracted from the new price, the result is divided by the old price, and multiplied by 100.
Why does a 50% decrease and a 100% increase occur between the same two prices?
Because the percentage is always calculated relative to the starting value, increases and decreases are not symmetrical.
How is it used in tracking competitor prices?
By recording each measurement with its date and calculating the change rate, you can distinguish a lasting move from a temporary campaign.
Related pages
Last updated: September 10, 2026