Percentage Price Increase Formula and Worked Examples
Percentage increases help compare old and new service prices.
Formula
Percentage increase = (new price - old price) / old price × 100. The denominator is the original price.
Examples
A move from $80 to $92 equals 15%. A move from £50 to £60 equals 20%.
Reverse calculation
To raise $80 by 15%, multiply it by 1.15. To recover the original amount from a raised price, divide by 1.15.
Revenue considerations
A 20% price rise can offset roughly 16.7% fewer transactions under constant-spend assumptions; it does not predict demand.
Three percentage increase examples
From $40 to $46: (46 − 40) / 40 × 100 = 15%. From £80 to £88: 10%. From $120 to $150: 25%. Always divide by the original price.
Decrease and reverse calculations
A price decreasing from $100 to $90 changes by −10%. If a new price is $115 after a 15% increase, the previous price was $115 / 1.15 = $100.
Do not reverse a 15% increase by subtracting 15% from the new amount: the percentage bases differ.
When to use the PriceBreakeven calculator
A percentage increase calculator answers how much the price changed. PriceBreakeven answers a different question: how much transaction volume can fall while preserving revenue after changing that price.