Year-over-Year Inflation Calculator
Compare matching months across years.
Year-over-Year Inflation Calculator: Scenario Inputs
Annual percentage rate or benchmark index change.
Inflation & Purchasing Power Analysis
Over 3 years at 3.5% inflation, a $75,000 salary requires $83,154 to retain equal purchasing power. Without matching raises, your real compensation experiences an effective reduction of $7,355 (-9.81%).
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How Year-over-Year Inflation Calculator Works?
The Year-over-Year Inflation Calculator compares the price index for the same month in two years. It divides the current index by the value from 12 months earlier.
Choose a month
Pick the month you want the YoY rate for, such as July.
Load both values
The calculator reads the index for that month and for the same month one year before.
Divide and subtract one
The ratio minus 1 gives the 12-month inflation rate.
Apply to salary
The calculator shows the raise needed for a salary to match that 12-month rate.
Year-over-Year Inflation Calculator Formula
The Year-over-Year Inflation formula divides this month's index by the index 12 months earlier and subtracts one.
YoY % = (CPImonth, year ÷ CPImonth, year−1 − 1) × 100
Salarynow = Salaryyear−1 × (1 + YoY)
Variables
- CPImonth, year
- Index value for the chosen month this year
- CPImonth, year−1
- Index value for the same month last year
Worked example
An index of 314.5 in July against 305.7 the July before gives 2.88% YoY inflation. A $64,000 salary needs to rise to $65,842 to match.
Year-over-Year Inflation Calculator Conversion Table
This table computes YoY inflation for 5 months from example index pairs, plus the raise each rate implies for a $64,000 salary.
| Month | Prior year index | Current index | YoY inflation | Matching salary |
|---|---|---|---|---|
| January | 299.2 | 308.4 | 3.07% | $65,968 |
| April | 303.4 | 313.5 | 3.33% | $66,131 |
| July | 305.7 | 314.5 | 2.88% | $65,842 |
| October | 307.7 | 315.7 | 2.60% | $65,664 |
| December | 306.7 | 315.6 | 2.90% | $65,857 |
Index values are illustrative examples for the calculation.
What is Year-over-Year Inflation Calculator?
The Year-over-Year Inflation Calculator is a tool that compares an index value for one month with the index value for the same month one year earlier. Year-over-year (YoY) inflation is the headline rate most statistics agencies report.
Comparing the same month removes seasonal swings, such as winter energy prices or summer travel prices, from the result.
What are the uses of Year-over-Year Inflation Calculator?
There are 4 main uses of the Year-over-Year Inflation Calculator.
Match an annual raise
Compare a raise effective in a given month with inflation over the 12 months before that month.
Read news releases
Recalculate the headline rate from published index values.
Remove seasonal noise
Avoid month-to-month swings by always comparing the same calendar month.
Track inflation trends
Follow how the 12-month rate rises or falls across a full year.
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