A salary of $50,000 in 2000 and a salary of $50,000 in 2026 are not the same amount of money. The 2000 salary, adjusted for inflation, is equivalent to roughly $90,000 in 2026 dollars. If you are earning $50,000 today, you have significantly less purchasing power than someone earning the same nominal amount 26 years ago.
This is what inflation does. It is a slow, steady erosion of purchasing power that most people underestimate because it operates on timescales longer than human intuition tracks well.
How the CPI works
The Consumer Price Index (CPI) measures inflation by tracking the price of a basket of goods and services over time. The Bureau of Labor Statistics (BLS) surveys prices for roughly 80,000 items monthly, weighted by how much the average consumer spends on each category:
- Housing: ~33% of the basket
- Transportation: ~17%
- Food: ~14%
- Medical care: ~9%
- Education and communication: ~7%
- Recreation: ~6%
- Other: ~14%
The annual inflation rate is the percentage change in the CPI. If the CPI was 300 last year and 309 this year, inflation was 3%.
The compounding effect
Inflation compounds, just like interest. At 3% annual inflation:
- After 1 year: $100 of purchasing power becomes $97.09
- After 10 years: $100 becomes $74.41
- After 20 years: $100 becomes $55.37
- After 30 years: $100 becomes $41.20
This means that $100 saved in a checking account (earning essentially 0%) loses 59% of its purchasing power over 30 years at 3% inflation.
The formula:
Adjusted value = Original value * (1 + inflation rate) ^ years
Purchasing power = Original value / (1 + inflation rate) ^ years
Your salary vs inflation
If you get a 3% raise and inflation is 3%, your purchasing power is unchanged. You did not get a real raise. A real raise exceeds the inflation rate. If inflation is 3% and your raise is 5%, your real raise is approximately 2% (more precisely: (1.05/1.03) - 1 = 1.94%).
Over a career, the difference between salary growth that matches inflation and salary growth that exceeds it by 2% is enormous:
- $60,000 starting salary, 3% annual raises (matching inflation): still $60,000 in real terms after 30 years
- $60,000 starting salary, 5% annual raises (2% above inflation): $108,000 in real terms after 30 years
Job changes and promotions are the primary mechanism for beating inflation. Average annual raises within a company are 3-4%, roughly matching inflation. Average salary increase from changing jobs is 10-20%.
Inflation varies by category
The overall CPI is an average. Individual categories inflate at very different rates:
- College tuition: ~6-8% annually over the past 20 years
- Healthcare costs: ~4-5% annually
- Housing in major metros: ~5-7% annually
- Technology: often deflationary (a $1,000 laptop today is far more powerful than a $1,000 laptop from 2010)
- Food: ~2-3% annually in normal years
Your personal inflation rate depends on your spending pattern. If you are paying for healthcare and college tuition, your real inflation rate is significantly higher than the headline CPI number.
Investment returns in real terms
When evaluating investment returns, always think in real (inflation-adjusted) terms:
| Investment | Nominal Return | Real Return (3% inflation) |
|---|---|---|
| Savings account | 0.5% | -2.5% |
| Bonds | 4% | 1% |
| S&P 500 historical avg | 10% | 7% |
| Real estate | 7% | 4% |
A savings account at 0.5% is not "safe." It is guaranteed to lose purchasing power. The safest investment in real terms is one that reliably beats inflation.
I built an inflation calculator at zovo.one/free-tools/inflation-calculator that adjusts dollar amounts between any two years using historical CPI data. Enter an amount and year, and see what it equals in today's dollars (or any other year). Useful for salary comparisons, historical price analysis, and understanding the real value of financial milestones over time.
I'm Michael Lip. I build free developer tools at zovo.one. 500+ tools, all private, all free.
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