Direct answer
Personal Inflation Rate is Aspire's term for the weighted historical cost-growth rate of your selected future-goal basket. It is not CPI. It is not a spending tracker. It measures how fast the specific costs defining your future are compounding, at your assumptions.
How it differs from CPI
CPI asks: What happened to the average national consumer basket?
Personal Inflation Rate asks: What happened to the cost of the specific life you are trying to buy?
| Dimension | Personal Inflation Rate | CPI |
|---|---|---|
| What it measures | Weighted cost-growth of your specific future goals | Average price change of a national consumer basket |
| Basket | Your selected goals (housing, childcare, healthcare, education, retirement) | Fixed national basket of goods and services |
| Geography | Goal-specific (your zip, your metro) | National average |
| Weights | Based on your goal mix and future obligation sizes | Based on national consumer spending patterns |
| Data source | Trailing CAGRs from Zillow ZHVI, BLS, College Board, KFF | BLS Consumer Price Index |
| Best use | Measuring whether your future is getting more expensive | Tracking broad national price levels |
How it differs from other personal inflation calculators
Most personal inflation calculators — including those from the New York Times, Heritage Foundation, and Truflation — reweight the CPI basket based on your personal spending categories. If you spend more on gas, your personal CPI goes up. If you spend less on food, it goes down.
Aspire's Personal Inflation Rate is different. It does not reweight CPI. It uses the actual trailing cost-growth rates of your specific goals:
- A home in your city → Zillow ZHVI 10-year CAGR
- Childcare → BLS or KFF cost-growth data
- Healthcare → KFF employer health benefits survey
- Education → College Board trends in college pricing
These rates are often higher than CPI because they include asset-price growth (housing) and sector-specific cost inflation (healthcare, education) that CPI's basket structure may underweight or exclude.
Why this matters
If your Personal Inflation Rate is 6% and your portfolio is growing at 4%, you are falling behind by 2 points per year. That gap compounds. After 10 years, the cost of your future has grown 79% while your wealth has grown 48%.
CPI might say inflation is 3%. That number is real — for the national basket. But your future is not the national basket. Your future has its own inflation rate, and that rate is what determines whether your money can keep up with the life you want.
The formula
Personal Inflation Rate = sum of (goal weight × goal cost-growth rate)
Where:
- Goal weight = the share of your future cost stack this goal represents (may be weighted by future obligation size, not just today's dollars)
- Goal cost-growth rate = the trailing CAGR of that specific cost over the source window
Change the goal basket, weights, geography, timeline, or assumptions, and the rate changes.
The full derivation and source handling are on the methodology page.
What it is not
- It is not a prediction that past growth rates will repeat
- It is not investment advice
- It is not a claim that asset-price growth equals official inflation
- It is not a budget or spending tracker
It is a planning benchmark for future affordability, at your assumptions.