"Inflation is 3.4%" is an average across millions of households. But nobody buys the average basket. If your costs feel like they're rising much faster, or slower, than the news says, you may be right. Your personal inflation rate depends on what you actually spend money on.
How the CPI is weighted
The Bureau of Labor Statistics weights each category by how much of the average urban household's spending goes to it. These weights are called "relative importance." As of July 2026:
| Category | Share of the CPI |
|---|---|
| Shelter (rent and owners' housing costs) | 35.3% |
| Food (groceries and restaurants) | 13.5% |
| Energy (gasoline, electricity, utility gas) | 7.3% |
| Everything else (vehicles, medical care, apparel, services, etc.) | about 43.8% |
Source: U.S. Bureau of Labor Statistics, Consumer Price Index release for August 2026 (published September 11, 2026). Figures are 12-month, not seasonally adjusted changes for all urban consumers (CPI-U).
If your budget looks different, and most people's do, your inflation rate will be different too.
Four households, four inflation rates
Using the 12-month price changes to August 2026:
- The renter (rent up 2.7%) with an average budget: about 3.4%, right at the national rate.
- The homeowner with a fixed-rate mortgage: the biggest bill doesn't change, so the personal rate drops to roughly 2.5% on the same budget.
- The long-distance commuter: gasoline rose 27.4%, so doubling the gas budget pushes the personal rate to about 4.6%.
- The retiree who drives less but spends more on medical care, with medical care services up 2.5%, may land below the national average, although healthcare can dominate spending later in life.
These figures come from our Personal Inflation Rate Calculator, where you can enter your own numbers.
How to calculate your own rate
- List your monthly spending by category, using a few months of bank and card statements to get realistic numbers.
- Find each category's price change from the latest CPI release, or let our calculator do it.
- Multiply each category's spending by its price change, add them up, and divide by total spending.
For example, if you spend $250 on gas (+27.4%) and $750 on everything else (+2.4%), your rate is (250 × 27.4 + 750 × 2.4) ÷ 1,000 ≈ 8.7%. That's far above the average, because a volatile category is a large share of this small budget.
Why the gap matters
- Raises: compare your raise with your inflation rate. See is your raise beating inflation?
- Budgeting: focus cuts on the categories actually driving your costs.
- Retirement planning: retirees' spending often shifts toward healthcare and away from commuting and work costs. See inflation and retirement planning.
Frequently asked questions
Why doesn't the CPI include my mortgage payment?
The CPI treats buying a home as an investment, not consumption. For homeowners, it measures "owners' equivalent rent," an estimate of what renting the home would cost. That's why a fixed-rate mortgage payment doesn't move with the CPI.
Is there an official inflation rate for retirees?
The BLS publishes an experimental index for Americans 62 and older (CPI-E), which gives more weight to housing and healthcare. Social Security cost-of-living adjustments are based on a different index, the CPI-W, which covers urban wage earners and clerical workers.
How often should I recalculate?
Once or twice a year is enough, or whenever your spending changes significantly, such as after a move, a new car or retirement.