Personal Inflation Rate Calculator
What you spend a month, and how those prices changed
Your result will appear here
Fill in the fields on the left and this updates as you type.
Know what this estimate is based on
- Jurisdiction
- General mathematical model
- Scope and limitations
- Educational estimate only. Confirm the assumptions, current rules, fees, and rounding that apply to your situation before making a decision.
- Source links checked
- Jul 30, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
How to use
- 01
Enter what your household spends in a typical month in each of the nine categories, and leave 0 for anything you do not buy.
- 02
For shelter, enter your rent, or your mortgage payment with property tax and home insurance. Read the note on fixed-rate mortgages before you rely on the result.
- 03
For vehicles, enter what you spend buying cars averaged over the months, not a fixed loan payment on a car you already own.
- 04
Open Advanced options if you want to replace any category's 12-month price change with your own figure; each one starts at the Bureau of Labor Statistics rate to August 2026.
- 05
Read your rate against the 3.4% headline, then the table of what each category adds and the extra you pay a year for the same things.
Formula
For each category, last year's cost = this month's spending ÷ (1 + that category's 12-month price change). Your rate = total spending now ÷ total last-year cost − 1. A category's contribution in percentage points = (its spending now − its last-year cost) ÷ total last-year cost × 100, and the contributions add up to your rate. Extra a year = (total now − total last-year cost) × 12. The headline comparison is the CPI-U change from August 2025 to August 2026.
Example
A household spends $5,270 a month: $1,800 on shelter, $650 on groceries, $350 eating out, $220 on gasoline, $200 on household energy, $400 on medical care, $300 buying vehicles, $150 on clothing and $1,200 on everything else. At last year's prices the same spending would have cost $5,085, so this household's inflation rate is 3.6%, 0.2 points above the 3.4% headline. The same things cost $185 more a month, $2,222 a year, against $2,072 at the headline rate. Shelter adds the most, 1.03 points from 34.2% of spending, and extra costs $629 a year. Gasoline is only 4.2% of spending, but at a 27.9% price rise it adds 0.94 points and $576 a year. Without the two energy lines the rate would be 2.7%, and for an owner whose shelter cost has not moved, setting shelter to 0% gives 2.6%.
Definitions
- Personal inflation rate
- The change in what your own mix of spending costs over a period, weighting each category's price change by its share of your budget.
- Headline CPI
- The 12-month change in the CPI-U for all items, the most widely quoted inflation figure. It was 3.4% for the 12 months to August 2026.
- Owners' equivalent rent
- The CPI's measure of housing costs for homeowners: what an owner would pay to rent the home, not the mortgage payment or the price of the house.
- Contribution
- How many percentage points one category adds to your overall rate, based on its share of spending and its price change.
- Not seasonally adjusted
- Index values as collected, without removing regular seasonal patterns. Year-over-year changes are normally figured from these.
Good to know
Why your inflation rate is not the headline number
The headline inflation rate is a weighted average. The Bureau of Labor Statistics prices thousands of goods and services and combines their changes according to how much urban consumers as a whole spend on each. The result, 3.4% for the 12 months to August 2026, describes that average spending pattern well. It describes any particular household only as far as that household spends like the average. Two households facing exactly the same prices can end up with different inflation rates because they buy different things. A family that rents, drives long distances and eats out often is exposed to different price changes than a retired couple who own their home outright and rarely drive. This page makes that difference visible by weighting each category's official price change by your own monthly spending. On the example budget of $5,270 a month, the same purchases would have cost $5,085 a year earlier. That is a personal rate of 3.6%, 0.2 points above the headline. The household pays $185 a month more for the same things, or $2,222 a year, compared with $2,072 if its prices had risen at exactly the headline rate. The composition matters more than the total. In the example, shelter adds the most, 1.03 percentage points, simply because it takes 34.2% of spending. Gasoline takes only 4.2% of the budget but adds 0.94 points, because its price rose so sharply. Take out the two energy lines and the rate falls to 2.7%. Nothing about this means the official figure is wrong. It is designed to measure average price change, not the change for every family. What it does mean is that the number to plan around, for a budget, a raise request or a savings goal, is your own rate, and that rate moves with your spending pattern, which is easier to change than prices.
Shelter, rent and the homeowner question
Shelter is the largest part of most budgets and the most misunderstood part of the CPI. In the index, shelter is not house prices and not mortgage payments. It is made up mainly of rent of primary residence, which rose 2.7% in the 12 months to August 2026, and owners' equivalent rent, which rose 3.1%. Owners' equivalent rent is an estimate of what homeowners would have to pay to rent the homes they live in. The Bureau of Labor Statistics measures housing this way because a home is partly an investment, and the index is meant to capture the cost of the shelter a home provides rather than the rise or fall in its value. Shelter as a whole rose 3.0% over the year. For renters, that measure is close to their own experience, although a renewal in a fast-moving local market can run well above or below the national figure. For homeowners with a fixed-rate mortgage, the experience is very different. The principal and interest payment does not change from one year to the next, whatever happens to rents. What does move is property tax, homeowners insurance, maintenance and, for some, homeowners association dues. If you own on a fixed-rate loan, the fairer entry on this page is to put your full housing cost in the shelter line and replace the shelter rate under Advanced options with the change you actually saw. For a payment that has not moved at all, that is 0%. On the example budget, that single change brings the personal rate from 3.6% down to 2.6%. The opposite holds for anyone with an adjustable-rate mortgage that recently reset, or who bought a home recently at a higher price and rate: their shelter cost may have risen far more than any index. Use your own figure, because shelter is where a national average fits individual households least well.
Energy, cars and the categories that swing
Some categories move slowly and predictably. Others swing, and they are the ones most likely to pull your rate away from the headline. Energy is the clearest example. In the 12 months to August 2026 the CPI for motor fuel rose 27.9%, energy as a whole rose 16.3%, and household energy, meaning electricity, piped gas, heating oil and propane, rose 5.0%. A household that commutes by car and heats with oil will feel that very differently from one that lives near work in an apartment with electric heat. In the example, gasoline is only $220 of a $5,270 month, yet it adds 0.94 percentage points to the personal rate and $576 a year. Vehicles show that swings can run the other way too. Prices for new and used motor vehicles fell 0.4% over the year, with new vehicles up 0.6% and used cars and trucks down 2.3%. But the vehicle line on this page is easy to misuse. The CPI prices vehicles when they are bought. A loan payment on a car you already own was fixed when you signed and does not change with prices, so it should not be counted in this line at all. Enter what you spend buying vehicles, averaged over the months between purchases, and leave the payment out. Car insurance and repairs belong in everything else. Food splits along similar lines. Food at home rose 2.2%, while food away from home rose 3.4%. A household that shifts spending from restaurants to groceries changes its own rate without any change in prices. Medical care rose 1.6%, and apparel 3.6%. Because categories can move this far apart, a budget that looks similar to the average in total can still carry a rate well above or below the headline, depending on which lines take the most money.
Using the category rates well
Every category rate on this page starts at a published Bureau of Labor Statistics figure: the change in a CPI-U index for the U.S. city average, not seasonally adjusted, from August 2025 to August 2026, as released on 11 September 2026. The series are shelter (CUUR0000SAH1), food at home (CUUR0000SAF11), food away from home (CUUR0000SEFV), motor fuel (CUUR0000SETB), household energy (CUUR0000SAH21), medical care (CUUR0000SAM), new and used motor vehicles (CUUR0000SETA) and apparel (CUUR0000SAA). One rate is different. Everything else, the spending outside those eight lines, starts at the headline rate of 3.4%. That is an assumption, not a measured figure, because no single published series covers exactly what is left: phone and internet service, car insurance and repairs, recreation, personal care, household goods and more. If that line holds a large share of your budget, the page says so, and it is worth replacing with a figure you know. The best replacements come from your own records. If your car insurance renewal rose by a known percentage, or your electricity rate changed, or your rent renewal is set, those are more accurate for you than any national number. A few habits make the result more useful. Use typical monthly spending rather than a single unusual month, and average bills that arrive yearly or quarterly. Keep categories consistent with their definitions: property tax and home insurance with shelter, restaurant meals with food away from home. And revisit the page when new data arrive, because the Bureau of Labor Statistics releases the CPI monthly and 12-month changes can shift quickly, especially for energy. The answer is still a national-price view of your own mix. Prices where you live and where you shop can differ, and BLS also publishes indexes for regions and large metro areas that can stand in for the national rates.
Frequently asked questions
What is a personal inflation rate?
It is the rise in the cost of the things you buy, weighted by how much of your budget each category takes. The headline CPI-U weights prices by the spending of urban consumers as a whole. This page uses your own mix instead. A household spending $5,270 a month in the example's pattern has a personal rate of 3.6% for the 12 months to August 2026, against a headline rate of 3.4%.
Why does inflation feel higher than the official rate?
Often because of what you buy most. Prices for motor fuel rose 27.9% in the 12 months to August 2026 while new and used vehicles fell 0.4%. In the example, gasoline is only 4.2% of spending but adds 0.94 percentage points to the rate, and without the two energy lines the rate would be 2.7%. The things bought most often, like gas and groceries, also shape how inflation feels more than a car bought every few years.
I own my home with a fixed-rate mortgage. What should I enter?
In the CPI, shelter is rent of primary residence, up 2.7% over the year, and owners' equivalent rent, up 3.1%, which estimates what owners would pay to rent their homes. Neither is a mortgage payment. If your principal and interest are fixed, set the shelter rate under Advanced options to your own change, counting only property tax, insurance and upkeep. In the example, setting shelter to 0% would bring the rate from 3.6% to 2.6%.
Should I include my car payment?
Not as a vehicle purchase. A loan payment is fixed when you sign and does not rise with prices. The vehicle line is for money spent buying cars and trucks, averaged per month, and new and used vehicle prices changed by minus 0.4% over the 12 months to August 2026. Car insurance and repairs belong in everything else.
Where do the category rates come from?
Each is the 12-month change in a Bureau of Labor Statistics CPI-U index for the U.S. city average, not seasonally adjusted, from August 2025 to August 2026, released on 11 September 2026: shelter 3.0%, food at home 2.2%, food away from home 3.4%, motor fuel 27.9%, household energy 5.0%, medical care 1.6%, new and used motor vehicles minus 0.4% and apparel 3.6%. The everything-else rate is an assumption set to the 3.4% headline, because no single series covers exactly that mix.
How much more am I paying than a year ago?
The page reprices your current spending at last year's prices. In the example, the $5,270 a month would have cost $5,085 a year earlier, so the same things cost $185 more a month, or $2,222 a year. If those prices had risen at the headline rate instead, the increase would have been $2,072.