Purchasing power decreased by 2.70% in 2018 compared to the previous year, 2017. On average, you would have to spend 2.70% more money in 2018 than in 2017 for the same item.
In other words, $100 in 2017 is equivalent in purchasing power to $102.87 in 2018.
The 2017 inflation rate was 2.13%. The current inflation rate (2017 to 2018) is now 2.70%1. If this number holds, $100 today will be equivalent to $102.70 next year. The current inflation rate page gives more detail on the latest official inflation rates.
Inflation rate is calculated by change in the consumer price index (CPI). The CPI in 2018 is 252.146. It was 245.12 in the previous year, 2017. The difference in CPI between the years is used by the Bureau of Labor Statistics to officially determine inflation.
|Average inflation rate||2.70%|
|Converted amount ($100 base)||$102.87|
|Price difference ($100 base)||$2.87|
|CPI in 2017||245.12|
|CPI in 2018||252.146|
|Inflation in 2017||2.13%|
|Inflation in 2018||2.70%|
Inflation can vary widely by city, even within the United States. Here's how some cities fared in 2017 to 2018 (figures shown are purchasing power equivalents of $100):
San Francisco, California experienced the highest rate of inflation during the 1 years between 2017 and 2018 (3.13%).
San Diego, California experienced the lowest rate of inflation during the 1 years between 2017 and 2018 (0.00%).
Inflation can also vary widely by country. For comparison, in the UK £100.00 in 2017 would be equivalent to £102.20 in 2018, an absolute change of £2.20 and a cumulative change of 2.20%.
In Canada, CA$100.00 in 2017 would be equivalent to CA$102.22 in 2018, an absolute change of CA$2.22 and a cumulative change of 2.22%.
Compare these numbers to the US's overall absolute change of $2.87 and total percent change of 2.87%.
CPI is the weighted combination of many categories of spending that are tracked by the government. This chart shows the average rate of inflation for select CPI categories between 2017 and 2018.
Compare these values to the overall average of 2.70% per year:
|Category||Avg Inflation (%)||Total Inflation (%)||$100 in 2017 → 2018|
|Used cars and trucks||0.20||0.20||100.20|
|Medical care services||1.94||1.94||101.94|
|Medical care commodities||1.32||1.32||101.32|
It's important to note that not all categories may be tracked since 2017. This table and visualization use the earliest available data for each category.
This inflation calculator uses the following inflation rate formula:
Then plug in historical CPI values. The U.S. CPI was 245.12 in the year 2017 and 252.146 in 2018:
$100 in 2017 has the same "purchasing power" or "buying power" as $102.87 in 2018.
To get the total inflation rate for the 1 years between 2017 and 2018, we use the following formula:
Plugging in the values to this equation, we get:
The above data describe the CPI for all items. Also of note is the Core CPI, which measures inflation for all items except for the more volatile categories of food and energy. Core inflation averaged 1.81% per year between 2017 and 2018 (vs all-CPI inflation of 2.70%), for an inflation total of 1.81%.
When using the core inflation measurement, $100 in 2017 is equivalent in buying power to $101.81 in 2018, a difference of $1.81. Recall that for All Items, the converted amount is $102.87 with a difference of $2.87.
In 2017, core inflation was 1.84%.
Chained CPI is an alternative measurement that takes into account how consumers adjust spending for similar items. Chained inflation averaged 1.97% per year between 2017 and 2018, a total inflation amount of 1.81%.
According to the Chained CPI measurement, $100 in 2017 is equal in buying power to $101.97 in 2018, a difference of $1.97 (versus a converted amount of $102.87/change of $2.87 for All Items).
In 2017, chained inflation was 1.76%.
To help put this inflation into perspective, if you had invested $100 in the S&P 500 index in 2017, your investment would be worth approximately $130.97 in 2018. This is a change of 30.97%.
This means the nominal return on a $100 investment is $30.97, but inflation would eat into your real returns.
Inflation would account for 2.79% of your returns ($0.86), for an inflation-adjusted real return of about $30.11.
Politics and news often influence economic performance. Here's what was happening at the time:
Raw data for these calculations comes from the Bureau of Labor Statistics' Consumer Price Index (CPI), established in 1913. Inflation data from 1665 to 1912 is sourced from a historical study conducted by political science professor Robert Sahr at Oregon State University.
You may use the following MLA citation for this page: “Inflation Rate in 2018 | Inflation Calculator.” U.S. Official Inflation Data, Alioth Finance, 11 Oct. 2018, https://www.officialdata.org/inflation-rate-in-2018.