Inflation Calculator
Find what US dollars from any month or year since 1913 are worth in another, using the official CPI, or apply a flat inflation rate forward or back.
Change the values and press Calculate to work out your own figures.
US CPI, 1913 to now
Enter an amount, when it's from and when to compare.
Show the working
- value = amount × CPI(to) ÷ CPI(from)
- CPI-U, US city average, all items, not seasonally adjusted (BLS)
Flat rate, forward
Enter an amount, a rate and the years ahead.
Show the working
- future = amount × (1 + rate)^years
Flat rate, back
Enter an amount, a rate and the years ago.
Show the working
- past = amount ÷ (1 + rate)^years
How to use it
Enter an amount, when it's from and when to compare. Enter an amount, a rate and the years ahead. Enter an amount, a rate and the years ago.
Enter amounts without commas or with them; rates are percentages (5 for 5%). Negative amounts are allowed where a sign means money paid out.
Key facts
value = amount × CPI(then) ÷ CPI(from) flat rate: forward = amount × (1 + rate)^years; back = amount ÷ (1 + rate)^years
The data
CPI-U is the price index for all urban consumers, US city average, all items, not seasonally adjusted (1982–84 = 100). A year's average is the mean of its twelve months.
Questions
What is $100 from 2016 worth in August 2026?
$139.57, by the CPI-U.
Why can't I choose October 2025?
BLS didn't publish that month's CPI.
Formulas
value = amount × CPI(then) ÷ CPI(from) flat rate: forward = amount × (1 + rate)^years; back = amount ÷ (1 + rate)^years
Sources
Limitations
- Results are estimates for planning, not offers or financial advice; lenders and banks may round, count days or time payments differently.
- Rates are nominal annual rates compounded as you choose; payments at a different frequency use the equivalent periodic rate.