How much is $100 in 1978 worth today?

$100 in 1978 is worth $513.77 in August 2026 dollars, according to the U.S. Consumer Price Index.

How much would I need today to match $100 in 1978?

You would need $513.77 to buy what $100 bought in 1978. That is 5.14 times as much.

Kept as cash, $100 from 1978 buys only what $19.46 of 1978 money bought. It has lost 81% of its buying power.

Prices rose 7.6% in 1978. Since then the average has been 3.46% a year.

$100 in 1978 has the same buying power as

$513.77 in August 2026

That is 414% more, an average inflation rate of 3.46% a year over 48 years.

Put the other way, $100 today buys what $19.46 bought in 1978. Cash kept under the mattress since 1978 has lost 81% of its value.

$100 from 1978 in each later year's dollars

Not everything rose at the same pace. What $100 spent on each of these in 1978 costs today:

Amount ($) From year From month To year To month

$100.00 in 1978 has the same buying power as

$513.77 in August 2026

Prices rose 413.8% in total, an average of 3.46% a year.

How much is $100 in 1978 worth today?: $100 in 1978 is worth $513.77 in August 2026 dollars, according to the U.S. Consumer Price Index.
How much would I need today to match $100 in 1978?: You would need $513.77 to buy what $100 bought in 1978. That is 5.14 times as much.
How much buying power has $100 lost since 1978?: Kept as cash, $100 from 1978 buys only what $19.46 of 1978 money bought. It has lost 81% of its buying power.
What was inflation in 1978?: Prices rose 7.6% in 1978. Since then the average has been 3.46% a year.