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5 Percent Inflation Over 20 Years

Test an inflation rate of 5 percent over 20 years. The page starts from $15,000 plus $250 a month at 6.5 percent.

Inflation of 5 percent cuts the $177,452 balance to a buying power of $66,880.

$
$
%
years
%
Final balance
$177,452
Total you put in
$75,000
Interest earned
$102,452
Final balance after inflation
$66,880
Year by year
YearTotal put inBalance
1$18,000$19,096
2$21,000$23,465
3$24,000$28,128
4$27,000$33,103
5$30,000$38,411
6$33,000$44,074
7$36,000$50,117
8$39,000$56,564
9$42,000$63,444
10$45,000$70,784
11$48,000$78,615
12$51,000$86,971
13$54,000$95,887
14$57,000$105,399
15$60,000$115,549
16$63,000$126,379
17$66,000$137,934
18$69,000$150,262
19$72,000$163,417
20$75,000$177,452
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How buying power is worked out

Each deposit earns interest from the month it arrives until the end. An early deposit grows for many months while a late one grows for few. The calculator adds up all 240 deposits of $250 at the monthly rate of 0.5417 percent to get the final balance. Two rates are at work. Your money grows at 6.5 percent a year while prices rise at 5 percent. The calculator divides the final balance by the price growth over 20 years to show its buying power.

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Worked example

With $250 a month at 6.5 percent the balance after 20 years is $177,452. You deposit $75,000 of it. Inflation is set to 5 percent.

Prices grow by a factor of 2.65 at 5 percent over 20 years. The final balance therefore buys about as much as $66,880 does at the start.

Questions about this calculator

What real return is left at 6.5 percent growth and 5 percent inflation over 20 years?

Roughly 1.4 percent a year over 20 years. That is how fast your buying power grows.

What if inflation were 6 percent instead of 5 percent over 20 years?

The balance would buy about $55,330 instead of $66,880.

How much would you need at the end to keep up with 5 percent inflation over 20 years?

$177,452 has the buying power of $66,880. To match $177,452 of buying power you would need $470,833 in future money.

Which inflation rate should I use for a 20-year plan when testing 5 percent?

Use a long-run average you are comfortable with. Prices rarely rise at a steady pace so test a low and a high case. Here 5 percent leaves $66,880 of buying power while 7 percent leaves $45,857 and 3 percent leaves $98,251.

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This page is for education only and is not financial or tax advice.