Question 1

Is a lump sum of $25,000 better than depositing it monthly over 15 years?

Accepted Answer

For growth, yes. $25,000 invested at the start reaches $61,352. The same money split into 180 equal monthly deposits reaches only $40,391 at 6 percent because most of it spends less time growing. Monthly deposits suit a budget while a lump sum suits cash you already have.

Question 2

Is 15 years long enough for $25,000 to double at 6 percent?

Accepted Answer

$25,000 reaches $50,000 after about 11.6 years. So 15 years is more than enough. A quick check is to divide 72 by the rate, which gives 12 years.

Question 3

What if the return on $25,000 over 15 years were one point lower than 6 percent?

Accepted Answer

At 5 percent the balance after 15 years is $52,843 instead of $61,352. One point higher gives $71,224.

Question 4

What is $61,352 worth after prices rise 2.5 percent a year?

Accepted Answer

If prices rise at 2.5 percent a year for 15 years the final balance has the buying power of about $42,362 in starting-year money. Enter your own inflation rate in the calculator to test other cases.

Year	Total put in	Balance
1	$25,000	$26,542
2	$25,000	$28,179
3	$25,000	$29,917
4	$25,000	$31,762
5	$25,000	$33,721
6	$25,000	$35,801
7	$25,000	$38,009
8	$25,000	$40,354
9	$25,000	$42,842
10	$25,000	$45,485
11	$25,000	$48,290
12	$25,000	$51,269
13	$25,000	$54,431
14	$25,000	$57,788
15	$25,000	$61,352

$25,000 Compound Interest Over 15 Years

How the growth is worked out

Worked example

Questions about this calculator

Is a lump sum of $25,000 better than depositing it monthly over 15 years?

Is 15 years long enough for $25,000 to double at 6 percent?

What if the return on $25,000 over 15 years were one point lower than 6 percent?

What is $61,352 worth after prices rise 2.5 percent a year?

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