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Personal finance

Compound interest

What your monthly saving turns into, and how much of it you actually put in.

%

An expectation, not a promise: the real result varies every year.

%

To see the result in today's purchasing power.

No currency on purpose: everything is in units of whatever money you use. That way the sum holds in any account and any country.

Total

167,740

What you put in

61,000

What interest puts in

106,740

From here on, interest contributes more than you do.

In today’s money

90,477

Inflation stripped out.

Years to double

10.3

What it is for

To see what steady saving looks like when given time, and above all to separate what you put in from what interest put in. That separation is the whole argument.

How to use it

  1. 1Enter what you already have and what you can genuinely set aside each month, not what you would like to.
  2. 2The annual return is an expectation. Try a bad scenario too: the gap between 7% and 4% over twenty-five years is surprising.
  3. 3Inflation does not change the total, it changes what the total will buy. Leave it in.

How to read it

Look at when interest overtakes contributions. That crossover arrives late —usually past fifteen or twenty years— and it is exactly why starting early beats contributing a lot.

The real total is the one that matters. A big number thirty years out does not buy what it looks like, and the gap between the two figures is what inflation takes.

Years to double comes from dividing 72 by the return. It is for doing the sum in your head without coming back here.

The terms that appear here

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