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See your money grow with compound interest - monthly contributions, inflation, milestones and year-by-year growth. Free and private.
Type in a starting amount and a monthly saving, and see exactly how much your money grows - with interest earning its own interest, year after year. Works in 49 currencies, with monthly, daily or yearly compounding, inflation adjustment and clear milestones. Everything is calculated on your device - nothing you type is ever saved or sent.
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Start amount, monthly saving, growth rate and years - sliders make it easy, results appear as you type.
The big green number is what you end up with - and how much of it is free money from interest.
Check the year-by-year table, spot your milestones, and share your result with one click.
Currently using: $ US Dollar
The money you already have saved. Zero is fine too!
The part that makes compounding powerful - even small monthly amounts grow big.
More often = slightly more money. Monthly is the most common.
In 10 years, your money grows to
$19,419
That includes $6,419 of free money from interest - 33% of the total!
You put in
$13,000
Interest adds
$6,419
Rule of 72
At 7%, your money doubles every 10.3 years
Milestone reached
You cross $10,000 in year 6
Does compounding frequency matter?
| Year | You Added | Interest Earned | Total |
|---|---|---|---|
| 1 | $1,200 | $119 | $2,319 |
| 2 | $1,200 | $214 | $3,733 |
| 3 | $1,200 | $316 | $5,249 |
| 4 | $1,200 | $426 | $6,875 |
| 5 | $1,200 | $544 | $8,619 |
| 6 | $1,200 | $670 | $10,488 |
| 7 | $1,200 | $805 | $12,493 |
| 8 | $1,200 | $950 | $14,642 |
| 9 | $1,200 | $1,105 | $16,947 |
| 10 | $1,200 | $1,272 | $19,419 |
Compound interest means your money earns money - and then that new money earns money too. It is a snowball: the longer it rolls, the bigger it gets.
Here is the simplest example: put 100 at 10% per year. After one year you have 110. In the second year you earn interest on 110, not 100 - so you end with 121. That extra 1 came from nothing but time.
The compound interest formula is: A = P(1 + r/n)^(nt) - where P is your starting amount, r is the yearly rate, n is how often interest is added, and t is the years. This calculator does that math for you, month by month, including every deposit you add.
The two biggest secrets: start early (time beats amount - 100 per month for 40 years beats 400 per month for 10 years), and never interrupt the snowball.
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