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Lump sum calculator
What one amount left to grow comes to at the rate you assume, and when it doubles. Free, with no account or uploads.
Leave it to grow
Type the amount and the rate you assume.
Your own assumption: real returns go up and down.
For
1 year3 years5 years10 years15 years20 years25 years30 yearsYour own
If it grew at 7% every year
$20,097 after 10 years
$10,000 put in and $10,097 of growth. Real returns go up and down; this is the arithmetic of one steady rate.
At 7% money doubles in about 10.3 years by the rule of 72; exactly 10.2.
Put inGrowth
Show the numbers as a table
| Year | Put in | Growth |
|---|---|---|
| Year 1 | $10,000 | $723 |
| Year 2 | $10,000 | $1,498 |
| Year 3 | $10,000 | $2,329 |
| Year 4 | $10,000 | $3,221 |
| Year 5 | $10,000 | $4,176 |
| Year 6 | $10,000 | $5,201 |
| Year 7 | $10,000 | $6,300 |
| Year 8 | $10,000 | $7,478 |
| Year 9 | $10,000 | $8,742 |
| Year 10 | $10,000 | $10,097 |
Interest is compounded
YearlyQuarterlyMonthlyDaily
This is arithmetic on the numbers you type, not financial advice. Rates, fees and rules differ by lender and place. Worked out in your browser; nothing you type is sent anywhere.
A little help along the way
Follow these steps. Every option is explained underneath. Everything runs in your browser; nothing is sent anywhere.
- Say what you are saving withMoney each month, a lump sum, both, a fixed or recurring deposit, or taking money out.
- Type the amounts and a rateThe rate is your own assumption; real returns go up and down.
- Choose the yearsCommon lengths are one press away.
- Read the answerWhat it comes to, what you put in and what it grew by, and when it doubles.
Questions people ask
- When does it double?
- The page gives the years by the rule of 72 and exactly, at the rate you assume.
- What is today's money?
- The result divided by inflation for each year, to compare with prices now; turn it on under More options.
- Is the rate a forecast?
- No. It is your own assumption; real returns go up and down.
This page is the Savings calculator, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the Savings calculator's own page.
Read the step-by-step guide