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Compound interest table: what $1,000 grows to

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$1,000 left to grow at 7% a year, compounded annually, becomes $1,967 after 10 years and $7,612 after 30 years. The money doubles roughly every 10.2 years at 7%, which the rule of 72 estimates as 72 ÷ 7 = 10.3 years.

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How to read these tables

  1. Choose the yearly return in the top row and the number of years in the left column.
  2. Read what $1,000 grows to, then multiply by your starting amount divided by 1,000.
  3. For regular deposits, use a compound interest calculator, because this table covers a single starting amount.
  4. Use the second table to see how long money takes to double at each rate.

Value of $1,000 after a number of years, interest compounded once a year

Value of $1,000 after a number of years, interest compounded once a year
Years3%4%5%6%7%8%10%12%
1$1,030$1,040$1,050$1,060$1,070$1,080$1,100$1,120
2$1,061$1,082$1,103$1,124$1,145$1,166$1,210$1,254
3$1,093$1,125$1,158$1,191$1,225$1,260$1,331$1,405
5$1,159$1,217$1,276$1,338$1,403$1,469$1,611$1,762
7$1,230$1,316$1,407$1,504$1,606$1,714$1,949$2,211
10$1,344$1,480$1,629$1,791$1,967$2,159$2,594$3,106
15$1,558$1,801$2,079$2,397$2,759$3,172$4,177$5,474
20$1,806$2,191$2,653$3,207$3,870$4,661$6,727$9,646
25$2,094$2,666$3,386$4,292$5,427$6,848$10,835$17,000
30$2,427$3,243$4,322$5,743$7,612$10,063$17,449$29,960
40$3,262$4,801$7,040$10,286$14,974$21,725$45,259$93,051

Years for money to double at a yearly rate

Years for money to double at a yearly rate
Yearly rateExact doubling timeRule of 72 estimate
2%35.0 years36.0 years
3%23.4 years24.0 years
4%17.7 years18.0 years
5%14.2 years14.4 years
6%11.9 years12.0 years
7%10.2 years10.3 years
8%9.0 years9.0 years
9%8.0 years8.0 years
10%7.3 years7.2 years
12%6.1 years6.0 years
15%5.0 years4.8 years

Method and assumptions

Formula. A = P × (1 + r)^t, where P is the starting amount, r is the yearly rate as a decimal and t is the number of years. Doubling time = ln 2 ÷ ln(1 + r).

Assumptions. One deposit, no withdrawals, a constant rate compounded once a year, before tax and fees. Real investments vary from year to year.

Every figure on this page is generated by the same functions that power our calculators, and our automated tests compare a sample of cells with published reference values. You may quote or reuse the tables if you link back to this page.

Frequently asked questions

What is the rule of 72?

It is a shortcut for the time money takes to double: divide 72 by the yearly percentage return. At 8% it gives 9 years, and the exact answer is 9.0 years.

How much is $1,000 worth after 30 years at 7%?

About $7,612 with annual compounding, which is 7.6 times the starting amount. More frequent compounding adds a little more.

Work out your own numbers

Compound Interest Calculator

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Inflation Calculator

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Simple Interest Calculator

Simple interest and total amount, compared with compound interest.

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