How long might it take to double my money investing in FTSE 100 shares?

Our writer looks at different sets of figures to see how long it could take him to double his money by investing in FTSE 100 stocks.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

Stacks of coins

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

A 40-year chart of the FTSE 100 shows a rise from the bottom left upwards to the top right. Yet the index today is not too far ahead of where it was at the turn of the millennium. It was at 6,930 points as the celebratory fireworks flashed in the night sky on 31 December 1999. Today, it stands at 7,615, which is just under 10% higher.

Seeing the woods for the trees

While that is clearly disappointing, it fails to tell the whole story. That’s because those figures don’t include cash dividends, which have been flowing to shareholders from FTSE 100 firms every year this century.

Factor in those and the total return suddenly looks far better. Indeed, I would have doubled my money a few years back, even though the index has essentially gone nowhere since 1999.

Also, it’s important to remember that the global stock market back then was in the grip of the dotcom boom (soon to be bust). Look at Microsoft stock, for example. If I’d invested in the US software firm’s shares in January 2000, I would have waited until 2016 before I broke even again.

But surely if I’d still recognised Microsoft’s high quality — and why would I invest in a company if I didn’t? — I would have just bought more shares at a lower price. Doing so would have turbocharged my returns as the stock recovered and went onto new heights.

Similarly, investing more in FTSE 100 shares while they were down would have likewise been a winning strategy long term.

Doubling my money

Now, interest rates have gone up a lot over the last couple of years, meaning I can currently get a much better return from cash. If a savings account can give me a return of 5% per year, then it would take 14 years to double my money.

But the stock market’s returns have exceeded 5%. From 1984 to 2022, the FTSE 100 price return was approximately 645%, but the total return of the index (which includes reinvested dividends) was more than double that. On an annualised basis, this represents a total return of about 7.5%.

At this rate, it would take me nine and a half years to double my money.

Of course, there’s no guarantee that the Footsie will make returns of that level in the future.

Trying to beat the market

So far, I’ve assumed that I was passively investing in the whole of the FTSE 100. In reality, though, stock-pickers are unlikely to do so. They will select what they think are the best shares to generate market-beating returns.

If I’m able to actively pick FTSE 100 stocks that produce annual returns of around 11%, that would double my money in less than seven years. That’s due to the power of compound interest.

But how likely is that? Well, since 1965, Warren Buffett’s Berkshire Hathaway has returned an average of just under 20% per annum. But Buffett is one of the greatest investors ever, so I don’t think it’s likely to keep generating that average level of return.

But the great news is that I don’t need to. If my portfolio can just deliver average annual returns of 10%, I will do very well long term.

Ben McPoland has no position in any of the shares mentioned. The Motley Fool UK has recommended Microsoft. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Investing Articles

Is 2026 the year the Diageo share price bounces back?

Will next year be the start of a turnaround for the Diageo share price? Stephen Wright looks at a key…

Read more »

Investing Articles

Here’s my top FTSE 250 pick for 2026

UK investors looking for under-the-radar opportunities should check out the FTSE 250. And 2026 could be an exciting year for…

Read more »

Yellow number one sitting on blue background
Investing Articles

Here’s my number 1 passive income stock for 2026

Stephen Wright thinks a 5.5% dividend yield from a company with a strong competitive advantage is something passive income investors…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

Should I sell my Scottish Mortgage shares in 2026?

After a strong run for Scottish Mortgage shares, our writer wonders if he should offload them to bank profits in…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Down 35%! These 2 blue-chips are 2025’s big losers. But are they the best shares to buy in 2026?

Harvey Jones reckons he's found two of the best shares to buy for the year ahead, but he also acknowledges…

Read more »

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.
Investing Articles

State Pension worries? 3 investment trusts to target a £2.6m retirement fund

Royston Wild isn't worried about possible State Pension changes. Here he identifies three investment trusts to target a multi-million-pound portfolio.

Read more »

Smiling white woman holding iPhone with Airpods in ear
Dividend Shares

4 dirt-cheap dividend stocks to consider for 2026!

Discover four great dividend stocks that could deliver long-term passive income -- and why our writer Royston Wild thinks they’re…

Read more »

Young mixed-race woman jumping for joy in a park with confetti falling around her
Investing Articles

These fabulous 5 UK stocks doubled in 2025 – can they do it again next year?

These five UK stocks have more than doubled investors' money as the FTSE 100 surges. Harvey Jones wonders if they…

Read more »