How to turn $100 a week into $500,000 with ASX shares

You don't need to invest large sums to become rich in the share market.

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Investing can seem daunting at first — especially if you're starting small. But here's the good news: you don't need a huge salary, a stock-picking superpower, or perfect timing to build serious wealth.

All it takes is consistency, patience, and a long-term mindset.

In fact, by simply investing the equivalent of $100 a week into quality ASX shares or exchange traded funds (ETFs), you could turn that into over $500,000 over time — without taking extraordinary risks.

Let's break down how it works.

The power of compounding

If you invest $100 per week — or $400 a month — and achieve an average 10% annual return, which is in line with historical averages (but not guaranteed), here's how your portfolio could grow:

  • After 10 years: $80,000
  • After 20 years: $290,000
  • After 25 years: $500,000

That's right — over half a million dollars just by steadily investing $100 a week and letting time and compounding do the heavy lifting.

Where to invest

To give themselves the best shot at a strong return, investors might want to focus on investing in high-quality ASX shares and ETFs — the kind of businesses and funds that can grow steadily over decades, not just quarters.

ETFs like iShares S&P 500 ETF (ASX: IVV) or Vanguard MSCI International Shares ETF (ASX: VGS) provide broad exposure to hundreds of US and global stocks.

Quality ASX shares like Wesfarmers Ltd (ASX: WES), ResMed Inc. (ASX: RMD), CSL Ltd (ASX: CSL), or WiseTech Global Ltd (ASX: WTC) offer strong fundamentals, reliable growth, and management teams that know how to create long-term value.

The goal isn't to chase hype — it is to own pieces of high-performing businesses that reinvest profits, grow earnings, and reward shareholders over time.

Time and discipline

It is not about how much you start with — it is about how long you stay invested.

An investor who quietly puts in $100 a week for 25 years will often end up far ahead of the person who starts with a bang but loses discipline.

Markets go up and down. News headlines come and go. But time in the market is what ultimately builds wealth.

Set up automatic contributions. Reinvest your dividends. Ignore the noise. Stick to your plan. Your future self will thank you.

Motley Fool contributor James Mickleboro has positions in CSL, ResMed, and WiseTech Global. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has positions in and has recommended CSL, ResMed, Wesfarmers, WiseTech Global, and iShares S&P 500 ETF. The Motley Fool Australia has positions in and has recommended ResMed and WiseTech Global. The Motley Fool Australia has recommended CSL, Vanguard Msci Index International Shares ETF, Wesfarmers, and iShares S&P 500 ETF. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Scott Phillips.

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