Project your S&P 500 returns in pounds. See how a lump sum or monthly contributions could grow inside a Stocks & Shares ISA, based on the historical 8-10% average return.
The S&P 500 is a stock market index that tracks the 500 largest publicly traded companies in the United States, weighted by market capitalisation. It includes giants like Apple, Microsoft, Nvidia, Amazon, Google (Alphabet), Meta, Berkshire Hathaway, JPMorgan, Tesla, and roughly 490 others. Together, these 500 companies represent about 80% of the total US stock market value.
Because it is market-cap weighted, larger companies have a bigger influence on the index. The top 10 holdings — mostly technology — make up roughly 30% of the index by value. This concentration is one of the reasons the S&P 500 has performed so well over the past two decades, as US technology companies have dominated global growth.
For UK investors, the S&P 500 is one of the simplest and cheapest ways to gain exposure to the largest engine of global growth. You do not need to pick individual stocks — you simply buy a single ETF that holds all 500 companies in their correct proportions.
Last 10 years
~11% / yr
Tech-led bull market
Last 20 years
~9% / yr
Includes 2008 crash and 2020 dip
Last 30 years
~8.5% / yr
Includes dot-com bubble
Sterling-equivalent returns are approximate and include reinvested dividends. They include the effect of GBP/USD currency movements over each period. Past performance does not guarantee future results. Capital is at risk.
The table below projects what £10,000 lump sum, £100/month, and £500/month could grow to inside a Stocks & Shares ISA, assuming an 8% average annual return in sterling terms (in line with the long-run average for UK investors).
| Period | £10k lump sum | £100/month | £500/month |
|---|---|---|---|
| 5 years | £14,700 | £7,400 | £37,000 |
| 10 years | £21,600 | £17,800 | £89,000 |
| 20 years | £46,600 | £54,000 | £270,000 |
| 30 years | £100,600 | £127,000 | £635,000 |
Based on 8% average annual returns, compounded monthly. Assumes returns are reinvested and held inside a tax-free ISA wrapper. Past performance does not guarantee future results. Capital at risk — the value of your investments can fall as well as rise.
UK investors cannot buy a US-listed ETF directly (under PRIIPs regulations), so you need to use a UCITS-compliant European version of an S&P 500 tracker. There are several excellent options available on every major UK platform:
Vanguard S&P 500 UCITS ETF (VUSA) — 0.07% ongoing charge, accumulating and distributing variants available, the most popular S&P 500 ETF on Trading 212.
iShares Core S&P 500 UCITS ETF (CSP1 / CSPX) — 0.07% ongoing charge, very large fund (over $80bn AUM), available on most UK platforms.
Invesco S&P 500 UCITS ETF (SPXP) — 0.05% ongoing charge, slightly cheaper alternative, though smaller fund size.
All three track the same underlying index and produce nearly identical returns. The differences are tiny — pick whichever your platform offers and has the lowest cost. Hold it inside a Stocks & Shares ISA so all dividends and capital gains are tax-free, and reinvest dividends automatically by choosing the accumulating (Acc) version.
The S&P 500 is not the only option for UK investors, and it is worth understanding how it compares to the alternatives. Each has different strengths.
S&P 500. Strongest historical performance (driven by US tech), highest concentration risk (100% US, 30%+ in top 10 holdings), exposure to the world's most innovative companies. Best for those who believe US dominance will continue.
FTSE 100. UK-listed companies (banks, oil, miners, pharmaceuticals), much higher dividend yield (around 4% vs 1.5% for the S&P 500), much lower historical growth. Best for income-focused investors or those wanting UK exposure.
FTSE All-World / Global index. Holds thousands of companies across developed and emerging markets, including the S&P 500 as roughly 60% of its weight. This is the textbook "diversified" choice — you get the benefit of US tech alongside exposure to Europe, Asia, and emerging markets. Slightly lower historical return than the S&P 500 alone, but lower concentration risk.
For most UK investors, a global index fund like Vanguard FTSE All-World (VWRL) is the more diversified choice. The S&P 500 makes sense if you specifically want US exposure or believe the US will continue to outperform — and many investors hold both.
When you buy an S&P 500 ETF in pounds, the underlying assets are still US dollars. The ETF converts the pound value behind the scenes, so your returns include both the price movement of the index AND the GBP/USD exchange rate movement.
If the pound weakens against the dollar (as in 2016 and 2022), your sterling returns are boosted. If the pound strengthens, your returns are reduced — even if the index goes up. Over short periods, this can add significant volatility to your returns.
Over long periods (10+ years), currency effects tend to average out and matter less than the underlying index performance. Most long-term investors do not bother hedging currency risk — the cost (slightly higher ongoing charges on hedged ETFs) usually outweighs the benefit. If you specifically want to remove currency risk, look for "GBP-hedged" ETF variants like VUSA's hedged class.
Run your own S&P 500 projection in £ with our free compound interest calculator.
Open compound interest calculatorSet your starting amount, monthly contribution, expected return (8% is a reasonable long-run S&P 500 estimate), and time horizon.
Trading 212 is the most popular UK platform for S&P 500 ETFs. Buy VUSA, CSP1 or any other UCITS S&P 500 tracker with zero commission, from as little as £1, inside a free Stocks & Shares ISA.
Capital at risk. This is not financial advice. Affiliate link — we may earn a commission at no extra cost to you.
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