📝 The Power of Compound Interest
Albert Einstein reportedly called compound interest "the eighth wonder of the world. He who understands it, earns it; he who doesn't, pays it." This calculator shows exactly why – and how you can harness this power for your own wealth.
🔢 The Compound Interest Formula
A = P(1 + r/n)^(nt)
Where A = final amount, P = principal, r = annual interest rate, n = compounding frequency, t = time in years
Example: £10,000 at 7% compounded monthly for 10 years = £20,096
📊 UK Investment Returns (2026)
- FTSE 100 Index: 7-8% average annual return
- Global Equities: 8-10% average annual return
- Stocks & Shares ISA: Tax-free growth
- Property Investment: 4-6% yield + appreciation
💡 The Magic of Starting Early
- Start at 25: £500/month at 7% = £1.2M at 65
- Start at 35: £500/month at 7% = £566,000 at 65
- Start at 45: £500/month at 7% = £245,000 at 65
- The difference: Starting 10 years earlier doubles your wealth
⚡ The Rule of 72
The Rule of 72 tells you how long it takes to double your money: 72 ÷ Interest Rate = Years to Double
- At 7%: 72 ÷ 7 = 10.3 years to double
- At 10%: 72 ÷ 10 = 7.2 years to double
- At 12%: 72 ÷ 12 = 6 years to double
🎯 Your Action Plan
- Start investing today – don't wait for the perfect time
- Set up automatic monthly contributions
- Reinvest all dividends and interest
- Use tax-advantaged accounts (ISA, Pension)
- Review and increase contributions annually
🌟 Real Wealth Examples
- Warren Buffett: 99% of his wealth came after age 50 (compound interest!)
- £10,000 at 7% for 40 years: £149,744
- £10,000 at 10% for 40 years: £452,592
- £10,000 at 12% for 40 years: £930,509