Investment & Portfolio Calculators
Understand how your investment choices and fees shape your long term outcomes. Compare growth rates, contribution levels and portfolio structures.
📈Investment Strategy
Your investment choices, fees, and portfolio structure significantly impact your retirement outcomes. These calculators help you compare ISAs, understand compound growth, and see how fees and tax drag affect long-term returns.
💼How these calculators help
Our Investment & Portfolio calculators model compound interest, compare Cash ISAs versus Stocks & Shares ISAs, calculate fee impacts, and show how different investment strategies affect your retirement timeline and wealth accumulation.
Start with these popular calculators
These six tools are the best starting point for understanding your investment options. They help you compare accounts, understand compound growth, calculate fee impacts, and see how different strategies affect your retirement timeline.
Cash ISA vs Stocks & Shares ISA Calculator
Cash is safe. Stocks can grow. See what the ISA wrapper actually does.
Lump Sum Investment Calculator
One lump, invested. What it might be worth later.
Home Bias vs Global Equity Calculator
How much of the pot is stuck in the UK, and what global shares change.
ISA Regular Contributions Calculator
Paying in each month, and what the annual ISA allowance lets you do.
ETF vs Managed Portfolio Fees Calculator
A small fee, every year, compounds the wrong way.
Cash vs Investing Opportunity Cost Calculator
Leaving it in cash has a cost. See it in pounds.
All Investment & Portfolio calculators
Browse all Investment & Portfolio calculators. These tools help you compare investment options, understand compound growth, calculate fee impacts, and see how different portfolio strategies affect your retirement timeline.
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Index Fund Comparison Calculator (UK)
Compare index fund and ETF charges, risk scores and past returns, and see what each charge costs in pounds.
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Bucket Strategy Retirement Calculator (UK)
Split your retirement pot into near-term cash, medium-term bonds and long-term growth buckets. See refill maths and runway.
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Capital Gains Harvesting / Bed-and-ISA Calculator (UK)
See how much of a taxable investment portfolio could be sold, re-wrapped into an ISA and kept within Capital Gains Tax allowances.
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Home Bias vs Global Equity Calculator (UK)
Compare UK-biased investing with global stock investing.
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ISA Regular Contributions Calculator (UK)
Estimate how regular monthly investing into a Stocks and Shares ISA could build up over the rest of the year.
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ISA Millionaire Timeline Calculator (UK)
See how long it could take to reach £1 million using a Stocks and Shares ISA.
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How Can I Make a Million Pounds Calculator (UK)
See how you might build a £1 million portfolio using different investment strategies.
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GIA vs ISA vs Pension Comparison Calculator (UK)
Compare three common UK investment wrappers using the same annual saving habit.
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Pension vs ISA Comparison Calculator (UK)
Compare the long-term outcomes of investing through a pension versus an ISA.
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Cash vs Investing Opportunity Cost Calculator (UK)
Understand the long-term cost of holding money in cash instead of investing it.
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Lump Sum Investment Calculator (UK)
Decide how to allocate a large one-off sum of money across UK investment vehicles in the most tax-efficient way.
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Cash ISA vs Stocks & Shares ISA Calculator
Compare the long-term growth potential of saving in a Cash ISA versus investing in a Stocks and Shares ISA.
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Property Leverage Calculator
Model how sensible leverage could help you buy more properties and grow your portfolio.
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Lumpy Returns Calculator (UK Specific)
Understand how real-world, non-linear investment returns affect the growth of your pension, ISA, GIA and Buy to Let equity.
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Compound Interest Comparison Calculator (UK)
See how your savings could grow over time under different combinations of time horizon and growth rate.
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ETF vs Managed Portfolio Fees Calculator
Compare a low-cost global index fund with a typical managed portfolio charging 1–2% a year, and see how fees compound over time.
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Overpaying the Mortgage vs Investing
Compare overpaying your mortgage with investing spare cash in an ISA or pension, and see which builds more wealth by retirement.