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.
Your Investment Journey
A comprehensive investment strategy involves choosing the right accounts, understanding compound growth, and minimising fees. Use our calculators to build an optimal portfolio.
Compare Investment Accounts
Use the Cash ISA vs Stocks & Shares ISA Calculator to see which better supports your retirement goals and understand the trade-offs between safety and growth.
Understand Compound Growth
Use the Compound Interest Comparison Calculator to see how your investments grow over time and understand the power of compounding.
Minimise Fees
Use the ETF vs Managed Portfolio Fees Calculator to see how fees impact your long-term returns and find the most cost-effective investment approach.
Stress-Test Your Strategy
Use the Safe Withdrawal Rate Stress Tester to see how robust your portfolio is under different market conditions and withdrawal rates.
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
Compare Cash ISAs and Stocks & Shares ISAs to see which better supports your retirement goals. Model growth rates, risk levels and tax efficiency over time.
Lump Sum Investment Calculator
Calculate how a lump sum investment grows over time. Model different investment scenarios, growth rates and time horizons to see the potential returns on a one-time investment.
Compound Interest Comparison Calculator
See how compound interest grows your investments over time. Compare different contribution levels, growth rates and time horizons to understand the power of compounding.
Safe Withdrawal Rate Stress Tester
Test how robust your portfolio is under different market conditions and withdrawal rates. See how sequence risk and market volatility affect your retirement sustainability.
ETF vs Managed Portfolio Fees Calculator
Compare the long-term cost of ETFs versus managed portfolios. See how fees impact your returns and understand the true cost of different investment approaches.
Cash vs Investing Opportunity Cost Calculator
Calculate the opportunity cost of keeping money in cash versus investing it. See how much potential growth you’re missing by holding cash and understand when cash makes sense.
Getting Started with Investment & Portfolio
New to investment planning? Follow this step-by-step guide to start understanding your investment options and building an optimal portfolio.
- Compare investment accounts – Use the Cash ISA vs Stocks & Shares ISA Calculator to see which better supports your retirement goals.
- Understand compound growth – Use the Compound Interest Comparison Calculator to see how your investments grow over time.
- Calculate fee impacts – Use the ETF vs Managed Portfolio Fees Calculator to see how fees affect your long-term returns.
- Model lump sum investments – Use the Lump Sum Investment Calculator to see how one-time investments grow over time.
- Stress-test your strategy – Use the Safe Withdrawal Rate Stress Tester to see how robust your portfolio is under different conditions.
- Refine your strategy – Use other calculators to understand opportunity costs, tax drag, and how investment decisions fit with pensions, ISAs, and your overall retirement plan.
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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Lump Sum Investment Calculator (UK)
What is the Lump Sum Investment Calculator? The Lump Sum Investment Calculator helps you decide how to allocate a large one-off sum of money across UK investment vehicles in the most tax-efficient way. It is designed for situations such as a business sale, inheritance, redundancy payout or other windfall, and…
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Cash ISA vs Stocks & Shares ISA Calculator
 What is the Cash ISA vs Stocks & Shares ISA Calculator? The Cash ISA vs Stocks & Shares ISA Calculator helps you compare the long-term growth potential of saving in a Cash ISA versus investing in a Stocks & Shares ISA. It models contributions, interest rates, investment growth and inflation…
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Property Leverage Calculator
What is the Property Leverage Calculator? The Property Leverage Calculator helps you model how using sensible UK leverage can accelerate your ability to purchase additional properties, grow rental income, and ultimately support earlier or more secure retirement. By combining UK mortgage rates, rental yields, refinancing rules and cautious long-term growth…
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Buy-to-Let Retirement Income Calculator
What is the Buy-to-Let Retirement Income Calculator? The Buy-to-Let Retirement Income Calculator helps you understand how much annual retirement income your rental property or portfolio can realistically provide. By modelling your rents, costs, voids, mortgage payments and tax, you can see what net income your properties will deliver in retirement…
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Semi-Retirement Cashflow Calculator
What is the Semi-Retirement Cashflow Calculator? The Semi-Retirement Cashflow Calculator helps you model your transition from full-time work into a lower-income, more balanced semi-retired lifestyle. It shows how part-time income, investments and pensions can support your spending as you gradually move away from full-time employment. This lets you test when…
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Pension Carry Forward & Annual Allowance Calculator (UK Specific)
 What is the Pension Carry Forward & Annual Allowance Calculator? The Pension Carry Forward & Annual Allowance Calculator helps you understand how much you can contribute to your pension today by combining your annual allowance with any unused allowances from the previous three tax years. It shows your total available…