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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Buy, Borrow, Die Calculator (UK)
What is the Buy / Borrow / Die Calculator? The Buy / Borrow / Die Calculator is an illustrative UK planning tool that compares two ways of funding yearly spending from an investment portfolio. One path models borrowing against investments while allowing the portfolio to continue growing. The other models…
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Home Bias vs Global Equity Calculator (UK)
What is the Home Bias vs Global Equity Calculator? The Home Bias vs Global Equity Calculator helps you compare three simple equity investing approaches: all UK shares, an all global portfolio, and your own UK/global mix. It is designed for UK investors who want to understand how “home bias” can…
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ISA Regular Contributions Calculator (UK)
What is the ISA Regular Contributions Calculator? The ISA Regular Contributions Calculator helps you estimate how regular monthly investing into a Stocks and Shares ISA could build up over the rest of the current tax year. It is designed for people planning ISA top-ups before the 5 April tax-year deadline,…
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ISA Millionaire Timeline Calculator (UK)
What is the ISA Millionaire Timeline Calculator? The ISA Millionaire Timeline Calculator shows how long it could take to build a £1,000,000 portfolio inside a Stocks and Shares ISA. It is built around UK ISA rules and focuses on one simple question: if you invest regularly and earn a steady…
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The Latte Factor Calculator (UK)
What is The Latte Factor Calculator? The Latte Factor Calculator helps you see how a small regular spend could grow if you redirected it into investing instead. It takes a daily amount, turns it into a monthly investment, and projects how it could build over time through compound growth. This…
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Pension Account Growth Calculator (UK)
What is the Pension Account Growth Calculator? The Pension Account Growth Calculator projects how your UK pension pot will grow over time from today until you stop contributing. It models your contributions, employer matching, tax relief, investment returns, and fees to show your projected pot size at retirement. How the…