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Like me, you’ve probably amassed a sizeable collection of financial calculators to help you plan your investments, savings, and retirement.

And if – again like me – you suffer in silence from scatterbrain syndrome, then those handy little resources will be splattered around your browser like a Jackson Pollock study in bookmarks.

In an attempt to bring order to the chaos and neatly array a damn handy set of investing resources for the Monevator community, I’ve created this handy calculators and tools resource page.

Have I missed out your favourite? Is it truly worthy? Then please tell us about it in the comments section and I’ll add it to the list.

My main selection criteria:

  • Free – Critically important! Though you may have to sign-up with an email.
  • Ease-of-use – Not many financial calculators benefit from Apple quality design aesthetics, but the closer we can get to that ideal the better.
  • Range – I’ve trawled for tools that cover the gamut of investing concerns, from yield curves to life expectancy.
  • UK orientated – Where possible I’ve plumped for UK calculators, because Monevator is primarily a UK site. However, the US is the home of the financial calculator, and I’ve sprinkled in a few Stateside tools where a UK alternative isn’t available.
  • Passive orientated – I advocate passive investing and my choices support that investing strategy.

Accuracy is the other important thing to be mindful of when using a financial calculator, tool, or similar resource.

It’s impossible for me to vouch for the fidelity of any dataset, so using these calculators is your responsibility. Many come courtesy of household names like the Bank of England, Morningstar, and Vanguard, but still… Make sure you check their assumptions, and use any outcomes as a guide only, not a dead cert.

Enough of the qualifiers, on with the tools…

The one-stop shop

Financial calculators 1 – An excellent set of saving, investing, and retirement calculators covering a broad range of scenarios. From Candid Money.

Financial calculators 2  – Same again. Superb tools from Dinky Town.

Financial calculators 3 – The answer to every conceivable financial maths problem you might have. Courtesy of Calculator Soup.


Budget planner – Money Saving Expert’s brilliant poke into the hidden corners of personal expenditure.

The Demotivator – The stark cost of buying tat, as measured in lost income and days of your life.

UK inflation calculator – Who better to ask than the Bank of England?

Future inflation calculator – Watch inflation eat your savings.

Investing – fund research

Trustnet tool box – Good for charting, fund comparison, and portfolio tracking, plus there’s a (patchy) portfolio scanner / X-ray device.

ETF table – Superb ETF finder. Customise until your heart’s content.

Fund screener 1 – Find the fund of your dreams by type, TER, manager…

Fund screener 2 – Enables you to specifically search for tracker funds.

ETF screener – Same again, but for ETFs.

Investment Trust screener – Same again, but for ITs.

Fund quick rank – Amusingly named easy-to-use variant of a fund screener.

ETF quick rank – Same again but for ETFs.

Fund comparison – Spot the difference game for up to five funds. Compare returns, asset allocation, sector breakdown, yadda yadda.

Fund comparison for trackers – Useful index fund comparison tables. This is Hargreaves Lansdown, so doesn’t necessarily offer a whole-of-the-market view. Also see TD Direct’s version (set the drop down on the right to tracker funds).

Fund cost comparison calculator – simple – Pit the initial charges and OCFs of two funds against each other.

Fund cost comparison calculator – sophisticated – Smoke out every last expense that assails you with the True & Fair Campaign’s cost calc.

Effect of expenses on your investment – The classic calculation you get from any financial service provider, but in easy-to-digest graph form.

London Stock Exchange ETF prices – Track prices, NAVs, volumes, and estimate liquidity.

Investment Trust stats – Useful for comparing ITs.

Investing – financial goals

Investment goal calculator – How much in pounds or time you’ll need to invest to reach your targets (click on assumptions to set the level of growth).

University savings planner – It’s US-orientated, but could serve as a rough and ready reckoner for the UK.

Compound interest calculator Monevator’s calculator of dreams, see how the money grows.

Who wants to be millionaire calculatorThe Investor does, and he designed this calculator so he can work out how long it will take him.

Investing – asset allocation

Asset allocation historical returns – Discover how various asset allocations have affected returns (give it a few seconds to load the graph). Also click on the grid icon for a more useful display.

Historical rate of return by asset class – 80 years worth of returns data neatly marshalled into interactive graphs. This is US-orientated but should also prove useful to other developed world investors. Also take a look at Fintelapps’ saving, mortgage and net worth calculators.

Best performers – Check out which asset classes and sub-classes are hot! For all you performance chasers momentum capturers out there.

Risk tolerance questionnaire 1 – About as deep as a Cosmo quiz, but it at least gives you a place to start – just don’t take it too seriously.

Risk tolerance questionnaire 2 – Specifically designed to determine your risk tolerance when saving for university tuition fees. Select option 1 from the landing page.

Investment recovery calculator – How long will it take your portfolio to recover from a crash? A good way to think about risk tolerance.

Asset correlation matrix – Quick and easy snapshot of the invisible strings tying major asset classes together.

Bonds vs Equities – Vanguard Target Retirement funds (US) reveal Vanguard’s take on appropriate bond allocations based upon age. (Click on the age bars and scroll down to see the asset allocations.

Asset allocation calculator – Fun to play with and a friendly introduction to asset allocation ideas. However, these tools should be treated as a vague guide only.

Lazy portfolio backtesting tool – Epic spreadsheet comparing US historical returns for various portfolios. Even has its own Boglehead discussion thread.

Investing – broker research

UK broker comparison tableMonevator’s very own market-leading table to help you choose the right broker / platform / fund supermarket.

International broker comparison table – UK brokers that enable you to invest in foreign equities and ETFs as researched by the unstoppable International Investor.

Investing – portfolio tracking

Portfolio tracker – deep – The sanity preserving alternative to plotting every trade on a spreadsheet.

Portfolio tracker – pretty – Not as deep as the one above but lovely to look at. Choose if you’re shallow (joke).

Investment performance calculator – A quick and dirty reveal of the ugly truth about your returns.

Annualised return calculator – quick – Annualised return, geometric return, CAGR, it’s all the same thing and a sound test of your performance. The excellent Money Chimp presides.

Annualised return calculator – detailed – More sophisticated. It’s a spreadsheet calc that takes into account deposits and withdrawals. Hit the Rate of Return Calculator link to download the spreadsheet.

Investing – market data

UK market data – A deep, deep data mine.

The Shiller PE Ratio – PE 10 for the S&P 500.

UK long-term PE – PE 10 for the FTSE All-Share.

UK PE ratios – Covers the major FTSE indices. Handy for valuing the market.

PE ratios by country – Scroll down to Download Data. From the drop-downs select ‘Equities’, then ‘Ratios – Yield and P/E by Country’, then your date, and Alakazam!

Monevator private investor roundup – Our quarterly data wrap of how the world is turning.

Investing – other

US financial calculators – You lucky Americans. You have the best selection of free investing tools in the world, as diligently collected by the Bogleheads.


UK Government bond yields – Check out the gilt yield curve, plus interest rates on all your fave benchmark bonds.

Yield calculator – Work out the yield-to-maturity and running yield for conventional fixed-coupon bonds.

Bank of England yield curve estimates – The venerable central bank sticks its finger in the air on interest rates and inflation.

Price and yield calculator – You can model your own bond crash doomsday scenarios using this.

Bond prices and yields – For individual UK gilts. From the incomparable Fixed Income Investor.

Gilt HQ – An excellent resource from the UK’s Debt Management Office.


Retirement income calculator – How many pennies you’ll have to rub together when you retire.

More retirement calculators – Highly recommended by expert US retirement blogger, Darrow Kirkpatrick. And here’s links to another three from Darrow.

Retirement Monte Carlo sim 1 – You can retire? Great. How long will your funds last?

Retirement Monte Carlo sim 2 – Same again, in case you didn’t like the first answer.

Contribution increase calculator – How much more you could spend in retirement for a small increase in your pension contributions.

Retirement withdrawal calculator – How much you’ll be able to large it in your dotage, depending on withdrawal rate.

Dynamic withdrawal rate calculator – Adjust your withdrawal rate according to investment performance to avoid running out of money. Superb!

Life expectancy calculator – It predicts I’ll live until 92. How about you?

Longevity calculator – The average life expectancy for you and a significant other. Handy for working out how long your pension funds will need to last.

State Pension forecast – You never know, it may still exist when you retire.

Income drawdown calculator – Don’t spend it all at once!

Retirement income calculator – A fun way to think about how much income you’ll need in retirement.

Annuity rate comparison – From the excellent Money Advice Service.

Early retirement calculator – Calculate the savings rate you need to check out in less than 10 years.


UK income tax calculator – detailed – Wail, gnash, moan, but at least we’re not Greece. Listentotaxman is also very good.

UK income tax calculator – quick – Simpler, if the other one makes you sleepy.

Tax code calculator – Sigh.

Capital gains tax calculator – Snore.


Mortgage rate calculator – Comprehensive suite of mortgage number-crunchers.

Mortgage repayment calculator – How much you’ll save by overpaying, courtesy of Monevator.

Buying or renting: US – Which is best? A nifty New York Times calculator that’s convertible to the UK.

Buying or renting: UK – A very simple UK effort. Probably too simple.

If you discover any broken links then please holler in the comments. Hopefully we can grow this list over time into an indispensible community resource, so do let us know about your own favourite financial calculators and tools.

Take it steady,

The Accumulator

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