Investment Calculators
Run the numbers on your investments in seconds — all calculators are free and run right in your browser.
Compound Interest Calculator
See how your regular investments grow thanks to compound interest. Enter your monthly contribution, expected return and time horizon.
Open calculator → 🧮Mortgage Calculator
Calculate your monthly mortgage payment, total interest paid and how the balance falls over time.
Open calculator → 🧮Rental Yield Calculator
Gross and net yield of a buy-to-let property: enter the purchase price, monthly rent and running costs to see the real return.
Open calculator → 🧮Financial Independence (FIRE) Calculator
How much do you need to live off your portfolio? Calculate your target amount with the 4% rule and how long it will take to get there.
Open calculator → 🧮Inflation & Purchasing Power Calculator
What will your money actually buy in ten years? See how inflation quietly eats the value of cash left sitting still.
Open calculator → 🧮Retirement Drawdown Calculator
How long will your portfolio last if you start withdrawing from it? Includes inflation-adjusted withdrawals.
Open calculator → 🧮DCA vs Lump Sum Calculator
Invest it all at once, or spread it over months? Compare both approaches side by side on a rising market.
Open calculator → 🧮Dividend Income Calculator
How much passive income does a dividend portfolio produce — and how does dividend growth compound it over time?
Open calculator → 🧮CAGR (Annualised Return) Calculator
Turn "it went from X to Y in N years" into a single comparable number: the compound annual growth rate.
Open calculator → 🧮Investment Fee Impact Calculator
A 1% fee sounds trivial. See what it actually costs you over an investing lifetime.
Open calculator → 🧮Rule of 72 (Doubling Time) Calculator
How many years until your money doubles? The mental-maths shortcut every investor should know, checked against the exact formula.
Open calculator → 🧮Emergency Fund Calculator
How big should your cash buffer be, and how long will it take to build at your current saving rate?
Open calculator → 🧮Bond Yield Calculator
Current yield and approximate yield to maturity for a bond bought above or below its face value.
Open calculator → 🧮Savings Goal Calculator
Know the target and the date? Work out the monthly contribution that actually gets you there.
Open calculator →