Calculators
Sixteen small calculators that show what numbers do to money over time. Everything runs in your browser, nothing is stored or transmitted.
Emergency fund calculatorWork out how big your safety cushion should be, and how long it would cover you without income.
Compound interest calculatorShows how a starting amount and a monthly contribution grow over time, and how much of the result is your own money versus returns.
Savings-rate comparisonCompares two savings rates over the same period and shows why the rate matters more than chasing returns.
Long-term fee calculatorShows how much an annual fee eats out of your final result over long time frames.
What your broker really costs youEnter your own terms and see what they cost over twenty years. No providers are named or recommended.
Pay down debt or investCompares the guaranteed saving from paying down debt against the uncertain return of investing, after tax.
Tax on your gainsWorks out what's left of a realized gain after tax, under each country's rules.
Position-size calculatorCalculates the maximum position size from your account size, risk per trade, and distance to your stop-loss.Break-even calculatorWorks out how far a price needs to move before a trade, after spread and fees, even reaches break-even.
Leverage and liquidation simulatorShows how far a price can move, at a given leverage, before the position is forcibly closed.
Drawdown calculatorCalculates the gain needed to fully recover from a given loss. The answer surprises most people.
The crash testWatch your portfolio fall and decide for yourself: hold or sell. Afterward, you find out which historical period it was.
Compare two brokers side by sideEnter the terms of two providers and see the costs side by side. No providers are named, none recommended, no commissions collected.
Which allocation fits youDerives a percentage allocation from your time horizon and loss tolerance. Deliberately names no product.
The FOMO testFive short situations show how strongly the fear of missing out is shaping your decisions right now.Portfolio X-RayEnter your positions and instantly see the breakdown by asset class, with a warning for concentration risk.