INVESTOR.WTF / FREE TOOLS
Make the numbers
part of the decision.
Calculate what a loss would mean, understand your position size, and write down the reasoning you want to revisit.
How Diversification Reduces Investment Risk
Diversification spreads money across investments so a loss in one holding has a smaller effect on the whole portfolio. It can reduce concentration risk, but it cannot eliminate market risk or guarantee against losses.
Open calculatorInvestment Loss Recovery Calculator
Find the gain needed to return to your starting value after an investment falls. A 50% loss requires a 100% gain to break even.
Open calculatorPortfolio Position Size Calculator
Turn an investment amount into a share of your total portfolio. A $10,000 position in a $100,000 portfolio is a 10% allocation.
Open calculatorPortfolio Loss Calculator
See how a hypothetical loss in one position affects the whole portfolio. A 10% allocation falling 40% reduces the portfolio by 4%, if all other holdings stay flat.
Open calculatorInvestment Thesis Template & Checklist
Put your investment case in writing before making a decision. Use five questions to separate a belief from the evidence that would support or disprove it.
Open templateStart with the question you need to answer
Use loss recovery to understand the gain needed after a decline. Use position size to measure one investment’s share of your portfolio. Use portfolio loss to connect an asset’s downside to the impact on all your money.
The thesis template helps you record a belief, its evidence, and what would change your mind. Combine these tools in the complete decision lab.
All calculations use hypothetical inputs. They do not predict prices, probabilities, or whether you should invest.