Free investing tools
The interactive tools from the Hyperion Entities lessons, free for anyone to use. Each one shows the arithmetic behind an idea, with the lessons that explain it. They use simplified assumptions and the numbers you choose, so they're for learning, not forecasting.
Compound interest calculator
See how a starting amount and monthly contributions grow at a steady yearly return, and how much of the ending value comes from growth rather than from the money you put in.
Roth vs. traditional calculator
Compare saving in a Roth account with a traditional one: the same pay set aside, your tax rate now and later, and what you'd have to spend after tax at the end.
401(k) match calculator
Work out how much your employer adds to your 401(k) under its matching formula, and how much match you'd leave unclaimed by contributing less.
DCF calculator
Value a fictional company with a discounted cash flow model: change its free cash flow, growth, and discount rate, and see the value per share, the yearly discounted cash flows, and how much comes from the terminal value.
Bond price and duration calculator
Calculate a bond's price from its coupon, maturity, and yield, see its duration, and find out how much the price moves when interest rates change.
Options payoff calculator
See the profit or loss at expiration of buying or selling a call or put, a covered call, or a protective put, with the break-even, the most that can be gained, and the most that can be lost.
Asset allocation explorer
Choose a mix of US stocks, bonds, and cash and a period since 1928, and see how it would have grown, its worst year, and how often it lost money, using historical returns.