Tools

Interactive calculators that let you explore the relationships yourself. Everything runs right in your browser.

How regular contributions grow into wealth over decades.

What your money will be worth in 10, 20 or 30 years.

Why −50% needs +100% to recover.

What a 1% annual fee really costs over 30 years.

How many stocks does it take to reduce risk?

Why bond prices fall when rates rise.

Estimate the fair value of a business yourself.

Buy and sell yourself – and watch the price form.

Profit and loss of option strategies at a glance.

How leverage multiplies gains and losses.

How much you can risk per position.

Mix two assets and lower risk – Markowitz you can touch.

How widely a year's possible price paths fan out.

Open, high, low, close – and what a candle tells you.

Price, delta, gamma, theta and vega live with Black-Scholes.

Will your money last? 600 random market paths give the answer.

Why a savings plan buys cheaply when prices swing.