Trading calculators

Deposit growth when profit is reinvested — per day, week or month. A separate mode covers bank deposits with compounding.

How many trades must close in profit at a 70, 80 or 90% payout to at least break even.

How much to put on a trade and what the account looks like after a run of losses. The most basic risk-management calculation.

Step sizes, the amount required and the odds of losing the whole series — with the price of the doubling method in plain numbers.

Lose 30% and you need to earn 43%. Computes the gain required and how long it takes to return the account to its previous level.

A series with its risk known in advance: set the amount for the series, the length and the wins you need — the method sizes the trades itself.

A compensation chase: the size rises gently after a loss and steps back down after a win. The deposit lasts nearly three times longer than in martingale.

Reverse martingale: the size grows only on profit, and a loss returns it to the base. The risk never exceeds what you have already earned.

Sizes follow the Fibonacci numbers. Gentler than martingale, but the growth is still exponential — the calculator shows where it stops being gentle.

The mathematically optimal trade size for your win rate and payout — together with an honest warning about why nobody trades full Kelly.