Compounding Simulator
What a run of trades actually does to an account — simulated over real paths, not projected from an average. Options contracts or penny-stock shares.
What this is, and what it is not
This is arithmetic on numbers you supply. The win rate is an assumption you type in — it is not a measurement SFTi has made, and nothing here reads the live system or predicts any market. It is a position-sizing tool, not a signal and not advice.
It simulates paths rather than averaging them. Most compounding calculators add the expected value of a trade to the balance each step. That is the arithmetic mean, and compounding pays the geometric one — so below a 100% win rate the two diverge, and the gap grows with position size. Both curves are drawn here so the difference is visible.
The single number this whole model turns on — and the one most calculators bake in as a constant.
$0.00 is a total loss. Anything above it is a stop that actually filled — which is usually the difference between an edge and a slow bleed.
Your assumption, not a measurement. Drag it off 100% and watch the gold median separate from the dashed projection.
Broker commission. Charged on BOTH sides. A close before expiry is a second hit.
Exchange and regulatory on the same ticket. Also both sides. The Robinhood ticket was $0.01 commission + $0.01 exchange per contract in, and again on the way out. That is $0.04 round trip, not 1% of premium.