The math behind every trade decision

Risk management is the trade

Most traders don't blow up because their strategy was wrong — they blow up because their sizing was wrong. A setup with a real edge will still ruin an account if every trade risks 8% instead of 1%. The inverse is also true: a modest edge sized correctly compounds into serious results. Sizing is not a nice-to-have at the end of the checklist. It is the checklist.

SellCallPut's risk tools exist to turn that discipline into default behavior. The position sizer ties contract count directly to your account size, your per-trade loss cap, and a Kelly fraction you can tune. The Greeks panel tells you what your book is actually exposed to before you click. The margin calculator checks whether your broker will even let the trade through.

On top of those basics, the breakout filter runs every potential setup against five years of historical analogs — volume confirmation, ATR context, time-of-day filter — and flags whether the pattern is a real continuation or the kind of fake-out that eats small accounts alive.