The 0DTE Playbook
Calculator · Chapter 6

Breakeven calculator

Chapter 6’s cost arithmetic with your own numbers: what a win nets, what a planned loss costs, and the win rate a record has to clear after fees and slippage.

Read this first. The calculator does arithmetic on the numbers you enter; it does not know whether you have an edge. Chapter 6’s own modeling runs the exits against a market that gives them nothing: they win about 67–78% of trades and land about −0.05R to −0.08R a trade after costs. The exits and the sizing control how large the losses are; they do not create an edge.
The credit collected, in quote terms.
50% before 11:00; 35–45% is where most trades close.
The mark stop at three times the credit: a loss of two times the credit.
Fees over the round trip plus entry slippage.
Fees and slippage both ways.
Chapter 6 works 80, 85, and 90.
The book’s example: five.
Sessions that trade.
Chapter 6’s fixed costs: about $60.
—Breakeven win rate after costs
—Net win per spread
—Net loss per spread
—Expectancy per trade, in R
—Expectancy per session
—Per month after subscriptions
Win ratePer sessionPer monthAfter subscriptions

How it is worked

A win nets the credit times the profit target, less its costs. A loss is the mark stop: the spread closed at three times the credit, a loss of two times the credit, plus costs. The breakeven win rate is the net loss divided by the sum of the net win and the net loss. Each SPX contract is 100 times its quoted price.

The defaults are Chapter 6’s example: five vertical spreads, five sessions a month, a $1.50 credit on 10-point wings, a 50% target. A win nets about $0.65 a spread and a loss costs about $3.15, so breakeven is about 83%.

A bound, not a forecast. The breakeven assumes every loss is the full planned loss. Losses closed earlier by the level-based exit or the soft stop are smaller, so the figure is a conservative bar a record has to clear, not an estimate of your result.
The planned loss is not the worst case. On a fast tape a stop fills past its trigger, and in a halt or a gap a defined-risk spread can lose its full width less the credit. Chapter 23 holds each session’s planned losses inside 1–2% of the account for that reason.

Whether a method clears the bar is a question only your own journal can answer. These are illustrations of arithmetic, not a record of anyone’s trading.