Free tool

What one losing day is allowed to cost

Nothing is uploaded, nothing is stored. The arithmetic runs in this page.

The day's budget $ What you are willing to lose before the day is over. Decide it while you are calm. Losing trades it should survive Three is a common answer. It sets the risk on any one trade. What you trade Only the multiplier changes; the arithmetic is the same. Your stop, in premium How far the option can go against you before you are out. 0.40 means forty cents of premium.

Size one trade can carry

not worked out

It is worked out in this page as you type. If this stays, the page's script did not load.

Losing trades that buys

not worked out

Counted from the size above.

The day is over at

not worked out

Not a suggestion. The number you just set.

01What this number does not know

Commissions. They come off the same budget.
A stop is a price, not a promise. A 0DTE option can gap straight through it, and the loss can be larger than the budget.
An option's stop distance is premium times the multiplier: forty cents on a hundred-multiplier contract is $40 a contract.
Whether the trade is any good. This is arithmetic about a bad day, and says nothing about a win rate.

02Holding yourself to it

The arithmetic was never the hard part. It is 11:40, you are down two, and the number you set this morning is all that stands between a bad day and a bad month. What Interactive Brokers can and cannot do about that.

Degen Pro enforces the number this page produced: the stop cannot be widened, and the broker and the charts close when the budget is spent, until the next morning. That is the paid part.

What it does and what it costs

Also free: what each exit does to your stop; your stops, read from a Tradovate export. Guides by RSS.