Five calculators. No signup, nothing stored.
The arithmetic that decides whether a trade is survivable, in a form you can use before the open. Every one runs in your browser — there is no server call on any of these pages, so nothing you type is transmitted or logged.
Position size Account size, stop distance and risk percent in. Share count out. Risk per trade What one percent of your account actually is, in dollars, per trade and per day. R-multiple Turn an entry, stop and exit into an R number so trades of different sizes compare. Break-even The win rate a given reward-to-risk ratio needs before it makes money. Average down What adding to a losing position does to your average price and your total risk.
This is arithmetic, not advice. The calculator applies a standard, publicly known formula to
numbers you type in. It does not know your circumstances, does not judge whether a trade is a good
idea, and nothing you enter is stored or sent anywhere — it runs entirely in your browser.
Educational purposes only. Not investment advice.
Take them with you
We'll email you the calculators plus three short notes on what they do and don't tell you. Then the daily briefing at 9:20am ET — what moved before the open, and whether it's worth your account.
Free, no card. Unsubscribe in one click. You'll get a confirmation email first.
Why these five
They answer the questions that actually come up
Not because they are clever, but because these are the four or five sums that separate a plan from a guess — and because working them out by hand at 8:50am is how mistakes get made.
Size before convictionHow many shares is a function of where the stop goes, not how good the idea feels.
Know the streak costWhat ten losses in a row does to the account, before you are in one.
Compare trades honestlyR makes a small trade and a large one measurable against each other.
See the real break-evenThe win rate a ratio needs before it makes money, costs included.