All twenty-one calculators open in a panel over whatever page you are on, so you can size a position without leaving a half-filled trade form. Press Alt+C anywhere, or click Tools in the sidebar. On a phone, the menu's Tools tile opens on the position sizer with every other calculator listed under it.
Docked, or detached
It opens docked beside the sidebar. If that covers something you need to see — the order ticket on the trade form, most often — press Detach in the panel header and it becomes a small window you can drag anywhere by its title bar, or move with the arrow keys once the grip has focus. Drag the bottom-right corner to resize it.
A detached window stays open while you work: clicking into the page behind it does not close it, which is the whole point of detaching. Close it with the ×, or send it back with Dock. Where you put it, and whether it was detached, are remembered on this browser.
It is the same calculators
Nothing is a cut-down version: the panel mounts exactly what the Tools page renders. Full page in the header opens that page on the calculator you already have open, when you want the whole screen.
Handing a number to the trade form
With a trade form on screen, a calculator that works out something the form holds offers a Use in trade form button. It names the number and the field before it writes anything — “125 qty” — and it sets only that field. Everything else stays exactly as you typed it.
Two calculators do this today: the Position Sizer hands over the share, contract or lot count, and the Stop & Target Planner hands over the stop and the 1R target. They pass on what they worked out, never the numbers you typed into them — so opening a calculator can never overwrite an entry price you had already filled in.
Which calculator opens
The panel starts on the Position Sizer, then remembers whichever one you used last on this browser. The picker at the top lists all twenty by group and searches as you type; Enter picks the first match.