Free tools
Arithmetic you should never do in your head
Each of these takes a minute and changes how a position looks before you take it. Nothing is stored and nothing is sent anywhere — the calculations run in your browser.
Most used
Position sizer
Capital, risk per trade and stop distance in — quantity out.
CalculatorExpectancy
Hit rate against average win and loss, turned into one number.
CalculatorPayoff builder
Build a spread leg by leg and watch the diagram redraw.
In preparation
Trade journal
A structured record that is short enough to actually keep.