The numbers behind
every trade you take.

Seven calculators that show you what your edge really is, and what it isn't. No charts. No hopium. Just the math your account lives or dies by.

free for traders · built by a trader

Losing Streak Probability

The brutal streaks your win rate guarantees, by week, month and year.

Profitability & Expectancy

Whether your system actually prints, after fees eat both sides.

Breakeven Win Rate

The exact win rate your R:R needs. The line between losing and winning.

free, no email

Position Size

Risk a fixed slice, never a feeling. The most important pre-trade number.

free, no email

Risk of Ruin

The odds a losing run ends your account before your edge plays out.

R-Multiple & Expectancy Tracker

Paste your results in R. See your true expectancy per trade.

Prop Firm — Worth It?

Configure any challenge. Find out if buying it is +EV for your style.

Built by the same brain

These numbers are step one. Temper is step two.

The math tells you what to do. Temper is my trading psychology app that catches you breaking your own rules in the moment, before the damage is done.

Meet Temper