Free community trading-risk simulator

Position Sizing Lab

A small public trading-risk game: the edge is fixed, but your sizing decides whether you compound, crawl, or blow yourself to bits.

Equity $100,000 Ready

Game setup

System preset Trades per round Starting equity Risk per trade: 2.0%

Educational toy only. It ignores slippage, correlation, changing volatility, liquidity, and all the other goblins that live under real trading desks.

0 / 30trades

–realised win rate

0.0%max drawdown

+0.20Rsystem expectancy

Last trade

None yet

Lesson

Positive expectancy is not permission to bet like a lunatic.

Trade log

What is this?

This is a free educational simulator for position sizing. It uses simplified R-multiple outcomes to show why risk per trade can matter more than being right.

Not financial advice. It is a teaching toy, not a trading system.
No affiliation implied. It is inspired by classic position-sizing education, including Van Tharp-style lessons, but is an original simulator.
No tracking. It runs locally in your browser and stores nothing.