Order Simulator

Direct Answer

This order simulator lets you pick a market, limit, stop, or stop-limit order and see how it would have filled against a randomized price path, with no real money or market data involved. Run it as many times as you like to compare how the same order type behaves when the price path changes.

Try It Yourself

Choose an order type, side, quantity, and price levels, then run the simulation. Each run generates a new randomized price path so you can see how the same order might fill differently depending on where the price goes.

How This Simulation Works

Each run generates a short randomized price path starting from your chosen starting price. The simulator then checks, tick by tick, whether your order's conditions would have been met:

• Market orders fill immediately at the first simulated price.
• Limit orders fill the first time the price reaches your limit or better.
• Stop orders trigger and fill at market once the price reaches your stop level.
• Stop-limit orders trigger at the stop price, then only fill if the price subsequently meets the limit price before the path ends.

This is an educational simulation only. It does not use real market data and does not represent an actual trade.

This simulator models each order type as a clean trigger against a single price path. Real markets add risks this simulation doesn't capture, broker-specific trigger rules, trading halts, and overnight gaps among them. See Stop, Stop-Limit, and Triggered Orders in Real Markets for how those risks play out beyond this simulation.

Methodology

Each run generates a synthetic price path of 20 ticks starting at your entered price. Every subsequent tick adds a random drift drawn uniformly between negative and positive your chosen volatility value, then floors the result at $0.50 and rounds to the cent. This is a bounded random walk, not a model calibrated to any real security's historical volatility, distribution shape, or trend.

Against that path, the order logic checks conditions tick by tick: a market order fills immediately at the first tick's price; a limit order fills the first tick where price is at or better than your limit (buy: price ≤ limit; sell: price ≥ limit), using the more favorable of price or limit as the fill; a stop order triggers and fills at market the first tick the stop condition is met (buy: price ≥ stop; sell: price ≤ stop); a stop-limit order first waits for the stop trigger, then applies the limit condition to the remaining ticks from that point forward. If no tick satisfies the condition, the order is reported unfilled.

Assumptions and limitations

• The price path is a random walk, not real market data. It has no relationship to any actual ticker's volatility, trend, gaps, or liquidity, and each run is independent of the last.
• Fills are assumed complete and instantaneous once a tick meets the order's condition, the simulator does not model partial fills, queue position, order size relative to available liquidity, or exchange/broker-specific trigger rules.
• No overnight gaps, halts, or after-hours behavior are modeled. All 20 ticks represent one continuous simulated session.
• This is an educational simulation only, it does not use real market data, live quotes, or represent an actual trade.

References

• SEC Investor.gov: Types of Orders
• FINRA: Order Types