Ever wondered what people mean when they talk about PNL while trading? Let me break this down because it's actually simpler than it sounds.

PNL stands for Profit and Loss—basically your trading thermometer. It tells you exactly how much money you made or lost on a trade. That's it. No magic, just math.

Here's the core concept: PNL is the difference between what you paid for an asset and what you sold it for, minus any fees the exchange charged you. Positive number? You're winning. Negative? Well, that's when the market teaches you a lesson.

The formula is straightforward: (Selling Price - Buying Price) × Amount of asset - Fees

Let me give you a real example. Say you grabbed 0.1 BTC when it was trading at $40,000—that's $4,000 out of your pocket. A few hours later, you sell it at $42,000, which gets you $4,200. Before fees, that's a clean $200 profit. After exchange fees? Probably around $198. That's your realized PNL.

Now here's where it gets interesting. There's a difference between unrealized PNL (when you're still holding the position and it's just floating gains or losses) and realized PNL (when you've actually closed the trade and locked in the profit or loss). Both matter, but realized is what actually hits your wallet.

What's also connected to your PNL? Your position size and leverage. If you're trading with margin or leverage, even small price movements can swing your PNL significantly. That's why people obsess over position sizing—it directly impacts how much you stand to gain or lose.

Think of it like this: you bought coffee for $50 and sold it for $70 an hour later. Your PNL is +$20. If you'd sold it for $40, your PNL would be -$10. On a crypto exchange, it's the exact same concept, except the numbers move faster and there's way more money at stake.

So when you're checking what is pnl in trading, you're really just checking whether your strategy is working or not. It's the scoreboard of your trading performance.