So, if you've already traded in traditional finance, you've probably heard of PnL. But here in crypto, do things work the same way? Like, what exactly is PnL in the cryptocurrency universe? Let me tell you what I’ve learned about it.

Basically, PnL is the calculation of your profit or loss on a crypto position. Just that simple. We need to understand some key terms: mark-to-market (MTM), realized PnL, and unrealized PnL. Without these clear concepts, trading crypto becomes chaos. I myself took some time to get the hang of it.

MTM is when you evaluate an asset by its current market price. If you have Bitcoin, its value fluctuates as the BTC price changes. It’s like looking at your portfolio now and seeing how much it’s worth at this very moment.

Let’s go to a practical example: if ETH is at $1,970 today and yesterday it was at $1,950, your PnL is $20 profit. Easy. But if yesterday it was at $1,980, then you had a loss of $10. That’s what PnL means — the change in the value of your positions.

Now, when we talk about crypto investing, there are two types of PnL that matter: realized and unrealized. Realized PnL is when you’ve already closed the position, sold the crypto. Then, we calculate the difference between the entry and exit prices. If you bought DOT at $70 and sold at $105, your realized PnL was $35 profit. But if you sold at $55, then it was a $15 loss.

Unrealized PnL is more interesting: it’s the gain or loss you currently have on open positions that you haven’t closed yet. Like, you bought ETH at $1,900 and now it’s at $1,600. You have an unrealized loss of $300. But until you sell, it’s just a number on the screen.

What is investing without knowing how to measure your performance? That’s why there are different methods. FIFO (first in, first out) uses the price of your first purchase. If Bob bought 1 ETH at $1,100 and then at $800, and sold at $1,200, under FIFO, the initial cost is $1,100, so the profit is $100.

There’s also LIFO (last in, first out), which uses the most recent price. In Bob’s example, the cost would be $800, resulting in a $400 profit. Quite different, right?

There’s also the weighted average cost method. Let’s say Alice bought 1 BTC at $1,500 and then 1 BTC at $2,000. The average cost is $1,750. If she sold at $2,400, the profit is $650. This method is very useful when you make multiple purchases.

One thing that helps a lot is regularly monitoring your open and closed positions. When you buy, you open a position. When you sell, you close it. If you bought 10 DOT at $70 and sold at $100, your PnL is $30. Simple. Doing this in an organized way changes everything.

There’s also the year-to-date calculation, which is useful to see how you’ve performed over the whole year. If you had $1,000 in ADA at the start of the year and now have $1,600, your unrealized gain is $600. It gives a nice overview of your performance.

For those trading perpetual contracts, it’s a bit more complex. You need to calculate realized and unrealized PnL separately, then add them together. But the logic remains the same.

In the end, understanding PnL is about knowing whether you’re truly making or losing money. Knowing your cost basis, quantity, trade prices, and portfolio profitability helps you evaluate if your strategy is working. Many people underestimate this, but it’s the difference between operating in the dark and making informed decisions.

There are also tools that help a lot — specialized spreadsheets, automated trading bots. But before using any tool, it’s good to understand the real concept. Only then can you use the tools intelligently.