Valuing a Steam inventory is not complicated once you understand which numbers actually matter, but most people skip steps and end up with a number that is off by a lot.
I went through this properly a few months ago when a friend asked me to help him figure out what his CS2 skins were worth before he decided whether to sell. He had been using the Steam Community Market prices as his baseline, which is a reasonable starting point but nowhere near the full picture. I ended up doing a lot of reading and cross-checking, and the article that pulled everything together most clearly for me was this one on checking steam inventory worth. It covers the whole process in a structured way, including float values, pattern indexes, and why the Steam Market price is often not the real trading price. Worth reading before you do anything else.
Start with the Steam Market, but do not stop there
The Steam Community Market gives you a live price for most items, and that is fine as a rough anchor. The problem is that it reflects what people are listing, not necessarily what things are actually selling for. Volume matters a lot here. A knife with three listings at 400 dollars and no recent sales is very different from a glove with 200 sales in the last week at a stable price. Look at the price history graph, not just the current listing.
For the bulk of an inventory, especially lower-value items, the Steam Market price is close enough. Where it breaks down is with anything that has float-sensitive pricing or rare patterns.
Float values change everything on higher-tier items
A Factory New skin can have a float anywhere from 0.00 to 0.07. A 0.001 float and a 0.069 float are both technically Factory New, but one can be worth several times the other on the open market. The Steam Market does not show float values by default. You only see the wear tier label.
To get the actual float, you need to inspect the item and use a float lookup tool. There are a few browser extensions and dedicated sites that pull this data from the inspect link. The one most people use is well-known enough that I do not need to name it here, but the process is: grab the inspect link from the market listing or your inventory, paste it into the tool, and read the float value directly.
The question of how to actually see the exact float on a Steam Market listing, rather than just on items you already own, comes up a lot. Someone was asking about that here: https://steamcommunity.com/app/730/discussions/0/572666820170099962/ and the thread goes into the specifics of using inspect links on market listings to pull float data before you buy or before you price something you are selling.
Pattern index matters for a short list of skins
Most skins do not have pattern-dependent pricing. A plain blue skin is a plain blue skin. But for items like Case Hardened knives, Marble Fades, and a handful of others, the pattern index determines whether something is worth baseline or a significant premium. A Case Hardened AK with a high blue percentage on the front face can be worth five to ten times a standard one. If you have any of these in your inventory, look up the specific pattern tiers for that skin before you price it. There are community-maintained pattern tier lists that cover the most traded items.
Cross-checking against actual trade prices
Once I have a float and know the pattern situation, I compare against what the marketplaces I use are actually showing for similar listings. I look at:
* What is the lowest active listing for the same wear tier and similar float range
* What recent sales have gone through at what prices
* Whether there is a meaningful gap between the cheapest listing and the next few, which sometimes indicates a mispriced item skewing the average
The Steam Market price and the real-world trading price can diverge noticeably on anything above about 50 dollars. Below that, the difference usually does not matter enough to stress over.
Putting a total on the inventory
For a full inventory valuation, I go item by item on anything worth more than 20 dollars and use Steam Market prices as a quick estimate for everything cheaper. Add it up manually or use one of the inventory value tools that aggregate it for you, keeping in mind those tools pull Steam Market prices and will overestimate on items where real trading prices are lower.
The honest takeaway is that Steam Market price is a ceiling, not a floor. Real trading value is almost always somewhat below it, sometimes significantly so on high-value or float-sensitive items. Get the floats, check the patterns where relevant, and compare against live marketplace data before you commit to any number.