CS2 Case Expected Value & Opening Simulator Guide (2026)
September 16, 2026
Skin and container prices move all the time. The EV formulas below stay the same. The numbers do not. Recheck live prices in the Opening Simulator before you buy containers or keys.
Why container EV matters
If you have used the Trade-Up Calculator, you already think in inputs, outcomes, and expected value. Cases and capsules use the same idea with a different contract. You pay for one open. You can get many different skins or stickers. The odds are fixed. Each outcome has a live market price.
A lot of short posts ask which case is best to open. That answer goes stale as soon as case or content prices move. What stays useful is a table that recalculates cost, expected value (EV), profit, and ROI from current listings. That is what CSDelta’s Opening Simulator is for.
This guide covers how those columns are defined, how to pick a price source, and how optional simulation sits next to the math. The tool does not open containers on Steam or spend keys.
What EV, cost, and ROI mean
Expected value (EV) is the probability-weighted average of the container’s outcomes at the prices for your selected marketplace. Rarity and wear odds are included. Think of it as the long-run average across many opens, not the result of one open.
Total cost is the container price plus a key when that container needs one.
Profit is EV minus total cost.
ROI is profit divided by total cost, shown as a percent. Negative ROI is common. Sorting by ROI ranks containers by that live ratio. It does not lock in a future payout.
Profit chance (when shown) is the share of outcomes priced above total cost. A high profit chance with weak ROI usually means lots of small “above cost” hits, while rare high-value outcomes still drive most of the EV.
Getting started
Open the Opening Simulator. Containers load with names, types, and prices. Cost, EV, and ROI fill in as market data finishes hydrating. If columns still look empty, wait a moment.
You do not need an account to compare containers or run optional simulations.
Pick a price source
Use the marketplace control to choose lowest (aggregated floor) or a single venue.
- Lowest is fine for a quick cross-market snapshot.
- A single marketplace is better when you buy and sell in one place and want EV to match that price book.
Changing the source recalculates cost, EV, profit, and ROI. Match the source to how you actually price inventory, the same way you would before trusting a trade-up EV.
Filter and sort
Filter by container type when you only want weapon cases, sticker capsules, or another group.
Sort by:
- ROI for the highest (or least negative) return on cost with current prices
- Expected value for the highest average outcome value
- Profit for EV minus cost in currency
- Price for container cost when you are comparing on a budget
Re-sort after prices move. Yesterday’s order is not a standing recommendation.
Expand a container
Open a row to see rarity groups, drop odds, and the item prices that feed EV. Cases and capsules group differently. Sticker finishes are not the same wear ladder as weapon skins.
You can override individual item prices for what-if checks, like a custom sell target. Derived EV, profit, and ROI update from those edits. Reset to market prices when you are done.
Optional: Simulate
Simulate samples one or more opens from the container’s odds using the same price model as the ROI row.
Use it to see how outcomes are spread around. Do not use a short lucky sample to override the EV column. Expected value does not change because one run went well. Simulation never spends Steam keys or removes a case from inventory.
Practical checks before you buy containers or keys
Keys are part of cost. A cheap case with an expensive key can rank worse on ROI than a pricier case with a cheaper key. Read total cost, not case price alone.
Supply moves the table. Armory rotations, new operations, and sticker capsules can shift container and content prices for days. Recheck EV and ROI before bulk purchases.
EV is not a trade-up substitute. If you want a specific skin ladder, build the contract in the Trade-Up Calculator or browse the Trade-Up Database. The Opening Simulator answers container math. Trade-up tools answer input-to-outcome math.
Related tools
- Opening Simulator for container EV and ROI
- Trade-Up Calculator for contract EV and floats
- Trade-Up Database for live recipe cards
- Sniper for listing search by float and price
- Marketplace comparison for fees across venues
FAQ
What is CS2 case expected value?
The probability-weighted average of outcomes at current prices. It describes average results over many opens, not one open.
What is ROI in the simulator?
(EV minus total cost) divided by total cost. Total cost includes a key when the container requires one.
Is the Opening Simulator free?
Yes. Comparison and optional simulation do not require payment.
Does Simulate open a real case?
No. It only samples outcomes. Steam inventory is unchanged.
Why is ROI often negative?
Container plus key usually costs more than content EV. Positive rows are uncommon and usually temporary.
Can I compare capsules and souvenir packages?
Yes. Filter by type, or leave all containers visible to compare cases, capsules, sticker capsules, autograph capsules, and souvenir packages.
Where should I go next?
Open the Opening Simulator, set your marketplace, sort by ROI or EV, and expand a few top rows. Treat Simulate as optional illustration. Recheck live prices the same way you would before submitting a trade-up.