💠 Genshin Artifact Substat Roll Calculator
Score a 5-star artifact with four starting substats, roll tiers, +4 through +20 upgrades, crit value, target hit odds, and expected final rolls.
| Substat | Initial roll | Upgrade rolls | Current value | Useful RV |
|---|
Displayed values follow Genshin's rounded in-game style: flat stats and EM as whole numbers, percent stats to one decimal place.
| Future target hits | Probability | Total target hits | Meaning |
|---|
Odds use a binomial model: future rolls are independent, and each selected target substat contributes one equally likely slot out of four.
| Substat | 70% tier | 80% tier | 90% tier | 100% tier |
|---|---|---|---|---|
| Flat HP | 209.13 | 239.00 | 268.88 | 298.75 |
| Flat ATK | 13.62 | 15.56 | 17.51 | 19.45 |
| Flat DEF | 16.20 | 18.52 | 20.83 | 23.15 |
| HP% / ATK% | 4.08% | 4.66% | 5.25% | 5.83% |
| DEF% | 5.10% | 5.83% | 6.56% | 7.29% |
| Elemental Mastery | 16.32 | 18.65 | 20.98 | 23.31 |
| Energy Recharge% | 4.53% | 5.18% | 5.83% | 6.48% |
| CRIT Rate% | 2.72% | 3.11% | 3.50% | 3.89% |
| CRIT DMG% | 5.44% | 6.22% | 6.99% | 7.77% |
| Level | Four starting substats | Three starting substats | Calculator use |
|---|---|---|---|
| +0 | 4 visible substats | 3 visible substats | Set starting values |
| +4 | 1 random upgrade | Fourth substat appears | First hit roll |
| +8 | 2 total upgrades | 1 random upgrade | Second hit roll |
| +12 | 3 total upgrades | 2 total upgrades | Midpoint audit |
| +16 | 4 total upgrades | 3 total upgrades | Keep or stop check |
| +20 | 5 total upgrades | 4 total upgrades | Final score |
Genshin Impact’s Artifact farming is randomized, but it follows a pattern. Upgrade stuff with materials. Hope for nice stats. It’s all about luck. But that doesn’t mean it should be treated like an exercise in pure chance.
There’s a pattern to its reasons. Knowing the rhyme makes blind hope a matter of calculated risk. And that’s where the calculator comes in (above). Before wasting any more resin, it tells you exactly how likely it is that you’ll hit your goals. That’s the difference between vague optimism and cold, hard data. You need cold data when game gets tough.
How to Use Data to Farm Artifacts
The strategy starts with the four-line artifact, which are a five-star artifact with level zero, four substats, and five rolls remaining. Better than a three-line piece. A three-line piece waste a roll by revealing fourth stat. Over time, having the four-line piece compound into an early advantage. It give more opportunities to stack desired character stats. This knowledge help you decide when to stop pulling and switch sources. High-potential pieces has better rates from strongboxes. It is worth the premium even with increased resin cost.
Next, choose what stats you want to chase. How do you know? You can use the tool to decide that. Go through and mark the substats that matter to you: maybe Elemental Mastery, maybe crit dmg, maybe CRIT Rate. For each new stat you target, there’s a one-in-four chance of getting one of these four initial stats on a new item. Double that number if two of your starting substats is also targets. (That is a fact most player ignore.) Instead of guessing, they hope. That means wasting resin trying to upgrade a piece that didn’t get good early rolls. With binomial probability math, you know when to stop upgrading.
There’s also Crit value. By default, the formula is crit dmg + (CRIT Rate * 2). It result in one number you can easily compare. Something with high crit dmg value may appear impressive, but the lack of a high CRIT Rate can hurt damage output. Fortunately, the calculator will convert that for you. It’ll display the current crit value as well as its potential improvement. That way, you can filter out the noise in your inventory and rely on this score to compare pieces, despite their different than stat spreads.
The tool also includes reference tables. These breakdowns of each tier for rolls have a number value. So there’s a min and a max roll on everything. Tiers run from 70% all the way up to 100%. A max roll on crit dmg is 7.8% and on CRIT Rate is 3.9%. Knowing what these look like help you know how much it varies. And when you see that small change in those numbers, you’ll realize they makes a big difference in an item being good or bad. These benchmarks help you not settle for mediocre.
To farm artifacts take patience and precision. It’s a game of random number generation that is out of your hands. What is in your hands is your reaction to the RNG. When you make decisions based off data, you no longer gamble away your resources. After you plug your substats into the calculator, it does the math for you. You don’t have to guess at probabilities anymre. You still must spend time upgrading items. But now you know which ones is worthy of your time. And that transforms the grind into a strategy.
You should of used this sooner.
