Wizard101 Critical Calculator (Crit Chance and Crit Damage vs Block)

1. Enter your critical rating from your stats page and the enemy block rating.
2. Enter your wizard level. Levels above 100 use the same level factor as level 100.
3. Optionally enter a target chance or target multiplier to see the rating you still need.

Here is what each result means:

Critical rating is a stat on your gear that raises the odds of a critical hit. A critical hit makes a spell hit harder than normal.

Before the Fall 2020 update, the stat was a plain percent. Now it is a rating that the game compares with the enemy block rating. Block rating is the defender stat that fights critical hits.

KingsIsle lead designer Ratbeard described the change in an October 2020 dev diary. He said both stats start from a base chance set by level. The game then runs both stats through a limit function that compares the attacker critical with the defender block.

This page covers PvE only. Ravenwood Academy notes that critical works differently in PvP, and the PvP formulas are not on this page.

The game runs two rolls. The first roll tests your critical chance. If it succeeds, a second roll tests the enemy block chance.

1. Find the level factor: level 100 or higher gives l = 1.
2. Compute the first roll: 3 x l x c divided by (3 x c + b).
3. The block chance is what is left: 100% minus the first roll.
4. A critical lands only if the first roll succeeds and the block roll fails. That chance is the first roll times itself.
5. If the critical lands, multiply the hit by 2 minus 3 x b divided by (c + 3 x b).

The developers gave three checks. Equal critical and block gives a 75% first roll and 25% block. Double critical gives 86% and 14% with a x1.40 multiplier. Double block gives 60% and 40% with a x1.14 multiplier. This calculator reproduces all three.

Take a level 100 wizard with 630 critical rating who fights an enemy with 90 block.

Calculation: first roll = 3 x 1 x 630 / (3 x 630 + 90) = 1890 / 1980 = 95.5%. Block chance = 4.5%. A critical lands on 95.5% x 95.5% = 91.1% of hits. The multiplier is 2 - 270 / (630 + 270) = 2 - 0.30 = x1.70.

Averaged over many casts, the blend is 1 + 0.911 x (1.70 - 1) = x1.64 per hit. So this wizard gets about 64 percent extra damage per hit from criticals, not a full double.

The same wizard at level 50 has l = 0.5. The first roll falls to 47.7%, because the level factor caps the chance at 50 percent.

Four inputs move the result, and block rating matters as much as critical rating.

Enemy Block Rating

Each extra point of block lowers both the chance and the multiplier. Ravenwood Academy lists about 90 block for Karamelle mobs and up to 240 for bosses, so one rating can feel very different from fight to fight.

Your Critical Rating

Rating has diminishing returns. Against 90 block, going from 200 to 400 adds 6 points of chance, and going from 800 to 1000 adds less than 1 point.

Wizard Level

The level factor l is level divided by 100 and stops at 1. Below level 100 it caps the first roll at l, so a level 50 wizard cannot pass 50 percent on the first roll.

Buffs and Spells

Ravenwood Academy says Vengeance adds 20 percent to the critical chance for four rounds and Conviction adds 20 percent to the block chance. This calculator does not add those bonuses, so treat them as extra on top.

The first table shows chance and multiplier at level 100 for five ratings against two block values. The block values are examples taken from Ravenwood Academy, which lists them for Karamelle enemies.

The second table flips the question and shows the rating needed for a goal.

These rows are computed with the same formulas as the tool. They are not game data, and they change if the developers retune the formulas.

Choosing Gear

Compare two gear sets by entering the total critical rating of each against the block of the enemy you fight most.

Setting a Rating Goal

Enter a target chance to see the rating you need. Ravenwood Academy suggests about 570 critical for a 95 percent first roll against 90 block, and this tool shows the same figure.

Weighing Critical Against Damage

Compare the average multiplier per hit with the gain from more damage. A damage stat gives a flat boost every hit, while critical gives a boost on only some hits. The average multiplier works like an expected value.

Checking a Pet Talent Plan

Critical talents raise your rating, so run the new total through the tool. Browse the Wizard101 calculators to plan the talents first.

1. Using the Old Rating Divided by 5 Rule

That rule belongs to the pre-2020 percent system. The current formulas compare critical with block, so a fixed divisor gives the wrong answer.

2. Ignoring the Block Roll

The first roll is not the end. A critical that rolls can still be blocked, so the real chance is the first roll times the chance of no block.

3. Expecting a Double Hit

A landed critical is x2 only when block is 0. Against 90 block with 630 critical it is x1.70, and against 240 block it is x1.47.

4. Using PvE Numbers in PvP

The developers have said PvP uses different critical rules. Do not use this page for duels.

5. Mixing Up Rating and Percent

The stats page may show a rating or a percent depending on the screen. Enter the rating here, never the percent.

The math is exact for the published formulas, but the formulas are community-documented and from late 2020.

If your in-game critical chance differs from this page, change the formula constant under the inputs and compare. Report a mismatch with the contact link below.

Read the general guide to crit chance and damage for the idea behind the math. For the odds of a pet talent instead, use the pet talent chance calculator.

Use 3 x level factor x critical rating divided by (3 x critical rating plus enemy block). For a level 100 wizard with 630 critical against 90 block, that gives 95.5 percent. Enter your numbers above for yours.

Against 90 block you need about 570 at level 100 or higher. Against 240 block you need about 1,520. Enter a target chance in the tool for any other block value.

The maximum is x2, and you only reach it against an enemy with 0 block. KingsIsle stated that a defender with 0 block takes the full x2 on a landed critical.

Block rating lowers it. The multiplier is 2 minus 3 x block divided by (critical plus 3 x block), so more block always means a smaller multiplier even when the critical lands.

No. Critical rating changes only the chance and size of the critical bonus. Your damage stat is a separate boost that applies to every hit.

Yes, below level 100. The level factor is level divided by 100, so a level 50 wizard has a ceiling of 50 percent on the first roll. At level 100 or higher the factor is 1.

No. Ravenwood Academy notes that PvP critical is calculated differently, and this page covers PvE only. Do not use it to plan duel builds.

It varies by boss and world. Ravenwood Academy listed about 90 block for Karamelle mobs and at most 240 for Karamelle bosses in December 2020. Check the enemy you fight, because the tool needs the real value.

The developers can retune the formulas, and temporary bonuses such as Vengeance add on top. The formulas here date from December 2020, so compare with your in-game value and adjust the constant if needed.

Ravenwood Academy says critical heals use the same chance formula against the block of the person healed, and a critical heal cannot be blocked. This calculator is built for damage.

• Critical Changes Explained (Ravenwood Academy, 15 December 2020). Formulas and PvE-only note.
• Crit Block Stat Rebalance dev diary (KingsIsle, 14 October 2020, archived copy because the original page no longer loads). Anchor values: 75/25, 86/14 and 60/40 splits.
• Dev Diary announcement thread (Wizard101 message boards, 14 October 2020). Confirms the diary was published by the developers.