What this Blooket Calculator does

This tool converts tokens and pack selections into practical numbers players care about: total token cost, chance to pull at least one item of each rarity after N packs, expected number of drops, expected resale return from duplicates, net cost, and packs required to reach target probabilities (50% and 90%). It models pack openings as independent draws using published community drop rates and marketplace resale values.

How to use

1. Enter how many tokens you have (optional; updates how many packs you can afford).
2. Pick the Pack (Space, Safari, Dino, etc.). Pack cost updates automatically.
3. Set the number of packs you plan to open.
4. Toggle Include Resale Value: if you want the calculator to subtract expected resale from duplicates.
5. Click Calculate Results: the page shows total cost, expected resale, net cost, ROI, and per-rarity chances and expected drops.

How it works

• Each pack has fixed costs (tokens per pack), per-rarity drop percentages, and marketplace resale value for duplicates. The calculator treats each pack opening as an independent trial with the same probabilities.
• Chance to get at least one of a rarity after n independent openings is:
  P(at least one) = 1 − (1 − p)ⁿ, where p = dropRate/100. This is the standard “one or more successes in n Bernoulli trials” formula.
• Expected drops of that rarity after n openings = n × p. This gives the average number of that rarity you should expect to receive.
• Packs needed for target chance: to find how many packs n are required to reach a target probability T (for example 90%), solve for n:
  n = ceil( ln(1 − T) / ln(1 − p) ) (T expressed as decimal, e.g. 0.9). This is the inverse of the “at least one” formula.
• Expected resale: the calculator multiplies expected drops of each rarity by that rarity’s resale price and sums them. Net cost = total tokens spent − expected resale. ROI = (expected resale − total cost) / total cost (shown as percentage).

Formulas

• p = dropRate / 100
• Probability (at least one in n) = 1 - (1 - p) ** n
• Expected drops = n * p
• Packs for target T = ceil( log(1 - T) / log(1 - p) )
• TotalCost = packCost * n
• ExpectedResale = sum_over_rarities( expectedDrops_rarity * resaleValue_rarity )
• NetCost = TotalCost - ExpectedResale
• ROI% = ((ExpectedResale - TotalCost) / TotalCost) * 100

Explanations for each parameter

• Available Tokens: total tokens you currently hold; used to compute how many packs you can afford.
• Select Pack: pick the pack you’ll open; each pack has its own cost and drop rate profile.
• Number of Packs: how many packs you plan to open; higher numbers increase the chance to get rare blooks.
• Include Resale Value: toggles whether expected duplicate sellback is counted in the return calculation.
• Total Cost: tokens you spend = pack cost × number of packs.
• Expected Return: average tokens you’ll get back from selling duplicate blooks (an estimate).
• Net Cost: total tokens spent minus expected resale (real world may differ).
• ROI: percent return: positive means expected profit from resale; negative means expected net token loss.
• Chance % for rarity: probability that at least one blook of this rarity will appear in the given number of packs.
• Expected Drops: average number of blooks of that rarity you would receive after opening the chosen number of packs.
• 50% / 90% Packs: how many packs you need to open to reach a 50% or 90% chance of obtaining at least one blook of that rarity.

Sources

• Blooket Wiki – “How to calculate when you might get a blook” and packs/drop concepts.
• Generic chance calculator references (independent event math) used by many gacha calculators.
• Popular community calculators & value guides to confirm ROI/resale approach.
• IBlooket (community calculator examples).