Jackpot Calculator

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io.github.jiankn/jackpot-calculatorv0.1.0

Estimate US lottery taxes, compare cash and annuity, split pool prizes and calculate jackpot odds.

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calculate_lottery_odds Read-only

Calculate jackpot coverage for distinct combinations in one drawing and optional before-tax expected ticket return.

gamestring, required

ticketsinteger

Different number combinations in the SAME drawing; repeated combinations do not add coverage.

jackpotCashnumber

Optional jackpot cash option in US dollars, required to compute expected ticket return.

Tools (4)

calculate_lottery_odds

Calculate jackpot coverage for distinct combinations in one drawing and optional before-tax expected ticket return.

read-only

Argument	Type	Description
game*	string
tickets	integer	Different number combinations in the SAME drawing; repeated combinations do not add coverage.
jackpotCash	number	Optional jackpot cash option in US dollars, required to compute expected ticket return.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "game"
  ],
  "properties": {
    "game": {
      "enum": [
        "powerball",
        "megaMillions"
      ],
      "type": "string"
    },
    "tickets": {
      "type": "integer",
      "default": 1,
      "maximum": 302575350,
      "minimum": 1,
      "description": "Different number combinations in the SAME drawing; repeated combinations do not add coverage."
    },
    "jackpotCash": {
      "type": "number",
      "maximum": 1000000000000,
      "description": "Optional jackpot cash option in US dollars, required to compute expected ticket return.",
      "exclusiveMinimum": 0
    }
  },
  "additionalProperties": false
}

calculate_lottery_payout

Estimate taxes and withholding on a known lottery cash prize. Input dollars; result integer cents. Bundled 2026 rules.

read-only

Argument	Type	Description
game	string
prize*	number	US dollars, not cents. Maximum $1 trillion.
status	string
locality	string	Only valid with stateCode NY.
stateCode*	string	US residence and ticket-purchase state, two-letter code. Cross-state claims are not modeled.
otherIncome	number	Other annual income in US dollars before the standard deduction.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "prize",
    "stateCode"
  ],
  "properties": {
    "game": {
      "enum": [
        "powerball",
        "megaMillions",
        "custom"
      ],
      "type": "string",
      "default": "custom"
    },
    "prize": {
      "type": "number",
      "maximum": 1000000000000,
      "description": "US dollars, not cents. Maximum $1 trillion.",
      "exclusiveMinimum": 0
    },
    "status": {
      "enum": [
        "single",
        "joint",
        "headOfHousehold"
      ],
      "type": "string",
      "default": "single"
    },
    "locality": {
      "enum": [
        "NYC",
        "YONKERS"
      ],
      "type": "string",
      "description": "Only valid with stateCode NY."
    },
    "stateCode": {
      "enum": [
        "AK",
        "AL",
        "AR",
        "AZ",
        "CA",
        "CO",
        "CT",
        "DC",
        "DE",
        "FL",
        "GA",
        "HI",
        "IA",
        "ID",
        "IL",
        "IN",
        "KS",
        "KY",
        "LA",
        "MA",
        "MD",
        "ME",
        "MI",
        "MN",
        "MO",
        "MS",
        "MT",
        "NC",
        "ND",
        "NE",
        "NH",
        "NJ",
        "NM",
        "NV",
        "NY",
        "OH",
        "OK",
        "OR",
        "PA",
        "RI",
        "SC",
        "SD",
        "TN",
        "TX",
        "UT",
        "VA",
        "VT",
        "WA",
        "WI",
        "WV",
        "WY"
      ],
      "type": "string",
      "description": "US residence and ticket-purchase state, two-letter code. Cross-state claims are not modeled."
    },
    "otherIncome": {
      "type": "number",
      "default": 0,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Other annual income in US dollars before the standard deduction."
    }
  },
  "additionalProperties": false
}

calculate_pool_share

Estimate one equal member’s cash prize, taxes and withholding. Each member is assumed to have the specified tax profile.

read-only

Argument	Type	Description
game	string
prize*	number	Whole ticket cash prize in US dollars.
status	string
members*	integer	Equal owners of one ticket. Result assumes every member has the specified tax profile.
locality	string	Only valid with stateCode NY.
stateCode*	string	US residence and ticket-purchase state, two-letter code. Cross-state claims are not modeled.
otherIncome	number	Other annual income in US dollars before the standard deduction.

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "prize",
    "members",
    "stateCode"
  ],
  "properties": {
    "game": {
      "enum": [
        "powerball",
        "megaMillions",
        "custom"
      ],
      "type": "string",
      "default": "custom"
    },
    "prize": {
      "type": "number",
      "maximum": 1000000000000,
      "description": "Whole ticket cash prize in US dollars.",
      "exclusiveMinimum": 0
    },
    "status": {
      "enum": [
        "single",
        "joint",
        "headOfHousehold"
      ],
      "type": "string",
      "default": "single"
    },
    "members": {
      "type": "integer",
      "maximum": 10000,
      "minimum": 2,
      "description": "Equal owners of one ticket. Result assumes every member has the specified tax profile."
    },
    "locality": {
      "enum": [
        "NYC",
        "YONKERS"
      ],
      "type": "string",
      "description": "Only valid with stateCode NY."
    },
    "stateCode": {
      "enum": [
        "AK",
        "AL",
        "AR",
        "AZ",
        "CA",
        "CO",
        "CT",
        "DC",
        "DE",
        "FL",
        "GA",
        "HI",
        "IA",
        "ID",
        "IL",
        "IN",
        "KS",
        "KY",
        "LA",
        "MA",
        "MD",
        "ME",
        "MI",
        "MN",
        "MO",
        "MS",
        "MT",
        "NC",
        "ND",
        "NE",
        "NH",
        "NJ",
        "NM",
        "NV",
        "NY",
        "OH",
        "OK",
        "OR",
        "PA",
        "RI",
        "SC",
        "SD",
        "TN",
        "TX",
        "UT",
        "VA",
        "VT",
        "WA",
        "WI",
        "WV",
        "WY"
      ],
      "type": "string",
      "description": "US residence and ticket-purchase state, two-letter code. Cross-state claims are not modeled."
    },
    "otherIncome": {
      "type": "number",
      "default": 0,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Other annual income in US dollars before the standard deduction."
    }
  },
  "additionalProperties": false
}

compare_lump_sum_annuity

Compare a published cash option with 30 growing annuity payments after taxes, including present value and break-even rate.

read-only

Argument	Type	Description
game	string
status	string
jackpot*	number	Advertised annuity total in US dollars.
winners	integer	Number of jackpot-winning tickets sharing the prize.
locality	string	Only valid with stateCode NY.
cashValue*	number	Published cash option in US dollars; do not infer it from a fixed ratio.
stateCode*	string	US residence and ticket-purchase state, two-letter code. Cross-state claims are not modeled.
otherIncome	number	Other annual income in US dollars before the standard deduction.
discountRate	number

{ "type": "object", "$schema": "https://json-schema.org/draft/2020-12/schema", "required": [ "jackpot", "cashValue", "stateCode" ], "properties": { "game": { "enum": [ "powerball", "megaMillions", "custom" ], "type": "string", "default": "custom" }, "status": { "enum": [ "single", "joint", "headOfHousehold" ], "type": "string", "default": "single" }, "jackpot": { "type": "number", "maximum": 1000000000000, "description": "Advertised annuity total in US dollars.", "exclusiveMinimum": 0 }, "winners": { "type": "integer", "default": 1, "maximum": 10000, "minimum": 1, "description": "Number of jackpot-winning tickets sharing the prize." }, "locality": { "enum": [ "NYC", "YONKERS" ], "type": "string", "description": "Only valid with stateCode NY." }, "cashValue": { "type": "number", "maximum": 1000000000000, "description": "Published cash option in US dollars; do not infer it from a fixed ratio.", "exclusiveMinimum": 0 }, "stateCode": { "enum": [ "AK", "AL", "AR", "AZ", "CA", "CO", "CT", "DC", "DE", "FL", "GA", "HI", "IA", "ID", "IL", "IN", "KS", "KY", "LA", "MA", "MD", "ME", "MI", "MN", "MO", "MS", "MT", "NC", "ND", "NE", "NH", "NJ", "NM", "NV", "NY", "OH", "OK", "OR", "PA", "RI", "SC", "SD", "TN", "TX", "UT", "VA", "VT", "WA", "WI", "WV", "WY" ], "type": "string", "description": "US residence and ticket-purchase state, two-letter code. Cross-state claims are not modeled." }, "otherIncome": { "type": "number", "default": 0, "maximum": 1000000000000, "minimum": 0, "description": "Other annual income in US dollars before the standard deduction." }, "discountRate": { "type": "number", "default": 0.04, "maximum": 1, "minimum": 0, "description": "Annual discount rate as a fraction, e.g. 0.04 for 4%." }, "sharePercent": { "type": "number", "default": 100, "maximum": 100, "description": "Your percentage of one winning ticket.", "exclusiveMinimum": 0 } }, "additionalProperties": false }