diff --git a/src/familiar/freeFightFamiliar.ts b/src/familiar/freeFightFamiliar.ts
index 18c84e5b5..9a96da43a 100644
--- a/src/familiar/freeFightFamiliar.ts
+++ b/src/familiar/freeFightFamiliar.ts
@@ -1,11 +1,9 @@
-import { Familiar, familiarWeight, inebrietyLimit, Location, myInebriety } from "kolmafia";
+import { Familiar, familiarWeight, inebrietyLimit, Location, Monster, myInebriety } from "kolmafia";
 import {
   $familiar,
   $item,
   $location,
-  $monsters,
   $phylum,
-  $skill,
   clamp,
   findLeprechaunMultiplier,
   get,
@@ -19,6 +17,7 @@ import getDropFamiliars from "./dropFamiliars";
 import getExperienceFamiliars from "./experienceFamiliars";
 import { GeneralFamiliar, timeToMeatify } from "./lib";
 import { meatFamiliar } from "./meatFamiliar";
+import { barfEncounterRate } from "../lib";
 
 type MenuOptions = {
   canChooseMacro?: boolean;
@@ -86,33 +85,12 @@ export function menu(options: MenuOptions = {}): GeneralFamiliar[] {
       Snapper.have() &&
       Snapper.getTrackedPhylum() === $phylum`dude`
     ) {
-      /*
-      # E stands for olfacted Garbage Tourist, A is angry toursit, F is horrible tourist family
-      import itertools
-      def rate(q):
-        m = ["E"] * 5 + ["A"] * 2 + ["F"] * 2
-        options = list(itertools.product(m, m))
-        dude = [m for m in options if (m[0] in ["A", "F"] and m[0] not in q) or (m[1] in ["A", "F"] and m[0] in q and m[0] != "E")]
-        return len(dude) / 81
-      */
-
-      const dudes = $monsters`angry tourist, horrible tourist family`.filter((m) =>
-        $location`Barf Mountain`.combatQueue.includes(`${m}`),
-      ).length;
-
-      // if you don't have olfaction, just assume a simple rate calculation
-      const noOlfactRate = 4 / (1 + 4 + (have($skill`Gallapagosian Mating Call`) ? 1 : 0));
-
-      // when you have olfaction, you
-      // using the above python script, dude rate for number of dudes in queue is:
-      const olfactRate =
-        [
-          0.44, // 0 dudes = 44% chance
-          0.32, // 1 dude = 32% chance
-          0.19, // 2 dudes = 19% chance
-        ][dudes] ?? 0;
-
-      const dudeRate = have($skill`Transcendent Olfaction`) ? olfactRate : noOlfactRate;
+      const encounterRate = barfEncounterRate({ snapper: true, snapperPhylum: $phylum`dude` });
+      const dudeRate = [...encounterRate.entries()].reduce(
+        (acc: number, entry: [Monster, number]) =>
+          entry[0].phylum === $phylum`dude` ? entry[1] + acc : acc,
+        0,
+      );
 
       familiarMenu.push({
         familiar: $familiar`Red-Nosed Snapper`,
diff --git a/src/lib.ts b/src/lib.ts
index ae2a275f6..e588bc458 100644
--- a/src/lib.ts
+++ b/src/lib.ts
@@ -34,6 +34,7 @@ import {
   mySoulsauce,
   myTurncount,
   numericModifier,
+  Phylum,
   print,
   printHtml,
   restoreHp,
@@ -60,6 +61,8 @@ import {
   $item,
   $location,
   $monster,
+  $monsters,
+  $phylum,
   $skill,
   $slot,
   ActionSource,
@@ -80,6 +83,7 @@ import {
   PropertiesManager,
   property,
   set,
+  Snapper,
   SongBoom,
   sum,
   uneffect,
@@ -683,3 +687,80 @@ export function printEventLog(): void {
     );
   }
 }
+
+const rateCache = new Map<string, Map<Monster, number>>();
+
+export function barfEncounterRate(options: {
+  snapper?: boolean;
+  snapperPhylum?: Phylum;
+  olfact?: Monster;
+  longCon?: Monster;
+  motif?: Monster;
+  turtle?: Monster;
+  monkeyPoint?: Monster;
+  humanity?: boolean;
+}): Map<Monster, number> {
+  const olfact = options.olfact ?? get("olfactedMonster");
+  const longCon = options.longCon ?? get("longConMonster");
+  const motif = options.motif ?? get("motifMonster");
+  const turtle = options.turtle ?? get("_gallapagosMonster");
+  const monkeyPoint = options.monkeyPoint ?? get("monkeyPointMonster");
+  const snapper = options.snapper ?? myFamiliar() === $familiar`Red-Nosed Snapper`;
+  const snapperPhylum = options.snapperPhylum ?? Snapper.getTrackedPhylum();
+  const humanity = options.humanity ?? have($effect`Ew, The Humanity`);
+
+  const zoneMonsters = $monsters`garbage tourist, angry tourist, horrible tourist family`;
+  const encounterQueue = zoneMonsters.filter((m) =>
+    $location`Barf Mountain`.combatQueue.includes(`${m}`),
+  );
+
+  const cacheKey = [
+    olfact,
+    longCon,
+    motif,
+    turtle,
+    monkeyPoint,
+    snapper,
+    snapperPhylum,
+    humanity,
+    ...encounterQueue,
+  ]
+    .map((v) => `${v}`)
+    .join(":");
+
+  const cachedValue = rateCache.get(cacheKey);
+  if (cachedValue) {
+    return cachedValue;
+  }
+
+  const copies = (target: Monster | null, n: number): Monster[] =>
+    n === 0 ? [] : [...zoneMonsters.filter((m) => m === target), ...copies(target, n - 1)];
+
+  const monsterQueue = [
+    ...zoneMonsters,
+    ...copies(olfact, 3),
+    ...copies(longCon, 3),
+    ...copies(motif, 2),
+    ...copies(turtle, 1),
+    ...copies(monkeyPoint, 2),
+    ...zoneMonsters
+      .filter((m) => snapper && m.phylum === snapperPhylum)
+      .flatMap((m) => copies(m, 2)),
+    ...zoneMonsters
+      .filter((m) => humanity && m.phylum === $phylum`dude`)
+      .flatMap((m) => copies(m, 2)),
+  ];
+
+  const encounters = monsterQueue.flatMap((m) =>
+    monsterQueue.map((n) =>
+      // olfaction, longcon, and motif caus that monster to ignore queue rejection
+      olfact === m || longCon === m || motif === m || !encounterQueue.includes(m) ? m : n,
+    ),
+  );
+
+  const encounterRate = new Map<Monster, number>(
+    zoneMonsters.map((m) => [m, encounters.filter((n) => n === m).length / encounters.length]),
+  );
+  rateCache.set(cacheKey, encounterRate);
+  return encounterRate;
+}