diff --git a/src/Bladeburner/Skill.ts b/src/Bladeburner/Skill.ts
index 6f0e92347..56398ab96 100644
--- a/src/Bladeburner/Skill.ts
+++ b/src/Bladeburner/Skill.ts
@@ -134,12 +134,24 @@ export class Skill {
   }
 
   calculateCost(currentLevel: number, count = 1): number {
-    //unFloored is roughly equivalent to
-    //(this.baseCost + currentLevel * this.costInc) * BitNodeMultipliers.BladeburnerSkillCost
-    //being repeated for increasing currentLevel
-    const preMult = (count + 1) * (2 * this.baseCost + this.costInc * (2 * currentLevel + count)) / 2;
-    const unFloored = (preMult * BitNodeMultipliers.BladeburnerSkillCost) - count / 2;
-    return Math.floor(unFloored);
+    if (count == 1) {
+      return Math.floor((this.baseCost + currentLevel * this.costInc) * BitNodeMultipliers.BladeburnerSkillCost);
+    }
+    else if (count < 0 || isNaN(count)) {
+      throw new Error(`Attempted to find cost of ${count} BB upgrades`);
+    }
+    else if (count < 100) {
+      const thisUpgrade = Math.floor((this.baseCost + currentLevel * this.costInc) * BitNodeMultipliers.BladeburnerSkillCost);
+      return this.calculateCost(currentLevel + 1, count - 1) + thisUpgrade;
+    }
+    else {
+      //unFloored is roughly equivalent to
+      //(this.baseCost + currentLevel * this.costInc) * BitNodeMultipliers.BladeburnerSkillCost
+      //being repeated for increasing currentLevel
+      const preMult = (count + 1) * ((2 * this.baseCost) + this.costInc * (2 * currentLevel + count)) / 2;
+      const unFloored = (preMult * BitNodeMultipliers.BladeburnerSkillCost) - count / 2;
+      return Math.floor(unFloored);
+    }
   }
 
   getMultiplier(name: string): number {