diff --git a/src/NetscriptFunctions/Formulas.ts b/src/NetscriptFunctions/Formulas.ts
index dbfdba566..c344aa0bb 100644
--- a/src/NetscriptFunctions/Formulas.ts
+++ b/src/NetscriptFunctions/Formulas.ts
@@ -37,6 +37,10 @@ import {
   calculateAscensionMult,
   calculateAscensionPointsGain,
 } from "../Gang/formulas/formulas";
+import {
+  favorToRep as calculateFavorToRep,
+  repToFavor as calculateRepToFavor,
+} from "../Faction/formulas/favor";
 
 export function NetscriptFormulas(player: IPlayer, workerScript: WorkerScript, helper: INetscriptHelper): IFormulas {
   const checkFormulasAccess = function (func: string): void {
@@ -45,6 +49,18 @@ export function NetscriptFormulas(player: IPlayer, workerScript: WorkerScript, h
     }
   };
   return {
+   factions: {
+      calculateFavorToRep: function (_favor: unknown): number {
+        const favor = helper.number("calculateFavorToRep", "favor", _favor);
+        checkFormulasAccess("factions.calculateFavorToRep");
+        return calculateFavorToRep(favor);
+      },
+      calculateRepToFavor: function (_rep: unknown): number {
+        const rep = helper.number("calculateRepToFavor", "rep", _rep);
+        checkFormulasAccess("factions.calculateRepToFavor");
+        return calculateRepToFavor(rep);
+      },
+    },
     skills: {
       calculateSkill: function (_exp: unknown, _mult: unknown = 1): number {
         const exp = helper.number("calculateSkill", "exp", _exp);
diff --git a/src/ScriptEditor/NetscriptDefinitions.d.ts b/src/ScriptEditor/NetscriptDefinitions.d.ts
index 5e102ef1b..6cae8d001 100644
--- a/src/ScriptEditor/NetscriptDefinitions.d.ts
+++ b/src/ScriptEditor/NetscriptDefinitions.d.ts
@@ -3797,6 +3797,26 @@ interface SkillsFormulas {
   calculateExp(skill: number, skillMult?: number): number;
 }
 
+/**
+ * Factions formulas
+ * @public
+ */
+ interface FactionsFormulas {
+  /**
+   * Calculate the total required amount of faction reputation to reach a target favor.
+   * @param favor - target faction favor.
+   * @returns The calculated faction reputation required.
+   */
+   calculateFavorToRep(favor: number): number;
+  /**
+   * Calculate the resulting faction favor of a total amount of reputation.
+   * (Faction favor is gained whenever you install an Augmentation.)
+   * @param rep - amount of reputation.
+   * @returns The calculated faction favor.
+   */
+   calculateRepToFavor(rep: number): number;
+}
+
 /**
  * Hacking formulas
  * @public
@@ -4039,6 +4059,8 @@ interface GangFormulas {
  * @public
  */
 export interface Formulas {
+  /** Factions formulas */
+  factions: FactionsFormulas;
   /** Skills formulas */
   skills: SkillsFormulas;
   /** Hacking formulas */