diff --git a/src/app/api/contribution/[username]/route.ts b/src/app/api/contribution/[username]/route.ts
index 83a80fa..8b83924 100644
--- a/src/app/api/contribution/[username]/route.ts
+++ b/src/app/api/contribution/[username]/route.ts
@@ -4,7 +4,7 @@ import { ErrorType } from '~/enums'
 import { getValuableStatistics } from '~/helpers'
 import { mockGraphData } from '~/mock-data'
 import { fetchContributionsCollection, fetchGitHubUser } from '~/services'
-import type { GraphData, ResponseData } from '~/types'
+import type { GraphData, ResponseData, ValuableStatistics } from '~/types'
 
 interface GetContributionRequestParams {
   username: string
@@ -46,9 +46,13 @@ export async function GET(
         contributionCalendars,
       }
 
-      const valuableStatistics = getValuableStatistics(graphData)
+      let valuableStatistics: ValuableStatistics | undefined
 
-      const data = statistics ? { ...graphData, statistics: valuableStatistics } : graphData
+      if (statistics) {
+        valuableStatistics = getValuableStatistics(graphData)
+      }
+
+      const data = valuableStatistics ? { ...graphData, statistics: valuableStatistics } : graphData
 
       return NextResponse.json({ data }, { status: 200 })
     } catch (err) {
diff --git a/src/helpers.ts b/src/helpers.ts
index aec765d..8e590e4 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -1,6 +1,6 @@
 import splitbee from '@splitbee/web'
 
-import type { GraphData } from '~/types'
+import type { GraphData, ValuableStatistics } from '~/types'
 
 export function numberWithCommas(num: number): string {
   return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',')
@@ -167,26 +167,30 @@ export function getWeekendActivity(graphData: GraphData): { total: number; ratio
   }
 }
 
-export function getValuableStatistics(graphData: GraphData) {
+export function getValuableStatistics(graphData: GraphData): ValuableStatistics {
   let weekendContributions = 0
   let totalContributions = 0
 
   let longestStreak = 0
   let currentStreak = 0
-  let longestStreakStartDate: string | null = null
-  let longestStreakEndDate: string | null = null
+  let longestStreakStartDate: string | undefined = undefined
+  let longestStreakEndDate: string | undefined = undefined
 
   let longestGap = 0
   let currentGap = 0
-  let longestGapStartDate: string | null = null
-  let longestGapEndDate: string | null = null
+  let longestGapStartDate: string | undefined = undefined
+  let longestGapEndDate: string | undefined = undefined
 
   let maxContributionsInADay = 0
-  let maxContributionsDate: string | null = null
+  let maxContributionsDate: string | undefined = undefined
+
+  let totalDays = 0
 
   graphData.contributionCalendars.forEach((calendar) => {
     calendar.weeks.forEach((week) => {
       week.days.forEach((day) => {
+        totalDays++
+
         const isWeekend = day.weekday === 0 || day.weekday === 6
 
         if (isWeekend) {
@@ -232,6 +236,8 @@ export function getValuableStatistics(graphData: GraphData) {
     totalContributions += calendar.total
   })
 
+  const averageContributionsPerDay = Math.round(totalContributions / totalDays)
+
   return {
     weekendContributions,
     totalContributions,
@@ -243,5 +249,6 @@ export function getValuableStatistics(graphData: GraphData) {
     longestGapEndDate,
     maxContributionsInADay,
     maxContributionsDate,
+    averageContributionsPerDay,
   }
 }
diff --git a/src/types.ts b/src/types.ts
index a1fc2cc..bc6cedb 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -147,3 +147,17 @@ export interface GitHubIssue {
 export type RepoCreatedInYear = InferInput<typeof ReposCreatedInYearSchema>
 
 export type IssuesInYear = InferInput<typeof IssuesInYearSchema>
+
+export interface ValuableStatistics {
+  weekendContributions: number
+  totalContributions: number
+  longestStreak: number
+  longestStreakStartDate?: string
+  longestStreakEndDate?: string
+  longestGap: number
+  longestGapStartDate?: string
+  longestGapEndDate?: string
+  maxContributionsInADay: number
+  maxContributionsDate?: string
+  averageContributionsPerDay: number
+}