Best Free Fasting Calculator Apps

250+ iOS apps curated and reviewed

4.6 avg rating
20 free apps
Updated August 2026

Looking for free free fasting calculator apps? 20 of our 250+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Compare top Free Fasting Calculator Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Fasting CenterFasting CenterFree5.0★ (7)NoNoAug 2026
2Fasting Tracker & Diet AppFasting Tracker & Diet AppFree4.6★ (12K)NoNoAug 2026
3Zero: Fasting & Food TrackerZero: Fasting & Food TrackerFree4.8★ (445K)NoYesAug 2026
4Fastic Weight Loss & FastingFastic Weight Loss & FastingFree4.8★ (246K)NoYesAug 2026
5Simple Fasting CalculatorSimple Fasting CalculatorFreeNoNoMay 2026
6Fasting App: Tracker & TimerFasting App: Tracker & TimerFree4.7★ (5.4K)NoYesAug 2026
7FastEasy: Intermittent FastingFastEasy: Intermittent FastingFree4.6★ (79K)NoYesAug 2026
8Intermittent Fasting Tracker:Intermittent Fasting Tracker:Free4.9★ (50K)NoYesAug 2026

Top Picks for Free Fasting Calculator

Fasting Center#1

Fasting Center by Andrey Titov

Fasting Tracker, Log, Insights
Editor's Choice
💪 Health & Fitness
5.0(7 ratings)
Free
Fasting Center screenshot 1
Fasting Center screenshot 2
Fasting Center screenshot 3
Fasting Center screenshot 4
Fasting Center screenshot 5
Fasting Center screenshot 6

Plan extended fasts with personalized projections. Input your body stats and desired duration to estimate weight change, fat loss, and energy use. This data-driven tool provides a clear starting point for your fasting journey.

Fasting Tracker & Diet App#2

Fasting Tracker & Diet App by Hendrik Folkerts

Simple Fast Timer 16:8 & 5:2
Strong Contender
💪 Health & Fitness
4.6😊(12K ratings)
Free
Fasting Tracker & Diet App screenshot 1
Fasting Tracker & Diet App screenshot 2
Fasting Tracker & Diet App screenshot 3

Easily manage your intermittent fasting schedule with this simple timer. Track your fasting and meal times, explore various fasting methods, and discover trends in your progress. Maintain a healthy lifestyle with a user-friendly interface.

What We Love

  • 🚀 Great app
  • 👍 Simple and easy to use
  • 💡 Helpful for tracking fasting
  • 🚀 Effective for weight loss

Room to Improve

  • 🐛 Cannot edit start/stop times
  • 🐛 Inaccurate fasting history tracking
  • 🐛 Continues running timer after fast ends
Zero: Fasting & Food Tracker#3

Zero: Fasting & Food Tracker by Zero Longevity Science, Inc.

Protein & Calorie Calculator
Worth Considering
💪 Health & Fitness
4.8😊(445K ratings)
FreeIn-App Purchases
#99in Health & Fitness
Zero: Fasting & Food Tracker screenshot 1
Zero: Fasting & Food Tracker screenshot 2
Zero: Fasting & Food Tracker screenshot 3
Zero: Fasting & Food Tracker screenshot 4
Zero: Fasting & Food Tracker screenshot 5
Zero: Fasting & Food Tracker screenshot 6

This app tracks intermittent fasting and nutrition to help users achieve real body composition changes. It integrates fasting, protein intake, meals, hydration, and habits for a holistic approach to weight loss and metabolic health.

What We Love

  • 🚀 Easy to use
  • 📊 Helpful tracking and data
  • 💡 Informative learning resources
  • 🔍 Detailed fasting information

Room to Improve

  • 💰 Expensive premium subscription
  • 🔒 Forced account creation
  • 🙄 Intrusive ads and upsells

More Free Fasting Calculator apps to explore

4
Fastic Weight Loss & Fasting
Fastic Weight Loss & Fasting
Fastic Weight Loss & Fasting
Protein, Tracker, Nutrition
Free

This app guides users through personalized intermittent fasting and nutrition plans to achieve sustainable weight loss. It offers features like a food scanner, progress tracking, and a community for support, helping users burn fat and improve overall health.

Personalized fasting and nutrition plansProtein fasting for muscle maintenanceIntermittent fasting for fat burning
💪 Health & Fitness
(246K)
free with in-app purchases
5
Simple Fasting Calculator
Simple Fasting Calculator
Simple Fasting Calculator
by Bitsational LLC
Free
💪 Health & Fitness
(0)
6
Fasting App: Tracker & Timer
Fasting App: Tracker & Timer
Fasting App: Tracker & Timer
Intermittent Fasting for Body
Free

This app guides users through intermittent fasting for weight loss and improved health. It offers simple tracking, personalized plans, and smart notifications to help establish healthy habits without restrictive diets.

Intermittent fasting guidanceWeight loss without restrictive dietsOMAD and 16/8 timer options
💪 Health & Fitness
(5.4K)
free with in-app purchases
7
FastEasy: Intermittent Fasting
FastEasy: Intermittent Fasting
FastEasy: Intermittent Fasting
Simple Weight Loss & Tracker
Free

This app guides users through intermittent fasting to achieve weight loss and improve health. It offers customizable fasting plans, a timer, water tracking, and personalized recipes. Track your progress and gain insights into your body's changes.

Customizable fasting plansFasting timer and remindersWater intake tracker
💪 Health & Fitness
(79K)
free with in-app purchases
8
Intermittent Fasting Tracker:
Intermittent Fasting Tracker:
Intermittent Fasting Tracker:
Simple 16:8 Fast Timer
Free

This app offers a straightforward and private way to track intermittent fasting. It supports iPhone and Apple Watch, providing essential features like widgets, notifications, and progress charts without any advertisements. Ideal for both beginners and experienced fasters, it focuses on a simple user interface to support health and wellness goals.

Interactive WidgetsNotificationsStreaks & Badges
💪 Health & Fitness
(50K)
free with in-app purchases
9
Intermittent Fasting Tracker®
Intermittent Fasting Tracker®
Intermittent Fasting Tracker®
Fasting Timer, Calorie Tracker
Free
💪 Health & Fitness
(0)
10
Intermittent Fasting Tracker -
Intermittent Fasting Tracker -
Intermittent Fasting Tracker -
Easy Fast Timer, Lose Weight
Free

This app helps users achieve sustainable weight loss and health goals through personalized intermittent fasting plans and an AI-powered calorie counter. It offers features like food scanning, hydration tracking, and detailed progress monitoring. Users can access science-based insights and healthy recipes to support their journey.

Personalized fasting plansAI calorie counter and food loggerWater and hydration tracker
💪 Health & Fitness
(29K)
freemium
11
Fasting 168 | Fasting Tracker
Fasting 168 | Fasting Tracker
Fasting 168 | Fasting Tracker
Simple Weight Loss & Tracker
Free
🔧 Utilities
(0)
12
Daniel Fast Calculator
Daniel Fast Calculator
Daniel Fast Calculator
Fast Timer & Bible Verses
Free
💪 Health & Fitness
(0)
13
Calculator - Calc
Calculator - Calc
Calculator - Calc
Calculator
Free
📚 Education
(0)
14
Fastin: Intermittent Fasting
Fastin: Intermittent Fasting
Fastin: Intermittent Fasting
Simple Weight Loss Tracker App
Free

This app guides you through intermittent fasting for weight loss and improved health. It offers personalized plans, tracking tools for food, weight, water, sleep, and activity, along with educational courses on fasting and nutrition. Visualize your progress with detailed statistics to stay motivated on your journey.

Personalized fasting plansFood, weight, water, sleep, and activity trackingFasting and nutrition courses
💪 Health & Fitness
(10K)
subscription
15
Zazen· Fasting Tracker
Zazen· Fasting Tracker
Zazen· Fasting Tracker
Simple Fasting Tracker
Free
🌟 Lifestyle
(0)
16
Fast-E - Intermittent Fasting
Fast-E - Intermittent Fasting
Fast-E - Intermittent Fasting
Simple Fasting Timer & Tracker
Free
💪 Health & Fitness
(0)
17
Fira: Fasting Timer & Tracker
Fira: Fasting Timer & Tracker
Fira: Fasting Timer & Tracker
Simple, Easy Intermittent Fast
Free
🔍 Reference
(0)
18
FastingNote
FastingNote
FastingNote
A fasting record tool
Free
💪 Health & Fitness
(0)
19
Fast 16: Intermittent Fasting
Fast 16: Intermittent Fasting
Fast 16: Intermittent Fasting
Weight & Fasting Tracker App
Free

This app helps you track your fasting periods with a built-in timer and helpful reminders. It provides detailed statistics on your fasting habits and offers resources to learn about healthy fasting practices.

Fasting timerFasting remindersDetailed fasting statistics
💪 Health & Fitness
(2)
free with in-app purchases
20
BreakFast - My Fasting Tracker
BreakFast - My Fasting Tracker
BreakFast - My Fasting Tracker
Intermittent fasting timer
Free
💪 Health & Fitness
(0)

FAQ about Free Fasting Calculator

What are the best free fasting calculator apps for iPhone?
Fasting Center tops our free fasting calculator apps ranking as of August 2026, with a 5.0-star average from 7 App Store ratings, and it's free to download.
Fasting Center has no ads and has no in-app purchases, according to its App Store listing as of August 2026.
We track 250+ free fasting calculator apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
Fasting Center is a planning and estimation tool designed to help users plan extended fasts. It provides personalized projections of weight change, fat loss, and energy use based on user-inputted stats and desired fast duration.
No, Fasting Center is a planning and estimation tool and does not provide medical advice. Users are strongly advised to consult a healthcare provider before starting any extended fast, especially if they have underlying health conditions.