Best Calendar Calculator Free Apps

233+ iOS apps curated and reviewed

4.7 avg rating
20 free apps
Updated May 2026

Looking for free calendar calculator free apps? 20 of our 233+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Top Picks for Calendar Calculator Free

Date and Time Calculator#1

Date and Time Calculator by 山 钟

Editor's Choice
🔧 Utilities
4.7😐(9.1K ratings)
FreeAds
Date and Time Calculator screenshot 1
Date and Time Calculator screenshot 2
Date and Time Calculator screenshot 3

Calculate time durations accurately with this tool, whether it's for financial planning or tracking important events. Get precise day-to-day calculations and plan ahead with ease.

What We Love

  • 💡 Helpful for tracking dates and time
  • 👍 Simple and easy to use
  • 🚀 Accurate calculations
  • 🚀 Useful for various purposes (medication management, work timelines, etc.)

Room to Improve

  • 🐛 Ads are intrusive and difficult to close
  • 🐛 Compatibility issues on iPad
  • 🐛 Bugs with date/time calculations
Time Calculator - Work Hours#2

Time Calculator - Work Hours by Oval Software Oy

Date, Calendar & Salary Clock
Strong Contender
🔧 Utilities
4.7😊(2.4K ratings)
FreeIn-App Purchases
Time Calculator - Work Hours screenshot 1
Time Calculator - Work Hours screenshot 2
Time Calculator - Work Hours screenshot 3
Time Calculator - Work Hours screenshot 4
Time Calculator - Work Hours screenshot 5
Time Calculator - Work Hours screenshot 6

An app designed to streamline work hours calculations, helping users track their time with precision. Simplify your scheduling and stay organized effortlessly with Time Calculator⁺.

What We Love

  • 🚀 Great Time calculator App
  • 👍 Handy and easy to use
  • 👍 Excellent
  • 👍 Awesome

Room to Improve

  • 🐛 Editing
  • 🐛 Not designed for use on more than one device?
  • 💰 Too Expensive

More Calendar Calculator Free apps to explore

4
Date Calendar Calculator
Date Calendar Calculator
Date Calendar Calculator
Calculate Calendar Date & Time
Free

This application helps users perform various date and time calculations, including finding durations between dates, calculating working days, converting between calendars and time zones, and estimating ovulation and pregnancy due dates. Download it today to access a comprehensive set of tools with a simple and intuitive design.

🔧 Utilities
(28)
5
Calendar
Calendar
Calendar
by Apple Distribution International
Free

Stay organized and effortlessly manage your schedule with this calendar application. Easily create separate calendars for different aspects of your life, view events across various accounts in one place, and enjoy synchronization across all your devices. Schedule events, receive notifications, and simplify meeting invitations with this all-in-one calendar tool.

📊 Productivity
(1.5M)
6
DayCount
DayCount
DayCount
Countdown Days Until Or Since
Free
📊 Productivity
(26K)
7
Simple Calendar - SimpleCal
Simple Calendar - SimpleCal
Simple Calendar - SimpleCal
Tasks & ToDo for your schedule
Free

Stay organized and on top of your schedule with a user-friendly calendar app. Easily manage tasks, events, and appointments all in one place. Download now to simplify your life and never miss a beat!

📊 Productivity
(16K)
8
Days + Date + Time Calculator
Days + Date + Time Calculator
Days + Date + Time Calculator
Days Between Two Dates
Free

Calculate the number of days, duration between dates, and time intervals with this versatile application. Easily determine the days, dates, and times between two points - Try it now!

📊 Productivity
(795)
9
Simple Calendar: ToDo Planner
Simple Calendar: ToDo Planner
Simple Calendar: ToDo Planner
Schedule list & day organizer
Free
$6.99 | 100% OFF

Stay organized and efficient with a user-friendly calendar and to-do list application that helps you manage your tasks and schedule effectively. Plan your day, set reminders, and stay on top of your commitments with ease. Download now to simplify your daily routine!

📊 Productivity
(6.4K)
10
Google Calendar: Get Organized
Google Calendar: Get Organized
Google Calendar: Get Organized
Easily plan & schedule
Free

Stay organized and manage your schedule seamlessly with our calendar application. Sync, schedule, and book appointments with ease. Download now and take control of your time!

📊 Productivity
(130K)
11
PocketLife Calendar
PocketLife Calendar
PocketLife Calendar
Calendar Organizer & Reminders
Free

PocketLife Calendar is a versatile calendar organizer that helps you stay organized and never miss an important event. Manage your schedule effectively with ease. Download now for effortless event planning!

📊 Productivity
(41K)
12
My Love - Relationship Counter
My Love - Relationship Counter
My Love - Relationship Counter
by Bjoern Bartels
Free

Track your relationship milestones with My Love - Relationship Counter. Stay updated on special dates and customize with your photo. Don't miss out on celebrating your love!

🌟 Lifestyle
(681K)
13
ClevCalc - Calculator
ClevCalc - Calculator
ClevCalc - Calculator
All-In-One Calculator
Free

A comprehensive all-in-one calculator app with features like scientific calculator, unit converter, currency converter, percentage calculator, and more for everyday use. It provides a wide range of calculation tools from basic arithmetic to complex conversions and financial calculations. Try it out now for convenient and efficient calculations!

📊 Productivity
(12K)
14
TimeTree: Shared Calendar
TimeTree: Shared Calendar
TimeTree: Shared Calendar
Make a Shared Calendar
Free

A versatile shared calendar app with features for families, couples, and work schedules. Easily share calendars, set reminders, sync with other devices, and manage events with chats and to-do lists. Simplify time management and strengthen your connections with TimeTree! Visit the official website for more information: [TimeTree Official Website](https://timetreeapp.com/)

📊 Productivity
(86K)
15
Countdown App
Countdown App
Countdown App
Day Counter: Timer & Widget
Free

Track important dates and events with ease using this handy day counter and timer app. Never miss a deadline or special occasion again - download now to stay organized and prepared.

🔧 Utilities
(17K)
16
Calendar ·
Calendar ·
Calendar ·
Planner Organizer & Agenda
Free

Plan, organize, and manage your schedule effectively with this all-in-one planner and organizer app. Stay on top of your tasks, events, and appointments effortlessly. Download now to boost your productivity!

📊 Productivity
(59K)
17
Teamup Calendar
Teamup Calendar
Teamup Calendar
The Shared Calendar for Groups
Free

Teamup Calendar is a shared calendar application for groups that helps organize people, schedule work, and share events efficiently. It offers multiple sub-calendars, customizable fields, event attachments, and powerful timezone support. Visit https://www.teamup.com to get started and learn more.

💼 Business
(1.5K)
18
Ovulation Calculator Fertile Tracker & Calendar OC
Ovulation Calculator Fertile Tracker & Calendar OC
Ovulation Calculator Fertile Tracker & Calendar OC
by Ovulation Calculator Pty Ltd
Free

Track your menstrual cycle, predict ovulation days, and stay informed about your fertile window with this app. Take control of your reproductive health and plan ahead with ease. Download now to stay on top of your fertility schedule.

🏥 Medical
(5.9K)
19
Calendars: Schedule Planner
Calendars: Schedule Planner
Calendars: Schedule Planner
Reminder・Tasks Organizer・To Do
Free

Plan your day, schedule events, set reminders, and stay organized with this versatile calendar and planner app. Manage tasks, appointments, and to-do lists easily in one place. Download now and take control of your schedule!

📊 Productivity
(120K)
20
Countdown°
Countdown°
Countdown°
Remember your important days!
Free

"Never forget important dates with this top countdown app! Stay organized with event sorting, sharing, custom categories, reminders, date settings, iCloud backup, and more. Download now for iOS and never miss a special day again!"

🔧 Utilities
(24K)