In nowadays, iPhone Calendar plays a more and more important part in our daily life. You can use this software to remember your date, meetings or schedules. If you sync your iPhone Calendar with Google/Gmail, Outlook, iCloud or other program, it will be much easier for you to know or deal with your daily schedules.

However, you may come with a bothering issue, your iPhone Calendar not syncing with Outlook, Google/Gmail, or other devices. In this situation, you may need to find some ways solve such a problem.
Luckily, in this article, we list some methods for you, to help you fix your iPhone Calendar not syncing with some apps or devices. Now just begin reading this article and learn to fix your iPhone Calendar not syncing.
- Part 1: Fix iPhone Calendar Not Syncing with Google/Gmail
- Part 2: Fix iPhone Calendar Not Syncing with Outlook
- Part 3: Fix iPhone Calendar Not Syncing Between Devices
- Part 4: Best Solution to Solve iPhone Calendar Not Syncing with iPhone Transfer
Part 1. Fix iPhone Calendar Not Syncing with Google/Gmail
It is possible to fix iPhone Calendar not syncing with Google or Gmail. When your Google Calendar not syncing with iPhone, you can follow the next steps to set Google Calendar as the default calendar to solve the problem.
Step 1: Enable Calendar on iPhone
First of all, you need to make sure you have enabled Calendar on your iPhone. To do this, you need to go to Settings on your iPhone and then scroll down to choose Calendars, and reminders. Make sure that Calendars is enabled on your device.

Step 2: Check settings of Gmail
Now you need to check fetch settings of Gmail. Here you need to back to Settings and then choose Mail. Next scroll down and find Account > Fetch New Data. At this point, tap on your Gmail account and tap on Fetch. And then you can choose the frequency as you want.

Step 3: Set Gmail Calendar as default calendar
After checking fetch settings of Gmail, you need to go to Settings and then choose Calendar. Here you need to select Sync > All Events. Then go back to Calendar. Tap on Default Calendar, where you can set Gmail calendar as your default calendar.

Part 2. Fix iPhone Calendar Not Syncing with Outlook
Except fixing this problem with Google or Gmail, you can also fix iPhone Calendar not syncing with Outlook. In what follows are the detailed guides you can follow to fix iPhone Calendar not syncing with Outlook.
Step 1: Download Outlook on iPhone
First of all, you need to download Outlook app on your device. And then try to install and use it on your iPhone.
Step 2: Sync iPhone Calendar with iTunes
Now you need to open iTunes on your computer, and at the meantime, you need to connect your iPhone to the computer via a USB cable. Then click on the iPhone device icon in iTunes. Next choose Info > Sync Calendar with Outlook. You also need to tick the box before All Calendars. Don’t forget to click on Apply button to start the process of syncing iPhone calendar with outlook.

Step 3: Set Outlook Calendar as default calendar
Back to your iPhone device, and go to Settings > Calendar. Here you need to select Sync and then choose All Events in Sync page. Then go back to Calendar, where you need to tap on Default Calendar, and choose Outlook Calendar as default.
Step 4: Upgrade your iPhone
Some users suggest upgrade to new iPhone if it is possible. And it really works for many users.
Part 3. Fix iPhone Calendar Not Syncing Between Devices
When you want to fix iPhone Calendar not syncing between devices, here are some suggestion for you. You can follow the next tips to try to fix this problem.
- Make sure Calendar is enabled on both two iOS devices.
- Try to fix this problem by turning Calendar off and then turn is on.
- After try the two tips above, your iPhone Calendar still not syncing between iOS devices, you can turn your iPhone off and then restart it.
- Check your network settings and Wi-Fi to make sure your iOS devices connected to network correctly and steadily.
- Make sure your Calendar settings are correct.
Part 4. Best Solution to Solve iPhone Calendar Not Syncing with iPhone Transfer
Except the three ways to fix your Calendar not syncing with iPhone, you can also use Apeaksoft iPhone Transfer to do solve this problem. iPhone Transfer is the most professional software you can transfer and sync your file in a safe and efficient way.
You can use Apeaksoft iPhone Transfer to sync iPhone Calendar to another iOS device, or to your personal computer. In what follows, we take how to sync Calendar from iOS to iOS as an example. If you want to know more guides or information, you can download this software to try.
Step 1: Download iPhone Transfer
First of all, download Apeaksoft iPhone Transfer from with the download button above. And then you need to install it on your computer. When it is installed, launch it.
Step 2: Connect iPhone devices
Now you need to connect both the two iOS devices with your computer via two USB cables. When your devices are detected, you can see the information of your devices.

Step 3: Select data to sync
At this point, you are allowed to select which file or data you want to sync. Here you need to find Calendar in this software.

Step 4: Sync Calendar between devices
Click on Import/Export button to sync iPhone Calendar to another device. Then choose Export All and in the list you can see Outlook and many different software, as well as your iOS device. Simply choose it and begin to sync.

Don't Miss: How to fix iTunes won't sync
Conclusion
When you want to sync your iPhone Calendar with Google, Outlook, or other devices but failed, you can follow this article to learn the solution. Here we list different ways to help you fix iPhone Calendar not syncing with Outlook, Google, Gmail or other iPhone and Mac. What you need to do is just reading and following. Hope you can gain something useful from this article.