Is there a more accurate way to get mileage? I have to calculate each month from the 10th to the 9th

Let me guide you to get a more accurate way of tracking mileage, jrhys-clitheroe.

We can automatically track mileage in QuickBooks Self-Employed (QBSE), wherein QuickBooks automatically detects and tracks everything from start to finish. Just take your mobile device with you and open the mobile app when you start driving and we'll take care of the rest. Here's how to turn on the automatic mileage tracking feature:

1. Open QuickBooks Self-Employed mobile app. 
2. Select the menu ☰ icon and then Mileage.
3. Select Auto-tracking.
4. Turn on Auto-tracking.

Then, turn on your mobile device's background location permissions for auto-tracking to work. To learn more about this one, see the Set up mileage tracking and vehicles in QuickBooks Online and QuickBooks Self-Employed article. 

Feel free to visit our Help Article page for more insights about managing your business in QuickBooks. 

I'd like to know how you get on after trying the steps, as I want to ensure this is resolved for you. Just reply to this post and I'll get back to you. Have a great day ahead.