A loan calculator can help you calculate loan payments and costs, which is crucial if you want to make an informed decision before you borrow.

Unlock the full potential of your iPad calculator app with our beginner's guide on how to use math notes on iPad. See how it can automatically calculate math equations and show results as you write.

Select Calculator. Select Calculator one more time. Once in the Per-App Settings menu for Calculator, you'll be able to modify the app visually with settings such as bold text or increased contrast.

Using a simple tool like a sleep cycle calculator can help you pinpoint the optimal time for you to sleep and wake up.