ios Calculator: Decimal Points?

There is no option to set the number of decimal places in the current version of Calculator for iOS. Try a third-party app from the App Store such as PCalc. In addition to setting the number of decimal places, you can set the type of rounding. There is also a Accounting display mode which automatically uses two decimal places.

From Welcome to PCalc:

Number of Decimal Places

The maximum number of digits that are displayed after the decimal point for a given number. If there are more digits than can be shown, the value will be rounded to that number of decimal places. This setting applies wherever a value is shown throughout PCalc, including on the tape.

Rounding

This section allows you to choose what type of rounding is used when displaying numbers throughout PCalc. There are various options with examples given, but the default is "Nearest or Even" where numbers are rounded to the nearest value, or in the case where they are equidistant between two numbers, it will round to the even one.

Accounting

Used for displaying currency - it automatically uses two decimal places, with zeros shown automatically after the decimal point. Entering numbers also changes in this mode, with the decimal point added in automatically after two digits. A [00] button also appears instead of the [exp] button.

Hello, psychdrew.

Just to clarify, are you wanting to see a decimal point instead of a comma in some numbers? Typically that is related to the region as to how numbers are formatted. If you need to adjust your location, see this article: Change your Apple ID country or region - Apple Support.

If not, this article gives more information on using iPhone calculator app: Use Calculator on iPhone - Apple Support.

If none of the above information helps with your issue, please explain further what exactly you are trying to do and we can assist more. Thanks and take care.