Site menu Touch 10i: the scientific calculator for Android
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Touch 10i: the scientific calculator for Android

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Figure 1: Screenshot of horizontal layout - Android

Touch 10i is a basic scientific calculator for Android. It implements most features of the beloved HP-10C, including programming functions. The app uses the same engine of the HP-10C Web emulator. It aims to mimic all features (and limitations) of the real device.

Looking for an iPhone version? Click here to go to Touch RPN.

Get it on Google Play


The calculator mimics the 10C as closely as practically possible, and shares the same limitations.

Touch the upper right corner of the screen to open a quick guide for some operations of the calculator:

Figure 2: Touch 10i - quick guide

Touch the upper left corner to copy the displayed value (the X register) to the clipboard. The value is copied in a "spreadsheet-friendly" format: no thousand separators and point as decimal separator.


Press the ON button to access the Settings panel.

Saving copies of the memory

This is especially useful to have many different programs available and ready to use (perhaps the programs would not fit in the memory all at once, or it is simply inconvenient to have them all in the same memory image). In any case, the whole memory, including all registers and configurations, is saved along with the program.

In Android, the memory operations can be found in the Settings panel.

Vertical layout

By default the layout follows the phone orientation. If you prefer to use a single layout all the time, you can lock it to vertical or horizontal at Settings.

Figure 3: Screenshot of vertical layout

Hardware keyboard

If you have a hardware keyboard (USB or Bluetooth) connected to your phone, you can use some shortcuts to operate the calculator.

A B C !D \E H 7 8 9 /: $#% T I J K P 4 5 6 X* [ ] N Y Z return space 1 2 3 - O F G S R 0 . W +=

Differences from real calculator

First of all, it is important to mention that the calculator engine does not use a ROM dump. It is a clean-room implementation. So the results simply can not guaranteed to be exactly equal. Known deviations:

Terms of use

The calculator is offered "as is". There are no guarantees of precision, exactness, or aplicability to any given purpose. The developer has no responsability for any damages incurring from usage of this software.


Please use the comment section at this page, or contact me by e-mail if you have any issues or feedback.

Privacy policy

The app does not send any user data to any remote party, and it does not share data with other apps.

In Android, when the user saves copies of the memory, they are written as files in the "storage area". Files in this area can be manipulated by any other app installed on the same phone. If this is a problem, remove these files from the SD Card once they fulfill their intended usage.

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