The % Command

Command Summary

Short for dividing by 100.

Command Syntax


Menu Location

This command can only be accessed through a hex editor (its hex code is 0xBB 0xDA)

Calculator Compatibility

TI-83/84+/SE, OS v1.15+

Token Size

2 bytes

The % symbol is an undocumented command on the TI-83 series calculators starting with OS version 1.15. It's useful as a shortcut for percents - it divides by 100, so it will convert numbers to percentages. For example, 50% will become 50/100 or 1/2, which is just what 50% should be.

Although this trick can save you a few bytes, it also makes your program incompatible with old OS versions — it's up to you to decide if the tradeoff is worth it.

The % symbol is not quite equivalent to the value 0.01: typing in % by itself will give you a syntax error, as expected.

Entering the % symbol

There are several assembly programs out there that can let you access the % symbol if you know what you're doing, but here is a short, self-contained way. First, create an assembly program by entering the following into the program editor:


Then compile it: for example, if you entered the above into prgmX, and prgmY is free, then you can run


Then run the compiled assembly program:


Now the compiled assembly program will become unlocked and contain the characters:


Most of this is garbage data and can be deleted, and the final character is the % character we wanted. (If you delete the other characters, then the % symbol can be accessed at any time by pressing [2nd][RCL] and choosing prgmY.)

Error Conditions

  • ERR:INVALID is thrown on older operating system versions.

Related Commands


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