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CALC 1 User Guide for TI BAII Plus Users

  1. All of the financial calculations (TVM, Bonds, Cash Flows, Depreciation, Amortization) has separate calculators so the important keys are on the top row.
  2. There are form calculators that have easier input (date pickers, ...) and full tables of results for the amortization and depreciation calculations.
  3. There are separate statistics calculators so the important keys are at the top and more function.
  4. CALC 1 has Key Preview for TVM , STO/RCL and Formula Calculators.
  5. Undo to recover from mistakes.
  6. A List Manager to review and edit the values for statistics and cash flows.
  7. Currency and UOM conversions.
  8. Many Formula Calculators with solving (enter any two values to calculate the third value) and graphing.
  9. A History List to quickly recall past calculations.
  10. Customization without programming.

At the bottom of the page are tables of detailed features.

TVM Calculations

The default "Financial: TVM I/YR" Focused Calculator is similar to the TI BAII except there is no CPT key.

The Auto STO "AS" annunciator will turn on when you have entered a number to let you know that then number will be stored when you tap the N, I/YR, PV, FV keys. Otherwise the value will be calculated. If there is any question, hold the key down and the hint will tell you if you are storing or calculating.

If, for example, you tap the PMT key and the value you just entered is stored as the PMT (you will see the value on the key), just tap it again to calculate the value.

This calculator has P/YR and C/YR (compounding periods). The C/YR is set to the P/YR value when you store it and is not cleared when you tap "clr f". This is similar to the TO BAII behavior.

Selecting 2nd Functions

The CALC 1 equivalent of the "2nd" key is the "shift" key. The STO and RCL keys also give the keys alternate functionality and are usually reserved for storing and recalling values as opposed to computing them. Pressing shift a second time will cancel the shift mode. Cancel STO or RCL by tapping a key without a label.

Note that you can press and hold a key to display a hint for that key. Dragging your finger off of the key will prevent the key function from being executed. If you mistakenly tap a key, CALC 1 has undo support.

Reading the display

Instead of a single line, 7 segment display, CALC 1 has a flexible display that takes advantage of the high resolution iOS retina display. The CALC 1 display area can display 1 to 4 lines of values, key hints, and error messages (not error codes that you need to look up in the manual). The top line of the display shows the name of the current calculator. There are also two mode settings that will be displayed when they are not in the default mode. For the trig degree mode the default is radians so you will only see the mode indicator set when the trig mode is degrees. The time value of money end mode is the default and when in begin mode, the BEGIN status is displayed.

CALC 1 will display a hint when you press and hold a key. So CALC 1 does not need all of the hard wired indicators that a hardware calculator needs.

Setting Formats

Most common options can be set in the Options view. CALC 1 uses standard iOS gestures for common options.

Setting the Number of Decimal Places Displayed

Many calculators will have a "DEC x" key to set the number of decimal places to a value. Otherwise this can be set in the Options view or pinching the display.

Choosing the Angle Units

This can be done in the Options view. Calculators with trigonometric functions will have a "d/r" key to toggle between the default of radians and degrees.

Date Entry

CALC 1 uses the ISO 8601 YYYYMMDD format for entering dates. This is a common date format that most users around the world are familiar with.

For example, April 28, 2004 is entered as 40428. June 4, 2018 is entered as 180604.

Date Entry Shortcuts

If you omit the first two years (the century) of YYYY, CALC 1 will use the current century, 20. This is a common truncated representation.

If you omit the entire YYYY, CALC 1 will use the current year.

Choosing Calculation Methods

CALC 1 supports chain (CHN), algebraic (ALG) and Reverse Polish Notation (RPN) calculation methods.

Resetting Default Values

Each focused calculator has a clear key designed for that calculator.

Clearing Calculator Entries and Memories

The "del" key will delete the last character when entering a number. If the number is entered, it will delete the number as a "CE" key would. If you are entering a number and need to delete the entire number and start over, tap shift clr x.

Since CALC 1 uses a automatic stack, there is a "clr s" key to clear the stack values.

The "clr m" key will clear the user memory. Instead of memories 0-9, CALC 1 uses a-z for memory labels that are easier to remember.

For all of the keys except the last character delete, you can undo the deletion with CALC 1.

Correcting Entry Error

When entering a number, the "del" key will delete the last number.

Shift, clr x will clear the x register in CHN and RPN mode.

Shift Clr f will clear the formula in ALG mode.

Math Operations

CALC 1 has many math functions for each Focused Calculator. See the help page for the calculator.

Memory Operations

Instead of just 10 numeric memory locations, CALC 1 uses alphabetic variables a-z. This gives you more memory values that are easier to remember. CALC 1 also has many variables used by the calculators. Not all user (a-z) variables are available in every calculator. Some calculators will use the top rows for variables specific to that calculator. Also the Key Preview option makes it easier to tell what storage variables are available and

With CALC 1, the automatic stack and history list often make it unnecessary to STO numbers to use later. See Storing and Recalling Numbers for more information.

Storing to Memory

Enter a number (or use the existing value) and tap the STO button. The key labels will be updated to show the available memory variables. Tap the button of the variable you wish to use.

Since storing a value to a variable replaces the old value you can undo the storing of a value if you make a mistake.

See Storing and Recalling Numbers for more information.

Recalling from Memory

Tap the RCL button. The key labels will be updated to show the available memory variables.

Then tap the button with the label of the variable you want to recall.

Memory Arithmetic

CALC 1 has memory arithmetic to add, subtract, multiply and divide to a memory value. See the documentation on register arithmetic for details.

Calculations Using Constants

The CALC 1 register arithmetic system can also be used to add, subtract, multiply and divide the displayed x value by a stored constant.


For the functions that worksheets provide, CALC 1 uses either a Focused Calculator or a Formula Calculator. The CALC 1 calculators allow you to store, recall and compute the required values in any order without having to "arrow" through a list.

Below is a list of worksheets and the CALC 1 calculators used for that functionality.


TI BAII Plus CALC 1 Comments
Time Value of Money

Financial Time Value of Money I/YR Calculator

Time Value of Money Form Calculator

Amortization Financial Amortization Calculator Also see the Amortization Form Calculator.
Cash Flows Financial Cash Flows Calculator In addition to IRR and NPR, CALC 1 calculates MIRR. Up to 1,000 cash flows that can be easily edited and re-ordered using the List Manager.

Financial Depreciation Calculator

Depreciation Form Calculator.

SL, SOYD, DB and DBX with starting month calculations.

Financial Bonds Calculator

Bonds Form Calculator

CALC 1 has 5 different date basis and 3 frequencies.
Statistics Statistics: 1 List Calculator
Statistics: 2 List Calculator
List based statistics for 1 & 2 lists. Up to 1,000 cash flows that can be easily edited using the List Manager. List based statistics can calculate median, min, max that cannot be calculated with calculators that aggregate their statistics.
Curve Fitting Curve Fitting: LIN Calculator
Curve Fitting: Ln Calculator
Curve Fitting: EXP Calculator
Curve Fitting: PWR Calculator
Separate calculators for each type of curve fitting.
Percent Percent Change Formula Calculator
Percent Change with Periods Formula Calculator

Many calculators have %, Δ% (percent change) and %T (percent of total) keys for quick percentage calculations.

The Math General calculator has percentage calculations.

Interest Conversion Effective Interest Rate Formula Calculator  
Date DAYS Function Formula Calculator
DAYS360 Function Formula Calculator
The TVM and Bond Calculators have date keys for quick date calculations.
Profit Margin Profit Margin Formula Calculator  
Breakeven Breakeven Formula Calculator  

CALC 1 has the following calculators for the financial solutions NOT FOUND on the TI BA:

  CALC 1 Comments
Currency Conversions Currency Conversions Form Calculator This performs conversions from any Focused or Formula calculator by tapping the CALC 1 logo.
Conversions Conversions Form Calculator This performs conversions from any Focused or Formula calculator by tapping the CALC 1 logo.
Customization Customization
  1. Copy and paste keys to customize a calculator. Rearrange keys on a calculator or copy them from another calculator.
  2. Create new keys to have your own 1-key solution using the Key Editor. Also modify existing keys or view the formulas.
  3. Create your own formula calculator that focuses on a single formula.