CALC 1 has a HP 10bii reproduction. This page is a guide to the features of CALC 1 from a 10bii users perspective.
At the bottom of the page are tables of detailed features.
The default "Financial: TVM I/YR" Focused Calculator is similar to the HP 10bii. 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.
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".
CALC 1 supports chain (CHN), algebraic (ALG) and Reverse Polish Notation (RPN) calculation methods. See Calculation Methods Used by CALC 1 for an overview of each system.
CALC 1 default chain mode is similar to the chain mode on the HP 10bii except CALC 1 will display the first number and the operator instead of the "PEND" annunciator.
When enter a new number, the "del" key will erase the last digit entered. The "del" key will clear an entered number.
Tap the "del" key to clear error messages.
Each Focused Calculator will have keys for clearing that you see when you tap the "shift" key". They typically are:
"clr x" to clear the x register (the bottom number in the display.
"clr s" tap clear the stack.
"clr m" to clear the user memory variables, az.
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 annunciators that a hardware calculator needs.
CALC 1 has one 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.
CALC 1 has separate statistics Focused Calculators instead of a statistics shift key since it performs many more statistical calculations.
Use the = or ENTER key between numbers to put a number in the stack for two number operations like Δ%.
The CALC 1 SWAP key is used to swap the x and y registers in the stack. Since CALC 1 can display two or more values, the SWAP key is not needed to view the results of functions that return two values.
CALC 1 also has a ROLL key to roll the automatic stack to use previous results in a chain calculation.
CALC 1 has many math functions for each Focused Calculator. See the help page for the calculator. Two number functions are similar for CALC 1 except you can use ENTER key instead of the INPUT key.
CALC 1 display options can be set in the Options view. You have the 3 number styles (None, Decimal and Scientific), the number of digits and rows to display. CALC 1 also has an option to use significant digits.
The number of digits can also be adjusted using the iOS pinch gesture. The number of rows can be changed by swiping up and down on the display.
On many calculators there is a "DEC x" to set the number of decimal places. You key in the number of decimal places then tap the "DEC x" key.
See the CALC 1 User Guide for links to videos on gestures.
There is no need for a setting for interchanging periods and commas. This setting is handled automatically and is determined by the region setting on your device.
CALC 1 has RND keys on many of the calculators to round to the number of digits displayed. Some financial calculators also have the RND(2) key to round to 2 places regardless of the number of decimal places displayed. If the RND key is not on a Focused Calculator that you use, you can copy and paste the key to that calculator.
See the page on CALC 1 Percentage Calculation Keys for calculating percentages.
CALC 1 also has the following Formula Calculators for percentage calculations:
CALC 1 has the following Formula Calculators for margin and markup calculations:
CALC 1 uses the "ra" register arithmetic for both repetitive adding, subtracting, multiplying and dividing.
The Math: General calculator has the "+ tax" key for repetitive percentage calculations (sales tax, tips, ...)
The Math: General calculator has RM. M+, M CM and M% (percent of M) keys to store, recall and sum numbers using the
CALC 1 uses az variables for user memory instead of numbered registers.
CALC 1 has the following calculators for the financial solutions found on the HP 10bII:
HP 10bII  CALC 1  Comments 

Time Value of Money  Compounding periods can also be set for cases where the payments and compounding periods differ.  
Amortization  The Financial Amortization Calculator allows to to set the starting and ending period and has a key to advance to the next periods. There is also no need to reset the "N" or "PV" values if you want to go out of order. The calculations for each set of periods are save in the CALC 1 History. 

Markup and Margin  Markup as Percent of Cost Markup as Percent of Price 

Interest Conversion  Effective Interest Rate Formula 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 reordered using the List Manager. 
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. 
CALC 1  Comments  

Bonds  CALC 1 has 5 different date basis and 3 frequencies.  
Depreciation  SL, SOYD, DB and DBX with starting month calculations.  
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. (Linear curve fitting is included with the HP 10bII) 
Interest Conversion  Effective Interest Rate Formula Calculator  
Profit Margin  Profit Margin Formula Calculator  
Breakeven  Breakeven Formula Calculator  
Dates  Dates Form Calculator 
The TVM and Bond Calculators have date keys for quick date calculations. 
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 
