The equation display shows all of the operations you have entered since the last time Clear All () was pressed.
You can scroll up or down and make changes to any line. Any changes will be reflected instantly in the calculations.
If the line you want to change is not already highlighted, scroll to the desired line and select it by tapping it one time. Once the line has been selected you have the following options:
- Change the value on the line by entering a new number
- Change the operator on the line by entering a new operator
- Change by the value and the operator
- Clear the line and enter a new operation
- Activate the In-Line Menu (see Advanced Topics)
Shift Functions are printed above the keys. will swap the Function keys with their Shift Function counterparts. Press again to swap back to the original Function keys.
Dates are recognized by use of the key. Date Operations can be performed on dates to calculate past dates, futures dates, elapsed days, etc. (see Controls for settings to include or exclude days from date math).
OmniCalc® can display up to 16 digits plus a minus sign and a 2 digit exponent. Results with more than 16 digits will display in scientific notation.
OmniCalc® has a 100 by 100 memory matrix. The figure below shows the layout of OmniCalc®‘s 100 Memory Registers.
Each Memory Register has the capacity to hold 100 Data Elements. Advanced Statistical Operations explains more about accessing Data Tables. Additional operations that access Memory are described in Basic Memory Operations, Advanced Memory Operations and Basic Statistical Operations
Clear the line at the current cursor location
Erase all lines
Hold for 2 seconds to clear all operations, memory registers and statistical data tables.
Hold for 4 seconds to exit FORM mode and also clear all operations, memory registers and statistical data tables.
The operator will complete all pending operations and display the final results on a single line.
If the cursor is located above an , then pressing will move the cursor to the next line with an operator until reaching the last operator in the series of operations.
Parenthetical expressions can be nested to a depth of 100 levels within and brackets.
Pressing after a bracket will close any remaining open parentheses before completing the operation.
- 1 1 2
- 10 2 8
- 5 6 30
- 35 7 5
- 15 6 -9
- Absolute value
- -5 6 11
- 5 100 20
- Fix to k
- 5.12853 2 5.12
- Round to k
- 5.12853 2 5.13
Basic Memory Operations use Data Element  of Memory Register 
- Add to Memory
- Subtract from Memory
- Recall from Memory
- Clear Memory
Advanced Memory Operations use Data Element  from any of the referenced Memory Registers  through 
- Put in Memory Register [##]
- 45 
- Add to Memory Register [##]
- 25 
- Subtract from Memory Register [##]
- 5 
- Recall from Memory Register [##]
-  65
Notes: Clear Memory: Holding for 2 seconds will clear all operations, all memory registers and all statistical data tables.
Clear Form: Holding for 4 seconds will exit FORM mode, clear all operations, all memory registers and all statistical data tables.
- Add Days
- 1/1 12 01/13/2010
- 5 12/16 12/21/2010
- Subtract Days
- 5/2 10 04/22/2010
- Subtract Dates
- 5/2 4/3 29
- Percentage (10% of 1000)
- 1000 10 100
- Ratio (Ratio of 30 to 6)
- 30 6 500
- Increase (Add 18% to $25.00)
- 25 18 29.50
- Discount (Marked down 9% from $100.00)
- 100 9 91
The PI constant is calculated internally as 3.14159265358979323846264338327
Generates a random value between 0 and 232
Inserts the current date in the format MM/DD/YYYY
Beginning of the Month
Inserts the first day of the current month in the format MM/DD/YYYY
End of the Month
Inserts the last day of the current month in the format MM/DD/YYYY
calculates the sum of a sequence of numbers from 1 to n
- 232 27028
calculates the product of a sequence of numbers from 1 to x
- 7 5040
A permutation is an arrangement of objects in which order is important.
calculates the number of possible permutations of n items taken r at a time.
An example would be to calculate the number of possible outcomes for the first, second and third place positions of a horse race if there are 8 horses in the running.
- Number of Permutations
- 8 3 336
A combination is an arrangement of objects in which order is not important.
calculates the number of possible combinations of n items taken r at a time.
An example would be to calculate how many different combinations of 5 cards each can be dealt from a deck of 52 cards.
- Number of Combinations
- 52 5 2598960
- 5 25
- Square Root
- 36 6
- Power of Y
- 9 3 729
- Root of Y
- 16 4 2
- 100 2
- 2 100
- Natural Logarithm
- 5 1.609437912434
- Exponential Function
- 1.609437912434 5
e constant is calculated as 2.7182818284590451
Trigonometric Functions will be based on angular units represented in Degrees, Radians or Gradians. You can change the angle units for all Trigonometric Functions in the OmniCalc® Controls. The default setting is Radians.
- 1 1.557407724655
Inverse Trigonometric Functions will either have a direct access button as shown below or they will be accessed by pressing the button (see Controls for more about keyboard layouts).
- Inverse Sine
- Inverse Cosine
- Inverse Tangent
Hyperbolic Functions will either have a direct access button as shown below or they will be accessed by pressing the button (see Controls for more about keyboard layouts).
- Hyperbolic Sine
- Hyperbolic Cosine
- Hyperbolic Tangent
Inverse Hyperbolic Functions will either have a direct access button as shown below or they will be accessed by pressing the and buttons (see Controls for more about keyboard layouts).
- Inverse Hyperbolic Sine
- Inverse Hyperbolic Cosine
- Inverse Hyperbolic Tangent
Basic Statistical Operations use Data Elements  through  from Memory Register 
- Insert Data Element
- Delete Data Element
- Number of Data Elements
- Average of Data Elements
- Minimum Data Element
- Maximum Data Element
- Sum of Data Elements
- Sample Standard Deviation
- Population Standard Deviation
Advanced Statistical Operations use Data Elements  through  from any of the referenced Memory Registers  through 
- Insert Data Element to Register [##]
- 15 
- Delete Data Element From Register [##]
- 25 
- Number of Data Elements in Register [##]
-  3
- Average of Data Elements in Register [##]
-  15.3333
- Minimum Data Element in Register [##]
-  12
- Maximum Data Element in Register [##]
-  19
- Sum of Data Elements in Register [##]
-  46
- Sample Standard Deviation from Register [##]
-  3.511884584284
- Population Standard Deviation from Register [##]
-  2.867441755681
The OmniCalc® controls is where you can change the style and certain behaviors of your calculator.
Slide your finger across any non-blank line in the equation display to activate the In-Line Menu.
The In-Line Menu gives you the following options:
INSERT – insert a new line into the equation
DELETE – delete the selected line
LABEL – label the selected line
CANCEL – clear the menu without making changes