This is calculator app that allows you to display and modify formulas. It allows you to enter formulas while checking them, which prevents you from typing incorrectly or making calculation errors. It is also possible to reuse past formulas to change only certain values to calculate them.
The cursor indicates on the display, and you can tap or press the arrow keys to quickly navigate to where you want to edit. It has a powerful, flexible and intuitive user interface with support for swiping to scroll through formulas and long-tap to copy and paste.

[ Features ]
- Easy operation for editing formulas
- Re-calculation by using history
- Four arithmetic operations, root, percentages, time, tax and parentheses calculations
- Memory, M+, M-, MR, MC
- Scroll up/down lines
- Cut, copy and paste
- Expressions history and answer history
- Grouping separator and decimal point
- Various settings (Long tap MENU key)

[ What do you use "Calculator" for ]
- General calculator
- Tax and VAT
- Sales, profit and cost
- Split a payments at restaurant
- Long formulas calculation
- Formula include parenthesis
- Elapsed time, time addition and subtraction, production time, costing from time


[ Four arithmetic operations ]
1 + 2 - 3 × 4 ÷ 5 = 0.6
　
[ Time calculation ]
16:15 - 12:45 = 3:30:00

1.5 × (16:15 - 12:45) = 5:15:00
Press [H:M:S] key for changing value after calculation.
=5.25

[ Root calculation (Long press)]
√( 2 × 2) = 2
　
[ Percentage calculation ]
500 + 20% = 600
500 - 20% = 400
500 × 20% = 100
100 ÷ 500% = 20
　
[ Tax calculation ]
500 Tax+ = 525
525 Tax- = 500
　
[ Parenthesis calculation ]
( 1 + 2 ) × ( 3 + 4 ) = 21
( 1 + 2 ) ( 3 + 4 ) ( 5 + 6 ) = 231
　
[ Grouping separator and decimal point ]
123,456,789.1 + 0.02 = 123,456,789.12
123.456.789,1 + 0,02 = 123.456.789,12
(Depends on setting)
　

[ Display ]
Calculator indicates long expressions on the display. If you may mistake to input expressions, you can correct this expressions easily and quickly using by back space key, arrow keys and C(clear) key.

[ Re-play and history functions ]
Calculator has "Re-play function". It indicates expressions that you inputted in the recently using by △(re-play)key. If you long-press re-play key, expressions history table is available.

[ Last answer and history functions ]
Last answer is that indicates the last calculation result by using Ans key. If y