Press Ctrl+F1 to get a summary of all keyboard shortcuts.

Function Keys

Show keyboard shortcuts (Ctrl+F1)
Activate text input per item F2
Percent P
Sales Tax + F3
Sales Tax + F4 or T
Sales Tax 2 + Shift+1
Sales Tax 2 - Shift + 2
Memory M + F5 or (Ctrl+A)
Memory M - F6 or (Ctrl+M)
Memory M F7 or (Ctrl+H)
Memory MC F8 or (Ctrl+T)
Insert memory calculation into tape F9
Convert from EUR F11
Convert to EUR F12

Calculation

Delete current calculation Del or C
Delete current input or operation Esc
Complete current calculation Enter
Edit last input ^
Change sign V
Subtotal # or S
Double zero (00) Z
Square Root Q
Multiply M
Divide D
Exponent E
MU U
Grand Total of all tape totals G
Average value of all calculations on the tape. A
Inverse I
Use constant X. Configure in Settings/Options/Constants Y
Use constant Y. Configure in Settings/Options/Constants X

Universal Shortcuts

Create new tape (Shift+N)
Clear tape (Ctrl+N)
Change to next tape Tab
Change to previous tape (Shift+Tab)
Currency Calculator (Ctrl+W)
Edit Memorized Text List (Ctrl+B)
Number of decimal places displayed (Ctrl+0...6)
Show/Hide Keypad (Ctrl+Minus)
Move DeskCalc window (Ctrl+Arrow Keys)
Minimize to tasklist Space