If your laptop supports Bluetooth wireless but doesn't have a keypad, then check out the Bluetooth Calculator Keypad for Windows and Mac from Interlink Electronics. Since this calculator supports Bluetooth wireless, you can use it away from your computer cord-free within a range of 33 feet. You can either use it as a fully-functional calculator or as a 10-key numberpad for adding numbers into spreadsheets or for general data entry. The calculator features an 18-key numeric keypad and a 12-digit LCD display. Battery-powered and compatible with either Mac or Windows computers, the calculator lets you work away from your laptop in the office, the meeting room, or at home.
Built-in fully functional calculator
Also works as a ten-key number pad for use with spreadsheets and data entry applications
Calculations on the keypad can be sent directly into a spreadsheet on your computer like you just typed them
Works within a range of up to 33 ft
Utilizes two AAA Alkaline batteries and features a power-low indicator
Supports Windows and Mac operating systems