You can use the built-in Calculator in Windows to carry out Decimal to Binary conversions. The Windows Calculator file is a UWP app and to open it, type calc in the Start Search bar, and hit Enter.

Warnings Excel will only produce binary numbers with up to 10 bits. This means that it can only convert decimal numbers greater than -513 and less than 512.

Decimal numbers between 100 and 109 would be represented in BCD by the actual number + 156 (26*6). Numbers between 110 and 119 convert to BCD values of the actual number + 156 + 6.