This will convert the digit from Decimal to Binary. For example, I opted to convert 2015 into Binary, and the converted digit came to 11111011111. You can also add Windows Calculator to Excel ...

Create a table or use an existing one. Type =DEC2BIN(A2, B2) into the cell you want to place the result. Then press the Enter key to see the result. To see the other results in the table ...

Storing in binary isn’t a good option ... Its called DPD or densely packed decimal. You can convert three decimal digits into ten bits and then back again with no real math at all.