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.

Learn how to use Windows Calculator to convert Decimal to Binary in Windows 11/10. You have to use the Programmer mode to do this.

Converting denary to binary To convert from denary to binary, start by subtracting the biggest place value you can from the denary number, then place a 1 in that place value column.