Short answer
Use about 20 to 28 point bold for the name and 12 to 14 point for the title on a 1 x 3 inch badge, in a plain sans serif. That keeps the first name readable from roughly six feet, which is the distance across a counter or desk.
What to know
- Bold sans serif (Arial, Helvetica, Verdana style) reads best at distance.
- Avoid script and thin fonts for the name line.
- All caps looks tidy for short names but reads slower for long ones.
- Dark on light or light on dark, never mid-gray on silver.