There are two values that can be used to set font size - pixels (px) and points (pt). These values are not equal - for example, a font size of 10pt is 13px.
You may need to work out the equivalent value for your font sizes, for instance if you know that your text needs to be 11px, but your mail client uses pt.
For more information on applying font sizes, see How to use pixel and point values in font sizing.
The following table displays the value equivalence between pixels and points.
This means that if you set a value of, for example, 15px, and Microsoft Outlook uses points, your text will display at 11pt.
| Pixel value | Point value | Typical size rating |
| 8px | 6pt | |
| 9px | 7pt | |
| 10px | 7.5pt | x-small |
| 11px | 8pt | |
| 12px | 9pt | |
| 13px | 10pt | small |
| 14px | 10.5pt | |
| 15px | 11pt | |
| 16px | 12pt | medium |
| 17px | 13pt | |
| 18px | 13.5pt | large |
| 19px | 14pt | |
| 20px | 14.5pt | |
| 21px | 15pt | |
| 22px | 16pt | |
| 23px | 17pt | |
| 24px | 18pt | x-large |
| 26px | 20pt | |
| 29px | 22pt | |
| 32px | 24pt | xx-large |
For values outside of this table, use the following conversion:
For example, 19pt = 25px (rounded to the nearest whole value).