Question 1

How many pixels are in a rem?

Accepted Answer

1 rem = 16 pixels, based on the standard 16px browser default root font size.

Question 2

How is the conversion calculated?

Accepted Answer

Every unit is stored as a fixed multiple of pixels, assuming a 16px root font size and 96 DPI. To convert, we multiply your value by the source unit's factor to get pixels, then divide by the target unit's factor.

Question 3

Does em always equal 16px?

Accepted Answer

Only under this converter's assumption. Em/rem conversions here assume a 16px base font size, the common browser default — but an element's actual em size depends on its parent's font size in real CSS.

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