EM ⇄ PX Calculator
Convert between em and px based on an element's base font size. Enter your values, click Calculate, and get the full result with its breakdown — everything is processed on your device, nothing is sent to a server.
All calculations run in your browser. Your data is never sent to our servers.
Example
Example Input
2 em (base 16)
Example Output
32px
How to Use
- 1Fill in each input field with the values you want to compute.
- 2If there are choices (units, mode, operation), pick what you need.
- 3Click the Calculate button (or press Ctrl+Enter).
- 4The main result and its breakdown appear in the Result area. Click Copy to copy it.
About the EM ⇄ PX Calculator
The EM ⇄ PX Converter changes em to px and back. Unlike rem which is relative to the root, em is relative to the parent element's font size — so set the base size to match your context.
Useful for components that scale relative to their local font.
FAQ
Is this EM ⇄ PX Calculator accurate?
Yes. It uses standard formulas and runs directly in your browser at full JavaScript precision (plus BigInt/decimal.js for large numbers where needed).
Is my data sent to a server?
No. All calculations happen entirely on your device. No values are sent to or stored on our servers.