Converter
CSS Units Converter
Use a CSS units converter to compare px, rem, em, pt, in, cm, mm, vw, and vh values in the browser.
CSS unit input
Convert a CSS value across the most common absolute and relative units.
CSS conversions
Review the converted values and copy the unit breakdown.
Why use a CSS units converter
A CSS units converter helps when you need to compare px, rem, em, and viewport-based values without doing the math by hand. It is useful when you want to convert CSS units quickly for design work, responsive layouts, or stylesheet reviews.
That makes the page useful for searches like CSS units converter, CSS unit converter, px to rem converter, rem to px converter, and viewport units converter because it keeps the math in the browser.
Convert CSS units with browser context
Enter a numeric value, choose the source unit, and the converter shows equivalent values in the other common CSS units. Base font size, viewport width, and viewport height are included so rem, em, vw, and vh conversions stay accurate.
This is helpful when you are sizing text, spacing, borders, or layout measurements and want a consistent CSS unit conversion reference.
Common CSS unit conversion use cases
Use a CSS units converter when you are matching design tokens, checking a responsive breakpoint, or translating measurements from a mockup into a stylesheet. It is especially useful when you are moving between pixels, rems, and viewport units during implementation.
Because the calculation happens locally in the browser, you can test values, compare unit output, and copy the result without leaving the page.
FAQ
What does a CSS units converter do?
It converts one CSS unit value into other common units such as px, rem, em, pt, in, cm, mm, vw, and vh.
Can I convert px to rem?
Yes. The converter uses the base font size to calculate px to rem and rem to px values.
Does it support viewport units?
Yes. vw and vh conversions use the viewport width and height values you provide.
Does it run locally?
Yes. The CSS unit conversion happens in the browser without sending your values to a server.
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