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PX ↔ REM ↔ EM Converter — Live, Visual, Batch

CSS px ↔ rem ↔ em converter — visual scale, base font size adjustable.

  • Runs locally
  • Category Calculator
  • Best for Getting a realistic range before a purchase, plan, workout, or schedule decision.
px
px
px
rem
em
pt
Live preview at this px (16px)
The quick brown fox jumps over the lazy dog
Common breakpoints
pxremempt
120.750.759
140.8750.87510.5
161112
181.1251.12513.5
201.251.2515
241.51.518
322224
483336
644448
Batch convert
Paste a list (e.g. "12px 14 16 18 24 32") to get a full table
pxremempt
120.750.759
140.8750.87510.5
161112
181.1251.12513.5
201.251.2515
241.51.518
322224
483336
644448

What this tool does

A four-way CSS unit converter for front-end developers and designers. Type a value in px, rem, em, or pt and the other three recompute live — no submit button, no round-trip lag. The root (html) font size defaults to 16px (the browser default) but you can override it from 12 to 24 to match a design system that shipped a custom base. Em uses a separate "parent" font size so you can sanity-check how a nested component scales relative to its container, not just to root. A live preview renders sample text at the current pixel size, so you can tell at a glance whether 1.125rem actually looks like a heading. Batch mode takes a list like "12px 14px 16px 18px 24px 32px" and outputs a clean px → rem / em / pt table you can paste into a design spec. A built-in reference shows the canonical breakpoints every CSS framework agrees on (12px = 0.75rem, 16px = 1rem, 24px = 1.5rem, 32px = 2rem). 100% client-side; nothing leaves your browser.

Tool details

Input
Text + Numbers
The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output
Live result + Copy + Preview
The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy
Browser-side processing
The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share
No account required
Open the page and use it; whether results survive refresh depends on the tool.
Performance budget
Initial JS <= 12 KB
No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit
Calculator · Developer
Category and role tags drive related tools, internal links, and quick fit checks.

How to use

  1. 1. Input

    Paste or drop your content into the tool panel.

  2. 2. Process

    Click the button. All processing is local in your browser.

  3. 3. Copy / Download

    Copy the result or download to disk in one click.

How PX REM EM Converter fits into your work

Use it for fast estimates, comparisons, and planning numbers before you make the final call.

Calculation jobs

  • Getting a realistic range before a purchase, plan, workout, or schedule decision.
  • Comparing scenarios by changing one input at a time.
  • Turning rough assumptions into a number you can discuss.

Calculation checks

  • Double-check units, dates, rates, and rounding assumptions.
  • Treat health, finance, tax, and legal outputs as planning aids, not professional advice.
  • Save the inputs that produced an important result so you can reproduce it later.

Good next steps

These links move the current task into a more complete workflow.

  1. 1 CSS Formatter & Minifier Format and beautify CSS — sort properties, indent rules, expand or minify. Open
  2. 2 CSS Box Shadow Generator Visual CSS box-shadow builder — multi-layer, inset, color/blur with live preview. Open
  3. 3 Unit Converter Convert between length, weight, temperature, area, volume, speed, time — instant, browser-only Open

FAQ

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Made by Toolora · 100% client-side · Updated 2026-06-13