Pixel to vh/em/rem Converter | CSS Unit Conversion Tool
Have you ever wondered why your web layout looks perfect on desktop but breaks on mobile? That’s where a Pixel to vh/em/rem Converter comes in handy. In the modern world of responsive design, fixed units like pixels simply don’t scale across devices. This CSS unit conversion tool lets you convert px to vh, convert px to rem, or switch to em effortlessly.
Let’s dive into how you can design smarter, more flexible websites using this powerful and easy-to-use converter by hcalculator.
PX to REM Converter
PX ↔ REM Conversion Tables
A conversion table helps you visualize the relationship between px and rem. If your root font-size is set at 16px, then:
|
PX |
REM |
|
16px |
1rem |
|
32px |
2rem |
|
48px |
3rem |
|
8px |
0.5rem |
Convert Pixels to REM
To convert px to rem, use this simple formula: REM = PX / Root Font Size
For example, 32px ÷ 16 = 2rem
An Example
Let’s say you want a heading that’s 48px. With a root font-size of 16px, your REM value will be:
48 ÷ 16 = 3rem
EM vs. REM: The Differences
EM is relative to the parent element’s font-size, while REM is relative to the root element. That makes REM more predictable and easier to manage across your layout.
PX TO VH
A Converter That Calculates the VH from a PX for a Given Breakpoint
Want to size elements relative to screen height? Use vh units. The Pixel to vh/em/rem Converter by hcalculator calculates values for you based on the viewport height.
PX to VH Conversion Table if Viewport Height Is 1080px
|
PX |
VH (1080px height) |
|
108px |
10vh |
|
540px |
50vh |
|
1080px |
100vh |
More PX & VH Conversions
This tool handles px to vh across any viewport size. Whether you’re working on a 512×384 screen or a 4K display, you get accurate scaling.
How to Convert PX to VH?
Use this formula:
VH = (PX / Viewport Height) × 100
Example: 100px on a 1000px tall screen = (100 / 1000) × 100 = 10vh
What Is the PX to VH Formula?
It’s simply:
(px ÷ total viewport height) × 100 = vh
What Is VH Unit? (Viewport Height)
1vh equals 1% of the height of the viewport. If the screen height is 900px, 1vh = 9px.
What Is PX Unit? (Pixels)
Pixels are fixed-size units. They don’t scale unless managed using relative units or media queries.
Why Fixed Pixels Fail in Responsive Design
Initially, I designed using px units only. While it worked on desktops, layouts broke on mobile. Later, I realized the power of CSS units like vh, em, and rem. A Pixel to vh/em/rem Converter lets you generate relative values that scale across screen sizes.
It factors in viewport dimensions, default font-size (usually 16), and makes it easier to size elements using formulas. It’s great for breakpoints, helping you create consistent designs.
How a Converter Simplifies Your Workflow?
When I started building responsive pages, I often faced inconsistency in font sizes and element spacing. Using a converter like hcalculator gave me better control. It allowed me to scale headings, paragraphs, and layouts using rem instead of guessing in pixels.
The conversion is instant. Enter a value in one field, and the result appears in another. Whether converting pixels to vh or rem to px, it works both ways. I now suggest this to all new developers aiming for a modern, adaptable UI.
Understanding CSS Units
Absolute Unit vs. Relative Unit
- PX is an absolute unit.
- VH, EM, and REM are relative.
What Is 1rem?
It equals the root font-size, which is typically 16px.
What Is 1em?
1em equals the font-size of its parent. It can cascade based on nesting.
Root Font Size and Root Element
The root element (usually <html>) sets the font-size. Changing it affects all rem units.
Relative to the Font Size and Parent Element
REM is based on the root; EM on the parent. That makes REM better for consistency.
Size of an Element
Use relative units for scalability. Let the font or viewport define the size.
Responsive Typography and Layout
Font Size Across Different Screen Sizes
Use rem to maintain font consistency on desktop, tablet, and mobile.
Using Viewport Units for Full Height and Width
Need full-screen sections? Use 100vh or 100vw in your layout.
Viewport Units: VH, VW, and Responsive Websites
VH and VW are essential for responsive design. They adjust as per screen size.
Media Queries and Breakpoints
Pair vh, rem, or em with media queries for device-based responsiveness.
@media (max-width: 600px) {
h1 {
font-size: 2rem;
}
}
Proportionally Scaled Design Process
Instead of guessing, use a calculator to apply formulas, scale proportionally, and build reliable layouts.
Tools and Features
CSS Unit Converter
Whether converting px to vh, rem, or em, this CSS unit converter tool is all you need.
Online Calculator for px to vh/rem/em
Use the online calculator on hcalculator.com to run live, real-time conversions.
Hot Keys and Shortcuts
Use shortcuts like Ctrl+R to reset or Tab switch fields.
Share and Save Settings
Share results or save settings for future design sessions.
© 2025 CSS Unit Converter by hcalculator
Proudly developed by hcalculator for scalable, responsive web projects.
FAQ
Q1: How do I convert 100px to rem?
If your root font size is 16px, then 100 ÷ 16 = 6.25rem
Q2: What is better for responsiveness, vh or rem?
Use vh for height scaling, rem for font scaling.
Q3: Can I use both px and rem in the same stylesheet?
Yes, but using relative units ensures better scaling.
Q4: Why do developers prefer rem over em?
Because rem is based on root, making it more predictable.
Q5: Will this tool work for a DPR of 2 devices?
Yes, hcalculator adapts across high DPI screens too.