Unit Converter

Dev‑friendly conversions: px↔rem, HEX/RGB/HSL, bytes↔MB/GB/TB, time zones, durations, and more—built for pragmatic productivity.

⭐ Ranked #13 most popular tool on Hostt

Start Converting Units

Work across typography, colors, storage, time, and more

Typography: px ↔ rem/em

rem: 1.0000 • em: 1.0000

Color: HEX ↔ RGB ↔ HSL

Bytes: B ↔ KB ↔ MB ↔ GB ↔ TB

1,048,576 B total
B: 1,048,576
KB: 1,024
MB: 1
GB: 0.001
TB: 0
PB: 0

Temperature: °C ↔ °F ↔ K

Fahrenheit: 77.00
Kelvin: 298.15

Length: mm ↔ cm ↔ in ↔ pt

cm: 1.0000
in: 0.3937
pt: 28.35

Angle: degrees ↔ radians

Radians: 3.141593

Duration: ms ↔ s ↔ min ↔ h

s: 1.000 • min: 0.017 • h: 0.000

Bandwidth: bps ↔ kbps ↔ Mbps ↔ Gbps

kbps: 1000.000 • Mbps: 1.000 • Gbps: 0.001000

Time Zones

Converted: Loading current time…
Note: Time zone names should be valid IANA identifiers.

How to Use Unit Converter

  1. 1

    Choose a Conversion

    Pick from developer‑friendly groups: typography (px↔rem), colors (HEX/RGB/HSL), bytes, time zones, durations, angles, and more.

    Tip:You can use multiple panels independently—no page reloads needed.
  2. 2

    Enter Values and Options

    Provide inputs like base font size for px↔rem or select byte units. Values convert instantly and show results across related units.

    Tip:For colors, adjust any format—others stay in sync automatically.
  3. 3

    Validate Results

    Scan rounded and full‑precision values. Numeric ranges are clamped where appropriate (e.g., RGB channels).

    Tip:Use copy shortcuts in your OS to paste results into code.
  4. 4

    Apply in Your Workflow

    Drop the output into CSS, design tokens, README tables, or API documentation without context switching.

    Tip:Save typical bases (e.g., 16px) to standardize conversions across projects.

Security & Privacy

  • All conversions happen in your browser; no data is uploaded.
  • No inputs are logged or stored.
  • Results are computed instantly with no network calls.

Features & Benefits

🧰

Developer‑Centric Sets

Typography, colors, bytes, time zones, durations, angles, and more—suited to real workflows.

🔄

Bidirectional Sync

Change any color or unit and see related formats update immediately.

🎯

Precision & Clamping

Reasonable rounding and safe ranges for predictable results in code.

📋

Copy‑Ready Outputs

Results formatted for direct paste into CSS, JS, or docs.

🔒

Local‑Only Processing

Everything runs in your browser—nothing leaves your device.

⚡

Fast & Lightweight

Instant feedback without heavy libraries or network calls.

Frequently Asked Questions

Is any data sent to servers?

No. All conversions occur locally in your browser. Nothing is uploaded or logged.

Which color formats are supported?

HEX, RGB, and HSL with bidirectional syncing and a live swatch preview.

Do you support custom base font sizes?

Yes. Set a base (e.g., 16px) and convert px↔rem/em accurately for your project.

How accurate are byte conversions?

Bytes use base‑2 (×1024) conversions for KB/MB/GB/TB/PB to match developer expectations.

Can I convert between time zones?

Yes. Provide an ISO date/time and IANA time zone names to view converted results.

Any performance or size limits?

The tool is lightweight and instantaneous for typical inputs—perfect for daily development.

Technical Specifications

Domains: Typography, color, bytes, time
Processing: 100% client‑side
Precision: Reasonable defaults per unit
Limits: Browser memory/perf bounds
Privacy: No data uploaded
Compatibility: Modern browsers

Use Cases & Applications

Design Systems

Design System Tokens

Convert colors, spacing, and typography units while defining tokens.

Frontend

Responsive CSS

Translate pixel values to rems/em for accessible, scalable UIs.

Performance

Storage & Bandwidth

Compare payload sizes across KB/MB/GB and network speeds.

Operations

Time & Scheduling

Convert times between IANA time zones for releases or cron notes.

Documentation

Data Sheets & Docs

Copy precise tables into READMEs and technical documentation.

Engineering

Math & Utilities

Quick deg↔rad and duration conversions during code reviews.