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Free Unit Converter

Convert measurements for length, weight, temperature, volume, speed, pressure, data storage, and more. Get instant results with standard conversion factors in a clean browser-based calculator.

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Popular Unit Converters

Quick access to common measurement conversions like kg to lbs, cm to inches, celsius to fahrenheit, liters to gallons, and mph to km/h

Length Converter

Meters, feet, inches, miles

Feet to Meters Inches to CM

Weight Converter

Kilograms, pounds, ounces

Kg to Lbs Oz to Grams

Temperature Converter

Celsius, Fahrenheit, Kelvin

°C to °F °F to °C

Area Converter

Square meters, acres, hectares

Sq Ft to Sq M Acres to Ha

Volume Converter

Liters, gallons, cubic meters

L to Gal ML to FL OZ

Speed Converter

km/h, mph, m/s, knots

KMH to MPH Knots to MPH

How to Convert Units

Select Category & Units

Choose from 25+ measurement categories — length, weight, temperature, and more. Then pick your source and target units from the dropdown menus.

Enter Your Value

Type any number — whole, decimal, or negative. The conversion result appears instantly as you type, with no button press needed.

Read the Result

Your converted value is shown with NIST-standard accuracy. Use the "Swap Units" button to reverse the conversion direction.

Why Choose Our Unit Converter

100+ Unit Types

Convert across 25+ categories including length, weight, temperature, volume, speed, pressure, energy, power, and data storage.

Instant Results

Results update in real time as you type — no submit button, no page reload. See your converted value the moment you enter a number.

No Sign-up Required

Completely free with no registration, no hidden fees, and unlimited conversions. All 1000+ units are available at no cost.

Works Offline

All conversions run client-side in your browser. Once the page loads, you can convert units even without an internet connection.

Scientific Precision

All conversion factors are sourced from NIST standards with up to 15 decimal places of precision, suitable for engineering and scientific work.

Mobile Friendly

Fully responsive design works perfectly on smartphones, tablets, and desktops with a touch-friendly interface and numeric keyboard support.

Unit Converter — FAQ

Quick answers about measurement conversion, metric-to-imperial calculations, and unit converter accuracy.

How accurate is this unit converter?
Our converter uses NIST-standard conversion factors with up to 15 decimal places of precision, making it suitable for professional engineering and scientific calculations.

Is this converter really free?
Yes. You can switch between metric, imperial, scientific, and engineering units without creating an account or paying for access. The calculator is designed for quick checks as well as repeated day-to-day use.

Can I use this on mobile devices?
Yes. The layout is responsive, the fields work well with mobile keyboards, and the calculator stays easy to use on phones, tablets, and desktop browsers.

What categories of conversions are supported?
The converter covers everyday and technical categories such as length, mass, temperature, area, volume, speed, pressure, energy, power, angle, time, and digital storage. That makes it useful for schoolwork, lab calculations, travel, recipes, construction, and engineering reference.

Why are temperature conversions different?
Temperature conversions use formulas rather than a single multiplier because each scale has a different zero point. Celsius, Fahrenheit, and Kelvin measure heat on different reference systems, so the calculator applies the right offset and scaling automatically.