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Free Unit Converter

Convert between any units with our free online calculator. Supports length, weight, temperature, volume, area, speed, pressure, energy and 15+ measurement categories. Get instant accurate conversions between metric and imperial systems with real-time results as you type.

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Professional Unit Converter

Convert between 500+ different units with scientific precision. Supports length, weight, temperature, volume, area, speed, energy, and 15+ specialized measurement categories.

500+
Units Supported
15+
Categories
100%
Free Forever

Scientific Accuracy

International conversion factors with precision up to 15 decimal places. Trusted by engineers, scientists, and professionals worldwide.

Universal Compatibility

Works seamlessly on desktop, mobile, and tablet. Supports metric, imperial, and international scientific unit systems.

Always Free

No registration, advertisements, or usage limits. Professional-grade conversions available to everyone, forever.

How to Use Our Unit Converter

Simple 4-step process for accurate unit conversions between any measurement systems

1. Select Category

Choose from 15+ categories including length, weight, temperature, volume, area, speed, energy, pressure, and specialized scientific units.

2. Choose Units

Select source and target units from our comprehensive database. Supports metric, imperial, and international scientific unit systems.

3. Enter Value

Type any number including decimals, fractions, or scientific notation. Supports unlimited precision for professional calculations.

4. Get Results

View precise converted values instantly with real-time updates as you type. No delays, loading times, or refresh needed.

💡 Professional Conversion Tips

Expert recommendations for maximum accuracy and efficiency

Decimal Precision

Use decimal notation (5.5) instead of fractions (5½) for maximum accuracy in scientific and engineering calculations.

Quick Swap

Use the swap button to instantly reverse conversion direction without re-entering values or changing selections.

Real-time Updates

Results update automatically as you type, perfect for comparing multiple values and exploring different scenarios.

Mobile Optimized

Fully responsive design works flawlessly on smartphones and tablets with touch-friendly interface and gestures.

Complete Unit Conversion Suite

Professional-grade converters for every measurement used in science, engineering, and daily life

Length & Distance

Metric & Imperial Units

Convert between all length units including meters, feet, inches, kilometers, miles, and specialized measurements like nautical miles and light-years.

15+
Converters
25+
Units
Free
Forever
Most Popular Conversions
ft → m in → cm mi → km
Explore Length Converter
Most Popular

Weight & Mass

Precise Mass Calculations

Accurate weight conversions between metric (kilograms, grams), imperial (pounds, ounces, stones), and scientific units including atomic mass.

12+
Converters
18+
Units
Free
Forever
Most Popular Conversions
lbs → kg oz → g st → kg
Explore Weight Converter
Popular

Temperature

All Temperature Scales

Convert between Celsius, Fahrenheit, Kelvin, and Rankine scales for weather, cooking, and scientific applications with precise formulas.

6+
Converters
4
Scales
Free
Forever
Most Popular Conversions
°C → °F °F → °C K → °C
Explore Temperature Converter
Essential

Area

Land & Surface Measurements

Calculate area conversions for construction, real estate, and land measurement between square meters, acres, hectares, and square feet.

8+
Converters
15+
Units
Free
Forever
Most Popular Conversions
sq ft → sq m acres → ha sq m → sq ft
Explore Area Converter
Specialized

Energy

Work & Heat Measurements

Convert energy units for physics, engineering, and everyday applications including joules, calories, kilowatt-hours, and BTU.

12+
Converters
18+
Units
Free
Forever
Most Popular Conversions
kWh → J cal → J BTU → kWh
Explore Energy Converter
Essential

Power

Rate of Energy Transfer

Convert power units for electrical, mechanical, and automotive applications including watts, horsepower, BTU/hour, and kilowatts.

10+
Converters
14+
Units
Free
Forever
Most Popular Conversions
W → HP kW → HP BTU/hr → W
Explore Power Converter
Technical

Frequently Asked Questions

How accurate are the unit conversions provided?

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Is this unit converter completely free to use?

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Does the converter work on mobile devices and tablets?

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What's the difference between metric and imperial systems?

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Can I use this converter for professional and academic work?

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How do temperature conversions work?

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