Free Online Unit Converter
Convert 74+ Units Instantly
The most comprehensive free unit converter tool online. Convert length, weight, temperature, volume, area, speed, power, energy, and 74+ more unit types instantly.
Fast, accurate, completely free. No registration required. Perfect for students, engineers, scientists, and everyday use.
Browse Converter Categories
Common Converters
Essential unit conversions for everyday use including length, weight, volume, and temperature.
18 converters available
Engineering Converters
Specialized converters for engineering applications including velocity, acceleration, and torque.
8 converters available
Heat Converters
Thermal property conversions for heat transfer, conductivity, and thermal resistance.
10 converters available
Fluids Converters
Fluid mechanics conversions including flow rate, viscosity, and concentration.
10 converters available
Light Converters
Optical and lighting conversions for luminance, illumination, and wavelength.
5 converters available
Electricity Converters
Electrical property conversions for charge, current, resistance, and capacitance.
15 converters available
Magnetism Converters
Magnetic property conversions for flux, field strength, and magnetic force.
4 converters available
Radiology Converters
Radiation measurement conversions for activity, exposure, and absorbed dose.
4 converters available
Why Use Our Converters?
Lightning Fast
Get instant conversions as you type with zero delays. No page reloads, no waiting time - just fast and efficient results
Highly Accurate
Trusted precision using industry-standard conversion factors and formulas. Perfect for engineers, scientists, and students
Completely Free
No hidden costs, no registration required, no ads blocking your way. Access all 74+ converters without any limitations
Global Access
Works anywhere in the world, online 24/7. Cloud-based platform ensures you never lose your conversions
100% Privacy
Your data stays on your device. We don't store, track, or share any of your conversions or personal information
Easy to Use
Intuitive interface designed for everyone. No learning curve - just enter your values and get instant results
Most Popular Converters
Length Converter
Meters to feet, inches to cm, and more
Weight Converter
Kilograms to pounds, grams to ounces
Volume Converter
Liters to gallons, ml to fl oz
Temperature
Celsius to Fahrenheit and Kelvin
Area Converter
Square meters to square feet
Speed Converter
Km/h to mph, m/s conversions
Energy Converter
Joules to calories, kWh conversions
Pressure Converter
PSI to Pascal, bar conversions
Complete Guide to Unit Conversion
Understanding Unit Conversions
UnitConvertFree.com is your ultimate free online unit conversion tool. Convert between metric, imperial, US customary, and specialized units instantly. From converting meters to feet, kilograms to pounds, Celsius to Fahrenheit, liters to gallons, or any other unit conversion, our fast and accurate converter provides instant results with precision. Perfect for homework, engineering projects, cooking recipes, travel planning, and professional work. All conversions are completely free, no registration required, and work seamlessly on desktop, tablet, and mobile devices.
Unit conversion is the process of converting a measurement from one unit to another within the same dimension. If you're working with length, weight, volume, temperature, or any other physical quantity, understanding how to convert between units is essential in daily life, education, science, and engineering.
Common Use Cases
- Daily Life: Converting recipes, measuring spaces, comparing prices
- Education: Homework, exams, science projects, and research
- Engineering: Design calculations, material specifications, technical drawings
- Science: Laboratory measurements, research data, publications
- Business: International trade, logistics, manufacturing
- Travel: Currency exchange, distance calculations, temperature preferences
Why Choose Our Free Converter?
Our comprehensive collection of 74+ unit converters covers everything from basic measurements like length and weight to specialized conversions for engineering, thermodynamics, electricity, and radiation. All our converters are free to use, require no registration, and work seamlessly on any device. With instant results and industry-standard precision, we're the go-to choice for students, professionals, and everyday users worldwide.
Popular Conversion Categories
We offer converters in 8 major categories: Common Converters (length, weight, volume), Engineering Converters (velocity, acceleration, torque), Heat Converters (thermal conductivity, heat flux), Fluids Converters (flow rate, viscosity), Light Converters (luminance, illumination), Electricity Converters (voltage, current, resistance), Magnetism Converters (flux density, field strength), and Radiology Converters (radiation dose, exposure). Each converter is designed with accuracy and ease of use in mind.
Frequently Asked Questions
Is this converter free to use?
Yes, absolutely! All our 74+ converters are completely free with no hidden costs, no registration required, and no ads blocking your way.
How accurate are the conversions?
Our converters use industry-standard conversion factors and formulas, ensuring precise results suitable for professional use.
Do you store my data?
No, we don't store, track, or share any of your conversions or personal information. All calculations happen locally on your device.
What units are supported?
We support metric, imperial, US customary, and specialized units across all major categories including length, weight, volume, temperature, and more.
Can I use this on mobile devices?
Yes! Our platform is fully responsive and works perfectly on smartphones, tablets, and desktop computers.
Are there any conversion limits?
No limits! Convert as many values as you need, as often as you want, completely free and unlimited.