Free Online Unit Converters That Just Work
15 fast, free, and private unit conversion tools. Every converter runs 100% in your browser — no data is ever sent to a server. No sign-up required.
15 converters & counting📏 Measurement
Length Converter
Convert between meters, feet, inches, kilometers, miles, yards, and more.
Weight Converter
Convert between kilograms, pounds, ounces, grams, stones, and tons.
Area Converter
Convert between square meters, square feet, acres, hectares, and more.
Volume Converter
Convert between liters, gallons, milliliters, cups, fluid ounces, and more.
🌡️ Science & Engineering
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Speed Converter
Convert between km/h, mph, m/s, knots, and Mach number.
Fuel Efficiency Converter
Convert between km/L, miles per gallon (US/UK), and L/100km.
Pressure Converter
Convert between Pascal, Bar, ATM, PSI, mmHg, and inHg.
Energy Converter
Convert between Joules, kWh, Calories, BTU, and Electronvolts.
Power Converter
Convert between Watts, Kilowatts, Horsepower, BTU/h, and more.
💻 Digital & Everyday
Data Storage Converter
Convert between bytes, KB, MB, GB, TB, and PB (binary & decimal).
Cooking Units Converter
Convert between cups, tablespoons, teaspoons, milliliters, and grams.
Time Zone Converter
Convert time between world time zones — IST, EST, PST, GMT, UTC, and more.
Time Duration Converter
Convert between seconds, minutes, hours, days, weeks, months, and years.
Angle Converter
Convert between degrees, radians, gradians, turns, and arcminutes.
📚 Guides & Resources
Understand the systems behind the numbers. Our in-depth guides explain the history, science, and practical tips behind unit conversion.
- Metric vs Imperial: The Complete Guide — History, key differences, and quick conversion tricks
- Cooking Measurements Guide — US cups vs metric cups, tablespoon sizes, and recipe conversion tips
- Data Storage Units Explained — Binary vs decimal, and why your drive shows less space
- Temperature Scales Guide — Celsius, Fahrenheit, and Kelvin: history, formulas, and reference points
- Fuel Efficiency Explained — MPG, km/L, L/100km and tips to improve your mileage
- World Time Zones & DST Guide — How time zones work, DST explained, and scheduling tips
- Pressure Units Explained — From Pascal to PSI: how pressure is measured and converted
- Energy & Power Units Guide — Joules, kWh, Calories, BTU, and understanding your electricity bill
- Understanding Angles — Degrees, radians, and gradians: the maths behind rotation
Why Use UnitSnap?
UnitSnap provides fast, accurate unit conversions with zero distractions. Unlike other converters cluttered with ads and pop-ups, UnitSnap is clean, lightweight, and built for speed.
100% Private
Every conversion happens in your browser. No data is sent to any server. Your inputs never leave your device.
Instant Results
Results update as you type — no need to click a "convert" button. See all common conversions at a glance with our quick reference tables.
Works Everywhere
UnitSnap works on desktop, tablet, and mobile. No app to install, no account to create. Just open and convert.
Accurate & Reliable
All conversion factors are sourced from NIST (National Institute of Standards and Technology) and international measurement standards. Results are precise to 6+ significant digits.