What is UnitToolbox used for?

UnitToolbox is a free online tool that helps you quickly convert units like meters to feet, Celsius to Fahrenheit, or kilograms to pounds. It’s ideal for students, engineers, DIYers, and everyday users.

Is UnitToolbox free to use?

Yes! UnitToolbox is 100% free, with no logins or subscriptions required. Just open the site and convert any unit instantly.

Does UnitToolbox work on mobile phones?

Absolutely. The site is fully mobile-optimized, so you can convert units on your phone, tablet, or desktop with ease.

Universal Unit Converter

Welcome to UnitToolbox – your fast and easy online unit converter. Instantly convert any unit of length, weight, volume, temperature, area, and more. Whether you're working on homework, engineering, cooking, or planning a DIY project, our simple tool gives you accurate results in seconds.

Base value: Base unit:

Converted value: Converted unit:

Common Unit Converters

📏 Length Converter Convert meters, centimeters, feet, inches, and more. ⚖️ Weight & Mass Converter Quickly convert kilograms, grams, pounds, ounces, and tons. 🧪 Volume Converter Convert liters, milliliters, gallons, cups, and other volume units. 🌡️ Temperature Converter Switch between Celsius, Fahrenheit, Kelvin, and more. 📐 Area Converter Convert square meters, acres, hectares, and other area units. ⏱️ Time Converter Convert seconds, minutes, hours, days, weeks, months, and years.

Astronomy Calculators

🌟 Light Travel Time Calculate how long light takes to travel astronomical distances. 📐 Angular Size Determine how large objects appear in the sky. 🔭 Field of View Calculate telescope or camera field of view coverage. 📷 Pixel Scale Find arcseconds per pixel for astrophotography. 🔍 Telescope Magnification Calculate telescope magnification from focal lengths. 🌙 Moon Phase Calculator Calculate moon phases for any date and location.

Quick Conversion Links

Quick links to the most searched unit conversions like kg to lbs, cm to inches, Fahrenheit to Celsius, and more.

📏 cm to inches Convert centimeters to inches instantly. 📏 inches to cm Convert inches to centimeters. ⚖️ kg to lbs Convert kilograms to pounds fast. ⚖️ lbs to kg Convert pounds to kilograms. 🌡️ Celsius to Fahrenheit Switch Celsius to Fahrenheit. 🌡️ Fahrenheit to Celsius Convert Fahrenheit to Celsius. 📏 mm to inches Convert millimeters to inches easily. 📏 inches to mm Convert inches to millimeters. 📏 meters to feet Convert meters to feet quickly. 📏 feet to meters Convert feet to meters fast. 🛣️ km to miles Convert kilometers to miles in one click. 🛣️ miles to km Convert miles to kilometers. 📏 cm to feet Convert centimeters to feet. 📏 feet to cm Convert feet to centimeters. ⚖️ grams to ounces Convert grams to ounces easily. ⚖️ ounces to grams Convert ounces to grams easily. 📏 inches to feet Convert inches to feet accurately. 📏 feet to inches Convert feet to inches instantly. 🧪 liters to gallons Convert liters to gallons fast. 🧪 gallons to liters Convert gallons to liters. ⚖️ pounds to ounces Convert pounds to ounces quickly. ⚖️ ounces to pounds Convert ounces to pounds. 🚗 mph to kph Convert miles per hour to km/h. 🚗 kph to mph Convert kilometers per hour to mph. 📐 acres to sq ft Convert acres to square feet. 📐 sq ft to acres Convert square feet to acres. 📐 radians to degrees Convert radians to degrees. 📐 degrees to radians Convert degrees to radians. 🔧 hp to kW Convert horsepower to kilowatts. 🔧 kW to hp Convert kilowatts to horsepower. 📏 meters to yards Convert meters to yards. 📏 yards to meters Convert yards to meters. 🥛 ml to cups Convert milliliters to cups. 🥛 cups to ml Convert cups to milliliters.

Why Users Love UnitToolbox?

⚡ Fast, accurate conversions
📱 Works on any device
🔒 No logins, no tracking
💡 Easy-to-understand results with explanations

Meet the Creator

UnitToolbox was built by Paweł Białecki, an indie iOS and web developer with 10+ years of experience and over 3 million app downloads. Learn more → About UnitToolbox

Two-way arrow icon representing fast and simple unit conversions at UnitToolbox — The official icon of UnitToolbox – a fast, accurate, and mobile-friendly unit converter created by Astro Photons Apps.

FAQ

What is UnitToolbox used for?

UnitToolbox is a free online tool that helps you quickly convert units like meters to feet, Celsius to Fahrenheit, or kilograms to pounds. It’s ideal for students, engineers, DIYers, and everyday users.
Is UnitToolbox free to use?

Yes! UnitToolbox is 100% free, with no logins or subscriptions required. Just open the site and convert any unit instantly.
Does UnitToolbox work on mobile phones?

Absolutely. The site is fully mobile-optimized, so you can convert units on your phone, tablet, or desktop with ease.