Unit Converter - Convert Length, Weight, Temperature Online Free

How to Use the Unit Converter

1. Select a category — choose from length, weight (mass), temperature, area, or volume. Each category has its own set of supported units.
2. Enter a value — type a number into any unit field within the selected category. All other units in that category update automatically to show the equivalent value.
3. Read the results — every supported unit for that category displays instantly. No need to select a “from” and “to” — just type any value and see all conversions at once.
4. Copy any result — click on any converted value to copy it to your clipboard for use elsewhere.
5. Switch categories — click a different category tab to start a new conversion without losing your previous results.

All calculations are done in your browser. No data is sent anywhere — your conversions are completely private.

Features

• Multiple categories — length, weight, temperature, area, and volume all in one tool
• Instant conversion — results update in real time as you type
• All-at-once display — see values in every unit simultaneously, no need for separate to/from selection
• Temperature support — Celsius, Fahrenheit, and Kelvin with accurate formulas
• Length units — meters, kilometers, miles, feet, inches, centimeters, millimeters, yards
• Weight units — kilograms, grams, pounds, ounces, tons, milligrams
• Area and volume — square meters, acres, hectares, liters, gallons, and more

Use Cases

• Cooking & baking — convert between metric and imperial measurements when following recipes from different countries
• DIY & home improvement — switch between feet/inches and meters when measuring rooms, furniture, or building materials
• Travel — understand speed limits, distances, and temperatures when visiting countries that use different measurement systems
• Academics — solve physics, chemistry, and math problems that require unit conversions
• Shipping & logistics — calculate weight and dimension conversions for international shipping documents

FAQ

How many units are supported per category?

Length and weight each include 10+ units. Temperature supports 3 units (Celsius, Fahrenheit, Kelvin). Area and volume include common metric and imperial units covering home, construction, and scientific use.

Is the conversion accurate?

Yes. All conversion factors use standard international definitions. Temperature conversions use the exact mathematical formulas, and all other conversions use precise conversion factors.

Can I convert between categories, like length to volume?

No — each category is independent. Converting length to volume requires knowing additional dimensions (like width and height). This tool converts within each category only.

Is this tool free to use?

Absolutely. The unit converter is 100% free with no sign-up required, no usage limits, and no ads interfering with your conversions.

Tips

• Type the value in any unit — you don’t have to clear the field first. Just start typing and all values update
• Use the category tabs to quickly switch between measurement types without reloading the page
• For approximate mental conversions, remember: 1 inch ≈ 2.54 cm, 1 kg ≈ 2.2 lbs, and to convert Celsius to Fahrenheit, multiply by 1.8 and add 32