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Tools by ASFIT Solutions
Unit Converter Online
Use this free Unit Converter to convert common measurement units such as length, weight, temperature, area, volume, speed, time, power, and more. It is useful for students, engineers, technicians, travelers, cooking, shopping, construction, and daily calculations.
Quick Answer: What Is a Unit Converter?
A unit converter is a tool that changes a value from one measurement unit to another, such as inches to centimeters, kilograms to pounds, Celsius to Fahrenheit, or BTU to kW. It helps users compare measurements quickly without doing manual formulas.
All-in-One Unit Converter
Choose a category, enter a value, and convert between common measurement units instantly.
Try a Sample Conversion
Use a common example without leaving the converter.
Recent History
Your latest conversions appear here as soon as you convert or use a sample.
Convert to All Units
See the selected value converted from your from unit to all other units in the same category.
| Unit | Result | Formula | Copy |
|---|---|---|---|
| Enter a value to see all related conversions. | |||
Conversion History
Your latest conversions from this page session appear here.
| Conversion | Category | Time |
|---|---|---|
| Your conversion history will appear here after you convert a value. | ||
How to Use This Unit Converter
1. Select a category
Select the conversion category such as length, weight, temperature, area, or volume.
2. Enter a value
Type the measurement value you want to convert.
3. Choose from unit
Choose the unit you are converting from.
4. Choose to unit
Choose the unit you want to convert to.
5. Convert or view instantly
Click Convert or review the instant result as you update fields.
6. Swap or copy
Use Swap Units to reverse the conversion or copy the final result.
What Can You Convert?
This measurement converter supports the categories available in the tool above.
- Length: inches, feet, meters, centimeters, kilometers, yards, and miles.
- Weight / Mass: grams, kilograms, ounces, pounds, metric tons, and stone.
- Temperature: Celsius, Fahrenheit, and Kelvin.
- Area: square meters, square feet, acres, hectares, and more.
- Volume: liters, milliliters, cups, cubic units, and US or UK gallons.
- Speed: km/h, mph, m/s, knots, and feet per second.
- Time and data: seconds to years, bits, bytes, KB, MB, GB, and binary units.
- Power and energy: watts, kilowatts, BTU per hour, joules, calories, and kWh.
- More categories: pressure, angle, fuel economy, force, frequency, and land area.
Common Unit Conversion Examples
| Conversion | Common Use | Example |
|---|---|---|
| Inches to centimeters | Height, product size, screen size | 1 inch = 2.54 cm |
| Kilograms to pounds | Body weight, shipping, fitness | 1 kg ≈ 2.20462 lb |
| Celsius to Fahrenheit | Weather, cooking, temperature | °F = °C × 9/5 + 32 |
| Liters to gallons | Fuel and liquid volume | 1 liter ≈ 0.264172 US gal |
| Square feet to square meters | Rooms, property, construction | 1 sq ft ≈ 0.092903 sq m |
| BTU to kW | Heating, cooling, and power | 1 BTU/h ≈ 0.000293071 kW |
Popular Conversion Categories
Length Converter
Convert inches, centimeters, feet, meters, kilometers, and miles.
Weight Converter
Convert kilograms, pounds, grams, ounces, metric tons, and stone.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin with the correct formulas.
Area Converter
Convert square feet, square meters, acres, hectares, and land units.
Volume Converter
Convert liters, milliliters, gallons, cups, and cubic units.
Speed Converter
Convert kilometers per hour, miles per hour, meters per second, and knots.
Time Converter
Convert seconds, minutes, hours, days, weeks, months, and years.
Power Converter
Convert watts, kilowatts, horsepower, and BTU per hour.
Energy Converter
Convert joules, kilojoules, calories, watt-hours, and kilowatt-hours.
Unit Converter Best Practices
- Select the correct category before converting.
- Check whether volume units are US or UK units.
- Use enough decimal places for precise work.
- Verify critical engineering or medical calculations.
- Be careful with temperature formulas.
- Use consistent units in formulas.
- Do not mix metric and imperial units without converting.
- Recheck values before using them in professional work.
This Unit Converter is designed for quick everyday conversions. For engineering, medical, legal, scientific, financial, or safety-critical work, verify results with an official reference or professional tool.
Related Utility Tools
Explore more ASFIT Tools utilities with the same fast, browser-friendly design.
Unit Converter FAQs
A unit converter changes a value from one measurement unit to another, such as inches to centimeters or kilograms to pounds.
Choose a category, enter a number, select the from and to units, and the tool calculates the converted result in your browser.
Yes. ASFIT Tools Unit Converter is free to use and does not require sign-up.
Yes. You can convert common length units such as millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Yes. You can convert weight and mass units such as grams, kilograms, metric tons, ounces, pounds, and stone.
Yes. The tool converts Celsius, Fahrenheit, and Kelvin using proper temperature formulas.
Metric units include meters, grams, liters, and Celsius. Imperial and US customary units include inches, feet, pounds, gallons, and Fahrenheit.
Yes. Select Temperature, choose Celsius as the from unit, Fahrenheit as the to unit, and enter your value.
Yes. Select Weight / Mass, choose kilogram and pound, then enter the value to convert.
Yes. Select Length, choose inch and centimeter, then enter the value.
Yes. In the Power category, BTU per hour can be converted to watts or kilowatts.
No. This page does not provide live currency conversion because exchange rates change and require current financial data.
Many standard conversions are exact, but some practical units can be approximate. Verify critical calculations with an official reference.
Use it for quick everyday conversions. For engineering, medical, legal, scientific, financial, or safety-critical work, verify results with a professional tool.