How accurate is this unit converter?

Results are calculated to 10 decimal places using standard conversion factors. For everyday use, this level of precision exceeds what most people need. For scientific or engineering applications requiring extreme precision, always verify with official reference materials.

Can I convert between metric and imperial units?

Yes. The tool supports both systems across all applicable categories. Convert pounds to kilograms, miles to kilometers, gallons to liters, Fahrenheit to Celsius, and more.

Why does the result update automatically?

The converter recalculates in real-time as you type or change selections. This saves you from clicking the button repeatedly. You can still click "Calculate" manually if you prefer.

What's the difference between US gallons and other gallons?

This tool uses US gallons (approximately 3.785 liters). UK/imperial gallons are larger (approximately 4.546 liters). The volume category specifies "Gallon (US)" to avoid confusion.

Is this tool free to use?

Completely free. No sign-up, no limits, no ads interrupting your conversions.

Unit Converter – 12 Categories, 70+ Units, Instant Results

12.01.2026

Converting units shouldn’t require a math degree.

Whether you’re figuring out how many liters are in a gallon, converting Celsius to Fahrenheit for a recipe, or double-checking a measurement for a DIY project, this free unit converter handles it all.

12 categories. 70+ units. Instant results. No sign-up required.

Calculate Now

Unit Conversion Tool

Select Unit Category

Input Value

Input Unit

Output Unit

Result

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TOC

How to Use

Getting your conversion takes about 5 seconds:

Select a category from the dropdown (Length, Mass, Temperature, etc.)
Enter your value in the input field
Choose your input unit (the unit you’re converting from)
Choose your output unit (the unit you’re converting to)
Click “Calculate” — or just wait, it auto-calculates as you type

That’s it. Your result appears instantly below.

Works on any device — desktop, tablet, or phone. The layout adjusts automatically.

Example

Let’s say you need to convert 5 miles to kilometers:

Category: Length
Input Value: 5
Input Unit: Mile (mi)
Output Unit: Kilometer (km)
Result: 5 Mile (mi) = 8.04672 Kilometer (km)

Or converting cooking temperatures:

Category: Temperature
Input Value: 350
Input Unit: Fahrenheit (°F)
Output Unit: Celsius (°C)
Result: 350 Fahrenheit (°F) = 176.6667 Celsius (°C)

Reading Your Results

Your result displays in this format:

[Your Input] [Input Unit] = [Converted Value] [Output Unit]

The converted value is calculated to up to 10 decimal places for precision, but unnecessary zeros are removed for cleaner display. Large numbers include commas for easier reading (e.g., 1,000,000).

Supported Unit Categories

This converter covers 12 measurement types with 70+ individual units:

Length — meters, feet, miles, inches, kilometers, yards, centimeters

Area — square meters, square feet, acres, hectares, square kilometers

Volume — liters, gallons (US), cubic meters, cubic feet, cubic centimeters

Mass — kilograms, pounds, ounces, grams, tons, milligrams

Time — seconds, minutes, hours, days, milliseconds

Temperature — Celsius, Fahrenheit, Kelvin

Pressure — Pascal, bar, atm, psi, hectopascal, kilopascal

Energy — Joules, calories, kilocalories, watt-hours, kilowatt-hours

Power — Watts, kilowatts, horsepower (HP), metric horsepower (PS)

Force — Newtons, kilonewtons, pound-force, kilogram-force, dynes

Acceleration — m/s², ft/s², standard gravity (g), Gal

Angle — degrees, radians, gradians

How Unit Conversion Works

Unit conversion uses a simple principle: every unit in a category can be expressed relative to a base unit.

For example, in the Length category, the base unit is the meter. One kilometer equals 1,000 meters. One inch equals 0.0254 meters. To convert inches to kilometers, the tool first converts inches to meters, then meters to kilometers.

Temperature is the exception — it uses formulas rather than simple multiplication because the scales have different zero points. The tool handles Celsius, Fahrenheit, and Kelvin conversions using the standard conversion formulas.

All conversion factors in this tool follow internationally recognized standards.

FAQ

How accurate is this unit converter?: Results are calculated to 10 decimal places using standard conversion factors. For everyday use, this level of precision exceeds what most people need. For scientific or engineering applications requiring extreme precision, always verify with official reference materials.
Can I convert between metric and imperial units?: Yes. The tool supports both systems across all applicable categories. Convert pounds to kilograms, miles to kilometers, gallons to liters, Fahrenheit to Celsius, and more.
Why does the result update automatically?: The converter recalculates in real-time as you type or change selections. This saves you from clicking the button repeatedly. You can still click “Calculate” manually if you prefer.
What’s the difference between US gallons and other gallons?: This tool uses US gallons (approximately 3.785 liters). UK/imperial gallons are larger (approximately 4.546 liters). The volume category specifies “Gallon (US)” to avoid confusion.
Is this tool free to use?: Completely free. No sign-up, no limits, no ads interrupting your conversions.

Important Notes

This unit converter provides estimates based on standard conversion factors. While highly accurate for general purposes, it should not replace professional-grade measurement tools in contexts where precision is critical (engineering specifications, medical dosing, legal measurements, etc.).

For temperature conversions involving extremely high or low values, standard formulas apply but physical conditions may introduce variables not accounted for here.