What unit categories are supported?

The converter supports length (meters, feet, inches, miles, kilometers, yards, nautical miles, light-years), weight/mass (kilograms, pounds, ounces, grams, tonnes, stones), temperature (Celsius, Fahrenheit, Kelvin), volume (liters, gallons, fluid ounces, cups, milliliters, cubic meters), area (square meters, square feet, acres, hectares), speed (km/h, mph, m/s, knots), time (seconds, minutes, hours, days, weeks), and digital storage (bytes, KB, MB, GB, TB). New categories are added regularly.

How accurate are the conversions?

All conversions use standard exact or high-precision conversion factors defined by the International System of Units (SI) and US customary definitions. For example, 1 inch is exactly 25.4 millimeters (by international definition since 1959), and 1 pound-force is exactly 0.45359237 kilograms. Temperature conversions (Celsius, Fahrenheit, Kelvin) use exact formulas. The precision shown is limited to avoid displaying unnecessary decimal places, but the underlying calculations use full floating-point precision.

How do I convert Celsius to Fahrenheit?

The exact formula is: °F = (°C × 9/5) + 32. To convert Fahrenheit to Celsius: °C = (°F - 32) × 5/9. Some useful reference points: 0°C = 32°F (water freezes), 100°C = 212°F (water boils), 37°C = 98.6°F (body temperature), 20°C = 68°F (comfortable room temperature). A quick mental approximation: double the Celsius temperature and add 30 (e.g., 20°C ≈ 2×20+30 = 70°F, actual is 68°F — close enough for everyday use).

Why do metric and imperial systems both exist?

The metric system (SI) was developed in France in the 1790s and is now used by approximately 95% of the world's countries as the official system of measurement. The United States, along with Liberia and Myanmar, primarily uses the imperial/US customary system in everyday life, though science and medicine worldwide use metric. The coexistence of systems creates conversion challenges in international trade, engineering, cooking, and travel — which is exactly why unit converters are so frequently needed.

Unit Converter

Convert between units of measurement instantly.

From

3.2808

1 Meters = 3.2808 Feet

All Conversions

1,000

Millimeters

100

Centimeters

0.001

Kilometers

39.3701

Inches

3.2808

Feet

1.0936

Yards

0.00062137

Miles

Free Online Unit Converter

Convert between units of length, weight, temperature, volume, area, speed, time, and more — instantly and free. Our comprehensive unit converter covers all the everyday conversions you need: meters to feet, kilometers to miles, kilograms to pounds, Celsius to Fahrenheit, liters to gallons, and hundreds of other combinations across all major measurement systems (metric/SI, imperial/US customary, and others). Each conversion uses precise mathematical factors, not approximations, ensuring accuracy for engineering, scientific, cooking, fitness, travel, and academic use cases. Converting units correctly is essential in everyday life — mismatched measurement systems cause errors in cooking recipes, fitness tracking, international travel, construction projects, and scientific calculations. The tool updates instantly as you type, so you can see all equivalent values simultaneously without repeated clicking.

How to Use

Select a measurement category (length, weight, temperature, etc.).
Choose the unit to convert from and enter a value.
Choose the unit to convert to — the result updates instantly.
Click any unit card in "All Conversions" to quickly switch the target unit.

FAQ

What unit categories are supported?: The converter supports length (meters, feet, inches, miles, kilometers, yards, nautical miles, light-years), weight/mass (kilograms, pounds, ounces, grams, tonnes, stones), temperature (Celsius, Fahrenheit, Kelvin), volume (liters, gallons, fluid ounces, cups, milliliters, cubic meters), area (square meters, square feet, acres, hectares), speed (km/h, mph, m/s, knots), time (seconds, minutes, hours, days, weeks), and digital storage (bytes, KB, MB, GB, TB). New categories are added regularly.
How accurate are the conversions?: All conversions use standard exact or high-precision conversion factors defined by the International System of Units (SI) and US customary definitions. For example, 1 inch is exactly 25.4 millimeters (by international definition since 1959), and 1 pound-force is exactly 0.45359237 kilograms. Temperature conversions (Celsius, Fahrenheit, Kelvin) use exact formulas. The precision shown is limited to avoid displaying unnecessary decimal places, but the underlying calculations use full floating-point precision.
How do I convert Celsius to Fahrenheit?: The exact formula is: °F = (°C × 9/5) + 32. To convert Fahrenheit to Celsius: °C = (°F - 32) × 5/9. Some useful reference points: 0°C = 32°F (water freezes), 100°C = 212°F (water boils), 37°C = 98.6°F (body temperature), 20°C = 68°F (comfortable room temperature). A quick mental approximation: double the Celsius temperature and add 30 (e.g., 20°C ≈ 2×20+30 = 70°F, actual is 68°F — close enough for everyday use).
Why do metric and imperial systems both exist?: The metric system (SI) was developed in France in the 1790s and is now used by approximately 95% of the world's countries as the official system of measurement. The United States, along with Liberia and Myanmar, primarily uses the imperial/US customary system in everyday life, though science and medicine worldwide use metric. The coexistence of systems creates conversion challenges in international trade, engineering, cooking, and travel — which is exactly why unit converters are so frequently needed.

Unit Converter

All Conversions

Free Online Unit Converter

How to Use

FAQ

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