Unit Converter

Conversion results are provided for general information only. For precise applications — in medicine, engineering or aviation — always verify with authoritative sources.

✅ Quick Answer: How do I convert units?

Most common conversions:

  • 1 inch = 2.54 cm  |  1 foot = 30.48 cm
  • 1 kg = 2.2046 lb  |  1 lb = 0.4536 kg
  • °F = (°C × 9/5) + 32  |  °C = (°F − 32) × 5/9
  • 1 km/h = 0.2778 m/s  |  1 mile = 1.609 km
  • 1 GB = 1,024 MB  |  1 psi = 0.06895 bar

💡 Tip: Select a category below, enter your value, and see every conversion instantly — click any row to copy.

Basic Physics
Geometry & Mechanics
Electricity & Magnetism
Optics & Radiation
Thermodynamics & Heat
Fluid Mechanics
Science & Engineering

Popular Conversions at a Glance

Length & Distance

The most common conversions are between meters, centimeters, feet and inches. Keep these in mind: 1 meter = 100 centimeters ≈ 3.28 feet ≈ 39.37 inches. For everyday use, 1 inch = 2.54 cm and 1 foot = 30.48 cm. Our converter covers every SI and imperial unit — from millimeters and kilometers to miles and yards — with exact decimal-precise results.

Weight & Mass

Cooking and fitness make weight one of the most-used categories. The essentials: 1 kilogram = 1000 grams ≈ 2.2046 pounds, and 1 pound = 16 ounces ≈ 453.6 grams. For smaller quantities, 1 ounce ≈ 28.35 grams. Whether you need tons for freight, stones for body weight or micrograms for supplements, the converter handles them all instantly.

Temperature

Temperature is the trickiest category because it uses offset scales rather than simple multipliers. Two formulas are worth memorizing: °F = (°C × 9/5) + 32, and °C = (°F − 32) × 5/9. Handy reference points: 0°C = 32°F (freezing), 20–22°C ≈ 68–72°F (room comfort), 37°C = 98.6°F (body temperature), and 100°C = 212°F (boiling). Kelvin is included for scientific work.

Quick start:
💡 Results update as you type — click any result row to copy a conversion.
Values are rounded for display. Click any row to copy the conversion.

Unit Conversion FAQ

How many centimeters are in a meter?

1 meter (m) equals exactly 100 centimeters (cm). To convert meters to centimeters, simply multiply the number of meters by 100.

How do I convert kilograms to pounds?

1 kilogram (kg) equals approximately 2.20462 pounds (lb). Multiply the weight in kilograms by 2.20462 to get pounds.

How many liters are in a gallon?

1 US gallon equals 3.78541 liters (L). For UK (imperial) gallons, 1 gallon equals 4.54609 liters.

How do I convert Celsius to Fahrenheit?

To convert Celsius (°C) to Fahrenheit (°F), use the formula: °F = (°C × 9/5) + 32. For example, 100°C = 212°F.

How do I convert km/h to m/s?

1 kilometer per hour (km/h) equals 0.277778 meters per second (m/s). Divide the speed in km/h by 3.6 to get m/s.

How many seconds are in an hour?

1 hour equals 3,600 seconds (s). For days, 1 day equals 86,400 seconds.

How do I convert psi to bar?

1 psi equals approximately 0.068948 bar. Divide the pressure in psi by 14.5038 to get bar.

How many MB are in a GB?

In binary terms, 1 gigabyte (GB) equals 1,024 megabytes (MB). Convert GB to MB by multiplying by 1,024.

How many inches are in a foot?

There are exactly 12 inches in 1 foot. To convert feet to inches, multiply the number of feet by 12. For example, 5 feet = 60 inches.

How do I convert miles to kilometers?

1 mile equals approximately 1.60934 kilometers. Multiply the distance in miles by 1.60934 to get kilometers. For example, 10 miles ≈ 16.09 km.

How do I convert inches to centimeters?

1 inch equals exactly 2.54 centimeters. Multiply the length in inches by 2.54 to get centimeters. For example, 12 inches = 30.48 cm.

What is the difference between US and UK gallons?

A US gallon equals 3.78541 liters, while a UK (imperial) gallon equals 4.54609 liters. One UK gallon is about 20% larger than a US gallon.

Fengvi Unit Converter - Instantly Convert Between 61 Unit Categories

Fengvi Tools provides a free, comprehensive unit converter covering 61 categories — from basic measurements like length, weight, time, temperature and speed to advanced fields like torque, electric and magnetic quantities, optics and radiation, thermodynamics, fluid mechanics and more. Convert meters to centimeters, km/h to m/s, psi to bar, GB to MB and hundreds of other conversions instantly and accurately.

Key Features of Our Unit Converter

  • 61 categories covering everyday and professional measurements
  • Support for SI and imperial units with precise conversion factors
  • Instant conversion as you type, no clicking required
  • Available in 11 languages: English, Chinese, Japanese, Korean, Spanish, Italian, Russian, German, French, Portuguese and Arabic
  • Mobile-friendly design that works on any device
  • No registration required - completely free to use

Popular Unit Conversions

Quickly convert between common units:

  • 1 cm to inches - Length conversion
  • 1 kg to lbs - Weight conversion
  • 100°C to °F - Temperature conversion
  • 100 km/h to m/s - Speed conversion
  • 1 psi to bar - Pressure conversion
  • 1 GB to MB - Data storage conversion

Whether you are a student, engineer, traveler or just need a quick everyday conversion, our free unit converter gives you accurate results in seconds — with no downloads and no registration required.