Free Unit Converter
Instantly convert between metric and imperial units — no login, no nonsense.
📏 Length Converter
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Common Unit Conversions — Instant Answers
Below are the most frequently searched unit conversions. Bookmark this page for quick reference.
📏 Kilometers → Miles
⚖️ Kilograms → Pounds
⚖️ Pounds → Kilograms
🌡️ Celsius → Fahrenheit
📏 Centimeters → Inches
💧 Liters → Gallons (US)
🚀 km/h → mph
📏 Meters → Feet
About MultiConvert
MultiConvert is a free, fast, and accurate unit converter for the most common everyday conversions between metric and imperial systems. Whether you need to convert kilometers to miles for a road trip, kilograms to pounds for fitness tracking, or Celsius to Fahrenheit for travel planning — everything is handled instantly in your browser with no data sent to a server.
We currently support 6 conversion categories: length, weight, temperature, volume, speed, and area, covering over 50 units. More categories are on the way.
Length Conversion Guide
The metric system uses meters (m) as its base unit for length. Common metric units include millimeters (mm), centimeters (cm), meters (m), and kilometers (km). The imperial system uses inches, feet, yards, and miles. The key relationships to remember:
1 inch = 2.54 cm · 1 foot = 30.48 cm · 1 mile = 1.609 km · 1 meter = 3.281 feet
For everyday use: a standard door is about 2 meters (6.6 ft) tall, a marathon is 42.195 km (26.22 miles), and a football field is roughly 91 meters (100 yards) long.
Weight & Mass Conversion Guide
The metric unit of mass is the kilogram (kg). One kilogram equals 2.2046 pounds. For smaller measurements, 1 kg = 1,000 grams (g). In the imperial system, 1 pound = 16 ounces, and 1 stone (used in the UK) = 14 pounds = 6.35 kg.
Common real-world references: an average adult weighs around 70 kg (154 lbs), a bag of sugar is 1 kg (2.2 lbs), and a US nickel coin weighs exactly 5 grams.
Temperature Conversion Guide
The two most common temperature scales are Celsius (°C), used in most of the world, and Fahrenheit (°F), primarily used in the United States. The formulas are:
°F = (°C × 9/5) + 32 | °C = (°F − 32) × 5/9
Key reference points: water freezes at 0 °C / 32 °F, normal body temperature is 37 °C / 98.6 °F, and water boils at 100 °C / 212 °F. A comfortable room temperature is around 20–22 °C (68–72 °F).
Speed Conversion Guide
Speed is commonly expressed in kilometers per hour (km/h) in metric countries, or miles per hour (mph) in the US and UK. 1 mph = 1.60934 km/h, so a 60 mph speed limit is approximately 97 km/h. In science, speed is often measured in meters per second (m/s): 1 m/s = 3.6 km/h.
Quick reference: highway speed of 100 km/h = 62.1 mph · sound travels at ~343 m/s (1,235 km/h) · a fast sprinter runs about 10 m/s (36 km/h).
Frequently Asked Questions
- How many kilometers in a mile?
- 1 mile = 1.60934 kilometers. Conversely, 1 kilometer = 0.62137 miles. So a 5K race is about 3.1 miles.
- How do I convert kg to lbs?
- Multiply kilograms by 2.20462 to get pounds. For example, 70 kg × 2.20462 = 154.3 lbs. To go from lbs to kg, divide by 2.20462 (or multiply by 0.4536).
- What is 100°F in Celsius?
- 100 °F = 37.78 °C. Use the formula: °C = (100 − 32) × 5/9 = 68 × 0.5556 = 37.78.
- How many liters in a gallon?
- 1 US gallon = 3.78541 liters. 1 liter = 0.26417 US gallons. Note: the UK imperial gallon is slightly larger at 4.54609 liters.
- How many feet in a meter?
- 1 meter = 3.28084 feet (or 3 feet 3.37 inches). 1 foot = 0.3048 meters exactly.
- Is this converter accurate?
- Yes. All conversions use internationally recognized exact or high-precision factors and are calculated in real time in your browser. No rounding occurs until the result is displayed.