This calculator is for informational purposes only and does not constitute medical advice. Results are estimates based on general formulas. Consult a qualified healthcare professional before making health decisions.
Unit Converter
Convert between metric and imperial — length, weight, temperature, speed, volume, and area.
How Unit Conversion Works
Unit conversion works by using a common base unit within each category. For example, all length conversions go through meters, all weight through kilograms. The converter multiplies the input value to the base unit, then divides to the target unit — handling the math instantly.
Quick Reference
- 1 inch = 2.54 centimeters
- 1 foot = 30.48 centimeters
- 1 mile = 1.609 kilometers
- 1 pound = 0.4536 kilograms
- 1 ounce = 28.35 grams
- 100°F = 37.8°C (body temperature)
- 1 gallon = 3.785 liters
Frequently Asked Questions
How do I convert between metric and imperial units?
This converter handles metric ↔ imperial automatically. Common conversions: 1 inch = 2.54 cm, 1 mile = 1.609 km, 1 pound = 0.4536 kg, 1 gallon = 3.785 liters. Simply select your units and the conversion happens instantly.
How do I convert Celsius to Fahrenheit?
Multiply Celsius by 9/5 and add 32. Formula: °F = °C × 9/5 + 32. For example, 100°C = 212°F (boiling point of water). For a quick estimate, double the Celsius and add 30.
What is the difference between mass and weight?
Mass (kilograms) is the amount of matter in an object and doesn't change with location. Weight (newtons) is the force of gravity on that mass and varies by location. In everyday usage, we use "weight" loosely to mean mass. This converter uses mass units.
How many feet are in a mile?
1 mile = 5,280 feet = 1,760 yards = 1,609.344 meters. The mile was originally defined as 1,000 Roman paces (mille passus), but was later standardized to its current length.
What are the most common unit conversions?
The most searched conversions are: kg to lbs, Celsius to Fahrenheit, inches to cm, miles to km, liters to gallons, and feet to meters. All of these are available in this converter with instant, live results.
🔄 Common Conversions
- 1 kg = 2.205 lbs
- 1 mi = 1.609 km
- 1 in = 2.54 cm
- 0°C = 32°F
- 1 gal = 3.785 L
- 1 acre = 4,047 m²
📐 Metric Prefixes
- kilo (k) = 1,000×
- centi (c) = 1/100
- milli (m) = 1/1,000
- micro (μ) = 1/1,000,000