Complete Unit Conversion Guide
Master unit conversions with our comprehensive guide. Learn formulas, see examples, and use our free calculators to convert feet to cm, kg to lbs, celsius to fahrenheit, and more.
Table of Contents
📏 Length Conversions
How to Convert Feet to Centimeters
centimeters = feet × 30.48
The conversion from feet to centimeters is straightforward. Since 1 foot equals exactly 30.48 centimeters, you simply multiply the number of feet by 30.48.
Examples:
5 × 30.48 = 152.4 cm
6 × 30.48 = 182.88 cm
(5 × 30.48) + (6 × 2.54) = 167.64 cm
Common Height Conversions:
| Feet | Centimeters | Use Case |
|---|---|---|
| 4'0" | 121.92 cm | Child height |
| 5'0" | 152.40 cm | Average woman |
| 5'6" | 167.64 cm | Average height |
| 6'0" | 182.88 cm | Average man |
| 7'0" | 213.36 cm | Basketball player |
How to Convert Inches to Centimeters
centimeters = inches × 2.54
Converting inches to centimeters is simple: multiply by 2.54. This conversion is commonly used for screen sizes, measurements, and engineering drawings.
Examples:
10 × 2.54 = 25.4 cm
24 × 2.54 = 60.96 cm
65 × 2.54 = 165.1 cm
How to Convert Meters to Feet
feet = meters × 3.28084
To convert meters to feet, multiply by 3.28084. This is useful for construction, sports measurements, and international comparisons.
Examples:
1 × 3.28084 = 3.28 feet
2 × 3.28084 = 6.56 feet
100 × 3.28084 = 328.08 feet
How to Convert Miles to Kilometers
kilometers = miles × 1.60934
Converting miles to kilometers is essential for international travel, distance measurements, and automotive calculations.
Examples:
1 × 1.60934 = 1.61 km
26.2 × 1.60934 = 42.16 km
100 × 1.60934 = 160.93 km
⚖️ Weight Conversions
How to Convert Kilograms to Pounds
pounds = kilograms × 2.20462
Converting kg to lbs is essential for body weight, shipping weights, and international trade. The conversion factor is 2.20462 pounds per kilogram.
Examples:
50 × 2.20462 = 110.23 lbs
70 × 2.20462 = 154.32 lbs
100 × 2.20462 = 220.46 lbs
Common Weight Conversions:
| Kilograms | Pounds | Use Case |
|---|---|---|
| 50 kg | 110.23 lbs | Light adult weight |
| 70 kg | 154.32 lbs | Average adult weight |
| 80 kg | 176.37 lbs | Heavy adult weight |
| 100 kg | 220.46 lbs | Very heavy weight |
How to Convert Ounces to Grams
grams = ounces × 28.3495
Converting ounces to grams is common in cooking, jewelry, and scientific measurements. The conversion factor is 28.3495 grams per ounce.
Examples:
1 × 28.3495 = 28.35 grams
8 × 28.3495 = 226.80 grams
16 × 28.3495 = 453.59 grams
🌡️ Temperature Conversions
How to Convert Celsius to Fahrenheit
°F = (°C × 9/5) + 32
Converting Celsius to Fahrenheit is essential for weather, cooking, and scientific measurements. The formula involves multiplying by 9/5 and adding 32.
Examples:
(0 × 9/5) + 32 = 32°F
(25 × 9/5) + 32 = 77°F
(100 × 9/5) + 32 = 212°F
Common Temperature Conversions:
| Celsius | Fahrenheit | Description |
|---|---|---|
| -18°C | 0°F | Freezing point |
| 0°C | 32°F | Water freezes |
| 20°C | 68°F | Room temperature |
| 37°C | 98.6°F | Body temperature |
| 100°C | 212°F | Water boils |
How to Convert Fahrenheit to Celsius
°C = (°F - 32) × 5/9
Converting Fahrenheit to Celsius is the reverse process. Subtract 32 from Fahrenheit, then multiply by 5/9.
Examples:
(32 - 32) × 5/9 = 0°C
(77 - 32) × 5/9 = 25°C
(212 - 32) × 5/9 = 100°C
🥤 Volume Conversions
How to Convert Gallons to Liters
liters = gallons × 3.78541
Converting gallons to liters is essential for fuel efficiency, cooking, and international measurements. The conversion factor is 3.78541 liters per gallon.
Examples:
1 × 3.78541 = 3.79 liters
5 × 3.78541 = 18.93 liters
10 × 3.78541 = 37.85 liters
How to Convert Cups to Milliliters
milliliters = cups × 236.588
Converting cups to milliliters is common in cooking and baking. The conversion factor is 236.588 milliliters per US cup.
Examples:
1 × 236.588 = 236.59 ml
2 × 236.588 = 473.18 ml
4 × 236.588 = 946.35 ml
💡 Conversion Tips & Best Practices
Accuracy Matters
Always use precise conversion factors for scientific and engineering applications. Round only for everyday use.
Double-Check Results
Verify your conversions using multiple methods, especially for critical measurements.
Understand Context
Different industries may use slightly different conversion factors. Always check the standard for your field.
Use Technology
Leverage our free online converters for quick and accurate conversions on any device.