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Unit Conversion Cheat Sheet: Essential Conversions You Need to Know

A quick-reference guide for the most common unit conversions across length, weight, volume, temperature, area, speed, and digital storage measurements.

February 4, 2026by Useful Tools TeamDeveloper

Unit Conversion Cheat Sheet: Essential Conversions You Need to Know

Whether you are cooking with a recipe from another country, working on an international project, or helping a child with homework, unit conversions come up constantly. This guide covers the most useful conversions you are likely to need, organized by category.

Length and Distance

Metric to Imperial

  • 1 centimeter = 0.394 inches
  • 1 meter = 3.281 feet = 1.094 yards
  • 1 kilometer = 0.621 miles

Imperial to Metric

  • 1 inch = 2.54 centimeters
  • 1 foot = 30.48 centimeters = 0.305 meters
  • 1 yard = 0.914 meters
  • 1 mile = 1.609 kilometers

Quick Mental Math

  • Kilometers to miles — multiply by 0.6 (or more precisely, multiply by 5 and divide by 8)
  • Miles to kilometers — multiply by 1.6
  • Inches to centimeters — multiply by 2.5

Use our Unit Converter for precise conversions between any units of measurement.

Weight and Mass

Metric to Imperial

  • 1 gram = 0.035 ounces
  • 1 kilogram = 2.205 pounds
  • 1 metric ton = 2,205 pounds

Imperial to Metric

  • 1 ounce = 28.35 grams
  • 1 pound = 453.6 grams = 0.454 kilograms
  • 1 stone = 6.35 kilograms (used in the UK)

Quick Mental Math

  • Kilograms to pounds — multiply by 2.2
  • Pounds to kilograms — divide by 2.2 (or multiply by 0.45)

Volume and Capacity

Metric

  • 1 liter = 1,000 milliliters
  • 1 milliliter = 1 cubic centimeter

Metric to Imperial

  • 1 liter = 0.264 US gallons = 0.220 Imperial gallons
  • 1 liter = 33.814 US fluid ounces
  • 1 liter = 4.227 US cups

Imperial to Metric

  • 1 US gallon = 3.785 liters
  • 1 Imperial gallon = 4.546 liters
  • 1 US cup = 236.6 milliliters
  • 1 US fluid ounce = 29.57 milliliters

Cooking Conversions

  • 1 tablespoon = 3 teaspoons = 15 milliliters
  • 1 cup = 16 tablespoons = 237 milliliters
  • 1 pint = 2 cups = 473 milliliters
  • 1 quart = 4 cups = 946 milliliters

Temperature

Formulas

  • Celsius to Fahrenheit — multiply by 9/5, then add 32
  • Fahrenheit to Celsius — subtract 32, then multiply by 5/9

Key Reference Points

  • Water freezes: 0°C = 32°F
  • Room temperature: 20-22°C = 68-72°F
  • Body temperature: 37°C = 98.6°F
  • Water boils: 100°C = 212°F

Quick Mental Math

  • Celsius to Fahrenheit — double the Celsius value and add 30 (approximate but useful)
  • Fahrenheit to Celsius — subtract 30 and divide by 2 (approximate)

Area

  • 1 square meter = 10.764 square feet
  • 1 square foot = 0.093 square meters
  • 1 acre = 43,560 square feet = 4,047 square meters
  • 1 hectare = 2.471 acres = 10,000 square meters

Speed

  • 1 kilometer per hour = 0.621 miles per hour
  • 1 mile per hour = 1.609 kilometers per hour
  • 1 knot = 1.151 miles per hour = 1.852 kilometers per hour

Data Storage

  • 1 kilobyte (KB) = 1,024 bytes
  • 1 megabyte (MB) = 1,024 KB
  • 1 gigabyte (GB) = 1,024 MB
  • 1 terabyte (TB) = 1,024 GB

Tips for Remembering Conversions

Rather than memorizing every conversion factor, remember these anchor points:

  • A meter is slightly longer than a yard — about 10% more
  • A kilogram is about 2.2 pounds — slightly more than double
  • A liter is slightly more than a quart — about 5% more
  • A kilometer is about 60% of a mile — think 5 km is roughly 3 miles

For precise calculations every time, use our Unit Converter. It handles all unit types and gives you exact results instantly, eliminating rounding errors and conversion mistakes.