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Student & Academic · Cheatsheet

Everyday Unit Conversions Cheatsheet

Convert length, area, volume, mass, time, and temperature. Use exact metric and US customary factors with clear unit definitions and examples.

37 commands 7 sections

Choose the correct unit

  • Match the quantity Length, area, volume, and mass need different factors
  • US customary units The gallon and fluid ounce below use US liquid definitions
  • Mass is not volume Convert between grams and milliliters only with a known density
  • Exact versus rounded Equal signs below show exact factors; ≈ marks a rounded result

Metric prefixes and length

  • 1 km = 1000 m Convert kilometers to meters
  • 1 m = 100 cm Convert meters to centimeters
  • 1 cm = 10 mm Convert centimeters to millimeters
  • 1 kg = 1000 g Convert kilograms to grams
  • 1 g = 1000 mg Convert grams to milligrams
  • 1 L = 1000 mL Convert liters to milliliters

US customary length

  • 1 in = 2.54 cm The international inch uses this exact definition
  • 1 ft = 0.3048 m The international foot equals 12 inches
  • 1 yd = 0.9144 m One yard equals 3 feet
  • 1 mi = 1.609344 km One international mile equals 5280 feet
  • 5 ft 6 in = 167.64 cm Calculate (5 × 12 + 6) × 2.54

Area and volume

  • 1 m² = 10,000 cm² Square the length conversion factor
  • 1 km² = 1,000,000 m² Square 1000 to convert the area
  • 1 hectare = 10,000 m² A hectare measures area
  • 1 m³ = 1000 L Cube the length factor before converting volume
  • 1 cm³ = 1 mL A cubic centimeter equals a milliliter
  • 1 US gal = 3.785411784 L Use the US liquid gallon, not the imperial gallon
  • 1 US fl oz = 29.5735295625 mL A fluid ounce measures volume, not mass

Mass and time

  • 1 lb = 0.45359237 kg Use the international avoirdupois pound
  • 1 oz = 28.349523125 g Use the avoirdupois mass ounce, not the troy ounce
  • 1 lb = 16 oz This relation uses avoirdupois mass units
  • 1 minute = 60 seconds Convert minutes to seconds
  • 1 hour = 60 minutes Convert hours to minutes
  • 2.5 hours = 2 hours 30 minutes Multiply the decimal part by 60

Temperature

  • °F = °C × 9/5 + 32 Convert a Celsius temperature to Fahrenheit
  • °C = (°F - 32) × 5/9 Convert a Fahrenheit temperature to Celsius
  • K = °C + 273.15 Convert Celsius to kelvin; kelvin has no degree symbol
  • 20 °C = 68 °F = 293.15 K Apply the formulas to the same temperature
  • A change of 1 °C = a change of 1.8 °F Temperature differences do not use the 32-degree offset

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