Metric:
Distance: Centimeters (cm), Meters (m), Kilometers (km)
Weight: Milligrams (mg), Grams (g), Kilograms (kg)
Volume: Milliliters (mL), Liters (L)
Customary:
Distance: Inches (in), Feet (ft), Yards (yd), Miles (mi)
Weight: Ounces (oz), Pounds (lbs), Tons (T)
Volume: Cups (c), Pints (pt), Quarts (qt), Gallons (gal)