Here are useful units of measure to know

Length
Metric System		English System
1 liter (L)	= 1000 milliliters (mL)	1 tablespoon (tbsp)	= 3 teaspoon (tsp)
		1 fluid ounce (fl oz)	= 2 tablespoon (tbsp)
		1 cup (c)	= 8 fluid ounces (fl oz)
		1 pint (pt)	= 2 cups (c)
		1 quart (qt)	= 2 pints (pt)
		1 gallon (gal)	= 4 quarts (qt)
	1 liter (L)	= 202.9 teaspoon (tsp)

Example 1: Unit conversion (English system)

Do the following conversions. Round to nearest tenth where necessary.
48 fl oz = cup

We know that 1 cup (c) = 12 fluid ounces (fl oz) so

48 fl oz × = × =  4 cup

So, 48 fl oz = cup

Example 2: Unit conversion (metric system)

Do the following conversions. Round to nearest tenth where necessary.
7 L = mL

We know that 1 liter (L) = 1000 milliliters (mL) so

7 L × = × =  7000 mL

So, 7 L = mL