The main distinction between the imperial system and the US measurement rates is in volume. The number of ounces in pints, quarts or gallons are larger in the imperial system. Also, the size of one fluid ounce is distinct, as it follows:
1 fl ounce (US) = 29.57 ml
1 fl ounce (imperial) = 28.41 ml
Fluid unce (US) is bigger than imperial fluid ounce.
When you need to convert between units in the Imperial and the US Systems, you will have to know the equivalents for each of the units:
| Types of Measurement | Conversion | |||
|---|---|---|---|---|
| Weight | 1 pound | 16 ounces | ||
| Volume (US) | 1 gallon | 4 quarts | 8 pints | 128 fl. ounces |
| 1 quart | 2 pints | 4 cups | 32 fl. ounces | |
| 1 pint | 2 cups | 16 fl. ounces | ||
| 1 cup | 16 tablespoons | 8 fl. ounces | ||
| 1 fl. ounce | 2 tablespoons | |||
| 1 tablespoon | 3 teaspoons | |||
| Volume (imperial) | 1 gallon | 4 quarts | 160 fl. ounces | |
| 1 quart | 2 pints | 40 fl. ounces | ||
| 1 pint | 4 gill | 20 fl. ounces | ||
| 1 gill | 10 tablespoons | 5 fl. ounces | ||
| 1 fl. ounce | 2 tablespoons | |||
| 1 tablespoon | 3 teaspoons | |||
| Length | 1 mile | 1760 yards | 5280 feet | |
| 1 yard | 3 feet | 36 inch | ||
| 1 foot | 12 inches | |||
When it comes to cooking, you will most likely need soft conversions to transform ounces to spoons, pounds to ounces or gallons to cups. The most common soft conversions include:
Metric to US Measurements
| 1 milliliter | → | 1/4 teaspoon |
| 2 milliliters | → | 1/2 teaspoon |
| 5 milliliters | → | 1 teaspoon |
| 15 milliliters | → | 1 tablespoon |
| 30 milliliters | → | 1 fluid ounce |
| 250 milliliters | → | 1 cup |
| 500 milliliters | → | 1 pint |
| 1 liter | → | 1 quart |
| 4 liters | → | 1 gallon |