Conversion factor
The amount of the smaller unit it takes to make up one of the larger units.
Conversion factor from a Larger unit to a Smaller one
Multiply by your conversion factor
1 lb = 16 ounces
Go from lbs to oz, multiply by 16
2 lbs x 16 = 32 oz
Conversion factor from a Smaller unit to a Larger one
Divide by your conversion factor
1 gal = 4 qts
Go from qts to gals, you will divide by 4
1 qt/4 = 0.25 gals
FORMULA: Servings you can make
Amount you have / (divided by) Amount you need
FORMULA: Total needed
Servings needed x Amount in a serving
Rounding Up or Down?
If 3rd decimal place is 4 or below, round down. If 5 or above, round up.