Essential Oil Conversion Chart

1/2 dram = 1/16 oz., or approx. 60 drops
1 dram = 1/8 oz., or approx. 120 drops
2 dram = 1/4 oz., or approx. 240 drops
4 dram = 1/2 oz., or approx. 480 drops
8 dram = 1 oz., or approx. 960 drops
1 oz = 2 tablespoons or 6 teaspoons or 30 ml/cc or 28.35 grams or approx. to 700 drops
Another source says 1 oz. = 1120 drops
1 tablespoon = 3 teaspoons or 15ml
1 teaspoon = 5ml/cc
15 grams = 1/2 oz (.52905 oz)
15 grains = 1/4 teaspoon (solid) or 15 drops of fluid
60 grains = 1 tsp. Or about 60 drops
To convert ounces to grams multiply # of ounces by 28.35
To convert grams to ounces you multiply # of grams by .03527
To convert grams to grains you multiply by 15.43
To convert grains to grams divide by 15.43
1 gal. = approx. 7.775 pounds (depending on the liquid)

U.S. to Metric
1/5 teaspoon = 1 milliliter
1 teaspoon = 5 ml
1 tablespoon = 15 ml
1/5 cup = 50 ml
1 cup = 240 ml
2 cups (1 pint) = 470 ml
4 cups (1 quart) = .95 liter
4 quarts (1 gal.) = 3.8 liters

Weight
1 fluid oz. = 30 milliliters
1 fluid oz. = 28 grams
1 pound = 454 grams

Metric to U.S.
1 milliliters = 1/5 teaspoon
5 ml = 1 teaspoon
15 ml = 1 tablespoon
34 ml = 1 fluid oz.
100 ml = 3.4 fluid oz.
240 ml = 1 cup
1 liter = 34 fluid oz.
1 liter = 4.2 cups
1 liter = 2.1 pints
1 liter = 1.06 quarts
1 liter = .26 gallon

Weight
1 gram = .035 ounce
100 grams = 3.5 ounces
500 grams = 1.10 pounds
1 kilogram = 2.205 pounds
1 kilogram = 35 oz.

Cooking Measurement Equivalents
1 cup = 16 tablespoons or 48 teaspoons
3/4 cup = 12 tablespoons
2/3 cup = 10 tablespoons + 2 teaspoons
1/2 cup = 8 tablespoons
3/8 cup = 6 tablespoons
1/3 cup = 5 tablespoons + 1 teaspoon
1/4 cup = 4 tablespoons
1/8 cup = 2 tablespoons
1/6 cup = 2 tablespoons + 2 teaspoons
1/16 cup = 1 tablespoon
1 pint =2 cups
1 quart = 2 pints
1 tablespoon = 3 teaspoons

Droppers come in various sizes with various size openings. A drop is usually exactly the same amount of liquid no matter what size the dropper, but essential oils are very, very thin and lightweight and very, very thick and heavy weight, and so thick Patchouli weighs more in less space than thin Tea Tree. But generally:

1 dropper holds 20 drops which is 1 milliliter
1/2 dropper yields 10 drops which is 0.5 ml.

From The Aromatherapy Book by Jean Rose