The Amount of Caffeine in Coffee
The amount of caffeine in any cup of coffee can vary greatly, depending on the origin of the bean or the mixture of the blend, the method used for brewing and the strength of the coffee brew. Instant coffee generally contains less caffeine than roasted and ground coffee. Many instant especially the flavored instant have a tendency to be consumed in greater volume. Robusta bean coffees have about twice as much caffeine as arabicas.
When we discuss a “cup of coffee” understand it is not a true measured cup but only contains 150 ml (5 oz in the United States) with espresso being as small as 40 ml.
The U.S. Food and Drug Administration gives the following ranges for caffeine in coffee:
A 5 oz cup range of caffeine in coffee
- Roast and ground- 60-180 mg of caffeine
- Drip method – 40-170 mg of caffeine
- Percolator – 60-180 mg of caffeine
- Instant coffee – 30-120 mg of caffeine
Interested Consumer Survey:
An survey of caffeine contents in cups of coffee was conducted in Canada. Whether the coffee was prepared at home, in commercial outlets, or at work, the average caffeine in coffee was about 80 mg per cup. The means for roast and ground coffee, both drip and percolator brewed, were below 85 mg; for instant coffee 71 mg. The problem with the survey, the range of measurements was so wide that, it would be inaccurate to use the figures as a basis for calculating the exact amount of caffeine consumed in a day by an individual. The size of the serving cup also varied from 25 ml (espresso coffee) to 330 ml poured at home. Food establishments also were inconsistent with a range from 130 ml to 280 ml .
Some some the best way to control caffeine in coffee is to drink decaffeinated or a decaffeinated / regular coffee blend. This type of blend can work well for women who are concerned about caffeine and pregnancy.
No matter what method of decaffeination is used on the coffee, the decaffeinated coffee must contain less than 0.1% caffeine (dry weight basis) to legally comply with EC regulations. This works out to about 3 mg caffeine in a cup of decaffeinated coffee.