Caffeine Calculator
Count up the coffee, tea and energy drinks you get through by the day, week or month and see what it comes to in milligrams of caffeine a day, a year, and in money.
What You Drink
Enter the number you drink in that whole period, not a daily average. Fourteen a week and two a day come to the same thing.
Averages for a typical serving. The same drink varies a lot between one cafe and the next, so treat these as a starting point.
Leave this at zero to skip the cost line.
Your Caffeine
caffeine per day, from 2 servings a day at 95 mg each
Yearly totals assume you keep this up every day for a full year. The 400 mg figure is a general one for healthy adults; guidance in pregnancy is typically around 200 mg, and individual sensitivity varies enormously. This is a bit of arithmetic for interest, not health advice.
Caffeine by Drink
| Drink | Caffeine per serving | Servings to reach 400 mg |
|---|---|---|
| Brewed coffee (8 oz)selected | 95 mg | 4.2 |
| Espresso (1 oz shot) | 63 mg | 6.3 |
| Instant coffee (8 oz) | 62 mg | 6.5 |
| Latte or cappuccino (one shot) | 63 mg | 6.3 |
| Cold brew (8 oz) | 155 mg | 2.6 |
| Decaf coffee (8 oz) | 2 mg | 200 |
| Black tea (8 oz) | 47 mg | 8.5 |
| Green tea (8 oz) | 28 mg | 14.3 |
| Energy drink (8 oz) | 80 mg | 5 |
| Cola (12 oz) | 34 mg | 11.8 |
Typical averages only. Brewing strength, cup size and the beans themselves move these numbers around, and a large takeaway cup is often two or three of the 8 oz servings listed here.
How It Works
Whatever period you pick is converted to a daily rate first: a weekly figure is divided by seven, and a monthly one is multiplied by twelve and divided by 365.25, the length of an average year in days. Everything else follows from that one number.
caffeine per day = servings per day × caffeine per serving
The 400 mg a day comparison is the figure the FDA commonly cites as not generally associated with negative effects for healthy adults. It describes a population, not any particular person: caffeine metabolism varies several-fold between individuals, and guidance during pregnancy is typically lower, around 200 mg a day. Plenty of people notice effects well below 400 mg and others none at all.
Caffeine also hides in places the dropdown does not cover — chocolate, some soft drinks, pre-workout powders and a number of over-the-counter medicines — so a real daily total is often higher than the coffee count alone suggests.
Frequently Asked Questions
- How much caffeine is in a cup of coffee?
- An 8 ounce cup of brewed coffee averages about 95 mg. A single espresso shot is around 63 mg, instant coffee about 62 mg, and cold brew is much stronger at roughly 155 mg for 8 ounces. These are averages rather than fixed values: the beans, the roast, the grind and the brew time all move the figure, and the same drink from two cafes can differ by a factor of two.
- How much caffeine a day is commonly considered fine?
- The FDA commonly cites 400 mg a day as an amount not generally associated with negative effects for healthy adults, which is roughly four 8 ounce cups of brewed coffee. That figure describes a general population rather than any particular person. Guidance during pregnancy is typically lower, around 200 mg a day. Anyone with a specific concern should raise it with a doctor rather than a calculator.
- Why does the calculator ask per day, per week or per month?
- Because people count their drinking in whatever period feels natural. Someone who has two coffees every morning thinks in days, while someone who only drinks coffee at work thinks in weeks. The calculator converts whichever you pick to a daily rate, so 14 a week and 2 a day give exactly the same result.
- Does espresso have more caffeine than drip coffee?
- Per ounce yes, per cup usually no. A 1 ounce espresso shot carries about 63 mg of caffeine, which is far more concentrated than drip coffee, but an 8 ounce cup of drip coffee is about 95 mg because there is so much more of it. A latte made with one shot sits at roughly the espresso figure, since the rest is milk.
- Is decaf coffee caffeine free?
- No. Decaffeination removes most of the caffeine but not all of it, leaving roughly 2 mg in an 8 ounce cup against about 95 mg for regular coffee. That is small enough not to matter for most people, though several cups a day still add up to a measurable amount.
- What else has caffeine in it besides coffee and tea?
- Energy drinks, cola and other soft drinks, chocolate, pre-workout and weight loss supplements, and a number of over-the-counter painkillers and cold remedies all contain caffeine. A total worked out from drinks alone is usually an underestimate, so it is worth reading labels if you want an accurate daily figure.