Caffeine Content Estimator

Estimate total caffeine intake from coffee, tea, espresso, and energy drinks. See how your intake compares to the FDA daily maximum and how long it takes to metabolize.

Inputs

Caffeine Source

Number of Servings

Serving Size (oz)

Tab to move between fields

Results

Total Caffeine

192 mg

Per Serving96 mg

% of FDA Daily Max (400 mg)48%

Hours to Metabolize21.3 hrs

How to Use This Calculator

Select the caffeine source (drip coffee, espresso, black tea, green tea, or energy drink).
Enter the number of servings and serving size in ounces.
The calculator shows total caffeine in mg, per-serving amount, percentage of the 400 mg FDA daily maximum, and hours to metabolize.
Stay below the 400 mg daily limit; cut off consumption at least 6 hours before bedtime.

How the result changes with Number of Servings

Number of Servings	Total Caffeine
2.9	278 mg
7.65	734 mg
13	1,248 mg
18	1,728 mg

What each input means

Caffeine Source: The type of caffeinated beverage.
Number of Servings: How many servings you consume.
Serving Size (oz): Volume of one serving in ounces. A standard cup is 8 oz, espresso shot is ~1 oz.

How this is calculated

Worked example, using the default values

Identify Input Parameters
Caffeine Source = 1, Number of Servings = 2, Serving Size (oz) = 8 = 3 input(s) provided
Calculate Total Caffeine
192 = 192
Calculate Per Serving
96 = 96
Calculate % of FDA Daily Max
% of FDA Daily Max
48 = 48

Engine last updated July 28, 2026. Checked against 3 independently-derived tests — how we verify calculators.

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