Free Coffee Tool

Caffeine Calculator

Pick your drink type and servings to get an estimate of today's caffeine intake.

By Michael Anderson
Last Updated: September 21, 2026

Caffeine content varies by brew method, strength, and serving size — not just by how "strong" a coffee tastes. Pick your typical drink and how many servings you've had to get a rough daily estimate.

Estimate Your Caffeine Intake

Estimated caffeine

190 mg

% of general 400mg guidance

48%

Figures are typical averages, not measurements of your specific beans or brew — actual caffeine varies by bean, roast, and brew strength. The 400mg figure is the FDA's general guidance for healthy adults, not a recommendation for everyone; check with a doctor if you're pregnant, sensitive to caffeine, or have a health condition affected by it.

What actually affects caffeine content

Brew method and ratio matter more than most of the factors people assume drive caffeine content. A longer contact time (like cold brew's steep, or a stronger coffee-to-water ratio) generally extracts more caffeine, and serving size scales it directly — a 16 oz cup has roughly double the caffeine of an 8 oz cup of the same brew.

Bean species is a bigger factor than roast level: robusta beans generally contain roughly twice the caffeine of arabica, the species used in most specialty coffee. If precise caffeine content matters to you, the bean species and brew ratio tell you more than roast color does.

Cutting back without cutting out coffee

  • Mix in decaf. Blending regular and decaf grounds (or beans) before brewing cuts total caffeine while keeping the ritual and most of the flavor.
  • Brew lighter. A weaker ratio (further toward 1:17-1:18) reduces caffeine per cup without switching drinks entirely.
  • Switch your afternoon cup. Caffeine has a multi-hour half-life, so a later cup lingers longer — an afternoon decaf or half-caf can help sleep without dropping your morning routine.

Frequently Asked Questions

It varies a lot by brew method and strength, but a typical 8 oz cup of drip coffee runs around 95mg, cold brew tends to run higher (around 150mg or more due to a stronger concentrate), and a single espresso shot has roughly 63mg despite its small size — it's just far more concentrated.

Brewing Methods

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How to Make Cold Brew Coffee at Home

Step-by-step cold brew guide — coarse grind, immersion ratio, steep time, straining, and how to store and dilute the concentrate.

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