How much caffeine is in a cup of coffee?

A typical 8oz drip coffee contains 80-100mg caffeine. Espresso has about 63mg per shot. Cold brew can have 100-200mg per 8oz due to higher extraction.

What is the FDA daily caffeine limit?

The FDA recommends no more than 400mg caffeine per day for healthy adults. Pregnant individuals should limit to 200mg. Adolescents should stay under 100mg.

Does Robusta have more caffeine than Arabica?

Yes, Robusta contains roughly 2x the caffeine of Arabica (22mg/g vs 12mg/g). This is why Robusta is used in many instant coffees and energy blends.

Caffeine Calculator

CAFF.CALC Estimate

Bean Type

Roast Level

Brew Method

Coffee Dose

Amount of ground coffee used

Estimated Caffeine -- mg

Daily Limit Tracker

FDA Recommendation 0%

400mg max

Pregnancy Guideline 0%

200mg max

Caffeine Sensitive 0%

100mg max

Cups Today:

Total: -- mg

How It's Calculated

Caffeine = Dose × Bean mg/g × Roast Modifier × Extraction %

This is an estimate. Actual caffeine varies by:

Specific coffee origin
Processing method
Your extraction efficiency
Grind size and water temp

Caffeine Facts

☕

Espresso vs Drip: Espresso has more caffeine per oz, but drip coffee has more per serving due to volume.

🌱

Robusta vs Arabica: Robusta has ~2x the caffeine of Arabica. Many cheap coffees blend in Robusta.

🔥

Roast Level: Dark roasts extract slightly more efficiently, but the difference is minimal.

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Health Note

Caffeine sensitivity varies widely. If you experience anxiety, jitters, or sleep issues, reduce intake. Consult a doctor if concerned.

Caffeine Reference

Typical caffeine content by beverage type.

Coffee

Espresso (single) 63mg

Espresso (double) 126mg

Drip coffee (8oz) 95mg

Cold brew (8oz) 100-200mg

Comparison

Black tea (8oz) 47mg

Green tea (8oz) 28mg

Cola (12oz) 34mg

Energy drink (8oz) 80mg

Daily Limits

FDA (adults) 400mg

Pregnancy 200mg

Adolescents 100mg

Children Avoid