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Caffeine Calculator

Calculate caffeine intake from coffee, tea, and energy drinks.

Last updated: June 13, 2026

Calculator

Cups of Coffee (8oz)

cups

Cups of Tea (8oz)

cups

Cans of Soda (12oz)

cans

Energy Drinks (8oz)

drinks

Results

Total Caffeine237 mg

Safe

From Coffee190 mg

From Tea47 mg

From Soda0 mg

From Energy Drinks0 mg

% of Daily Limit (400mg)59%

How to Use This Calculator

1Enter number of cups of coffee.
2Enter number of cups of tea.
3Enter number of sodas and energy drinks.
4View total caffeine and comparison to recommended limit.

Formula Explanation

Total caffeine is the sum of caffeine from all sources. FDA recommends no more than 400mg per day for healthy adults.

Total = (Coffee × 95mg) + (Tea × 47mg) + (Soda × 34mg) + (Energy × 80mg)

Variables:

Coffee~95mg per 8oz cup

Tea~47mg per 8oz cup

Soda~34mg per 12oz can

Energy Drink~80mg per 8oz serving

Worked Examples

2 coffees, 1 tea, 0 soda, 0 energy

1. Coffee: 2 × 95 = 190mg
2. Tea: 1 × 47 = 47mg
3. Total: 237mg

Result: 237mg — 59% of daily limit

Why Use This Calculator

Track daily caffeine consumption.
Stay within safe limits.
Identify hidden caffeine sources.
Manage caffeine-related sleep issues.

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Tips & Best Practices

Caffeine has a half-life of 5-6 hours — avoid after 2 PM for better sleep.
Espresso has more caffeine per ounce but less per serving than drip coffee.
Decaf coffee still contains 2-15mg of caffeine.
Chocolate contains small amounts of caffeine too (about 12mg per ounce of dark chocolate).

Common Mistakes to Avoid

❌ Not counting all caffeine sources.

✅ Caffeine is in coffee, tea, soda, energy drinks, chocolate, some medications, and pre-workout supplements. Track everything.

❌ Exceeding 400mg without realizing it.

✅ Two large Starbucks coffees can put you at 600mg+. A single Venti drip coffee is about 415mg — already over the limit.

Frequently Asked Questions

How much caffeine is safe?

The FDA recommends a maximum of 400mg/day for healthy adults. Pregnant women should limit to 200mg. Children and teens should consume significantly less.

Does caffeine dehydrate you?

Mild diuretic effect, but the fluid in coffee/tea more than compensates. Moderate caffeine consumption does not cause dehydration.

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<iframe src="https://redicalc.com/embed/cooking/caffeine-calculator" width="100%" height="600" style="border:none;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.1);" title="Caffeine Calculator — RediCalc.com" loading="lazy" allowtransparency="true"></iframe>

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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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