Caffeine Intake Calculator

Calculate daily caffeine intake from coffee, tea, energy drinks and soda — see total mg, % of 400mg limit and sleep impact.

Caffeine Intake Calculator

Calculate daily caffeine intake from coffee, tea, energy drinks and soda — see total mg, % of 400mg limit and sleep impact.

Coffees (8oz)

Teas (8oz)

Energy drinks (8oz)

Sodas (12oz)

Enter values above and click Calculate — results will appear here with the formula explained.

Total = coffee*95 + tea*47 + energy*80 + soda*40 mg; % = total/400*100

How does this work?

Caffeine per 8oz coffee ~95mg, black tea ~47mg, energy drink ~80mg, soda ~40mg. Total is sum times quantity. Limit is 400mg for healthy adults per FDA.

This is estimate; brew strength varies 70-140mg. For YMYL sleep and pregnancy, lower limits apply — consult clinician, not just this tool.

Caffeine half-life is 5-6 hours. Afternoon intake affects sleep quality even if you fall asleep.

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Disclaimer: Results are estimates for informational purposes only and do not constitute professional medical advice.

Quick Answer

Caffeine Intake Calculator: Calculate daily caffeine intake from coffee, tea, energy drinks and soda — see total mg, % of 400mg limit and sleep impact. Formula: Total = coffee*95 + tea*47 + energy*80 + soda*40 mg. Example: With 2 coffees (190mg) +1.

How to Use This Calculator

1Enter number of 8oz coffees, teas, energy drinks and 12oz sodas you drink daily.
2Calculate to see total caffeine mg, percent of 400mg limit and sleep warning if high.
3If over 100%, cut one coffee or switch tea — even 95mg less helps afternoon sleep.

Formula Used

Total = coffee*95 + tea*47 + energy*80 + soda*40 mg; % = total/400*100

Caffeine per 8oz coffee ~95mg, black tea ~47mg, energy drink ~80mg, soda ~40mg. Total is sum times quantity. Limit is 400mg for healthy adults per FDA.

This is estimate; brew strength varies 70-140mg. For YMYL sleep and pregnancy, lower limits apply — consult clinician, not just this tool.

Caffeine half-life is 5-6 hours. Afternoon intake affects sleep quality even if you fall asleep.

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Worked Example

With 2 coffees (190mg) +1 tea (47mg) +1 soda (40mg) =277mg total, 69% of 400mg, under limit.

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Frequently Asked Questions

QIs 400mg safe?

FDA says 400mg for healthy adults. Pregnancy limit is ~200mg — half.

QDoes tea count?

Yes, black tea 47mg, green 28mg, white lower. This uses black tea.

QEnergy drinks?

8oz ~80mg, but 16oz cans are 160mg. Enter as 2 if 16oz.

Formula Used

Total = coffee*95 + tea*47 + energy*80 + soda*40 mg; % = total/400*100

Caffeine per 8oz coffee ~95mg, black tea ~47mg, energy drink ~80mg, soda ~40mg. Total is sum times quantity. Limit is 400mg for healthy adults per FDA.

This is estimate; brew strength varies 70-140mg. For YMYL sleep and pregnancy, lower limits apply — consult clinician, not just this tool.

Caffeine half-life is 5-6 hours. Afternoon intake affects sleep quality even if you fall asleep.