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Live Caffeine
Daily caffeine estimate
SizeUS fl oz
All Coffee Corner tools
Live Caffeine
Caffeine Calculator
Estimate caffeine in coffee, espresso, latte, americano, tea, cola, energy drinks, or a custom drink. Then compare it with a daily limit and an adjustable half-life model.
Caffeine mgAdjustable half-lifeDaily limit check
Brew Lab
Caffeine calculator
Caffeine values use published reference amounts where possible. Coffee varies by bean, dose, grind, brew method, and serving size, so every number stays editable.
Caffeine Guide
A practical caffeine calculator for coffee, espresso, and daily intake
Caffeine calculators are most useful when the numbers are transparent and editable. This tool starts with widely used reference values, then lets you adjust drink type, serving size, number of servings, daily profile, time since drinking, caffeine half-life, and sleep target threshold.
Editable caffeine estimates
Use reference amounts for brewed coffee, espresso, instant coffee, decaf, tea, cola, energy drinks, energy shots, or enter a custom caffeine value from a label.
Adjustable half-life model
Start with a 5 hour caffeine half-life, then adjust from 1.5 to 9.5 hours to model faster or slower metabolism.
Daily limit context
Choose a 400 mg adult profile, a 200 mg cautious profile, or a lower sensitive profile to see how one cup changes the day.
Sleep target estimate
Set the remaining caffeine target you want before sleep and see the estimated time when the current amount falls below it.
How to use this tool
- Choose the closest drink type, then adjust serving size, espresso shots, or the custom caffeine value.
- Set the number of servings and pick the daily profile that fits the person using the calculator.
- Use the elapsed time, half-life, and sleep target controls to estimate what may remain later.
- Treat the output as an educational planning estimate, because products, brew recipes, body size, medications, pregnancy, and sensitivity can change the real-world result.
Quick Answers
Frequently asked questions
How much caffeine is in a cup of coffee?
A common reference estimate is about 96 mg of caffeine in 8 oz of brewed coffee, but real cups vary by bean, dose, grind, and brew method.
How much caffeine is in espresso?
A common reference estimate is about 63 mg of caffeine in a 1 oz espresso shot. Milk drinks usually keep the same caffeine as the espresso shots inside them.
Is 400 mg of caffeine a safe daily limit?
For many healthy adults, 400 mg per day is commonly cited as a general upper limit. People who are pregnant, sensitive, or managing medical conditions should use a lower target and professional guidance.
How long does caffeine stay in your system?
Caffeine is often modeled with an approximate 5 hour half-life, meaning about half may remain after 5 hours. Published pharmacology references report a wide individual range, so this calculator lets you adjust the half-life.
Can caffeine affect sleep even hours later?
Yes. Research has found sleep can be disrupted when caffeine is taken several hours before bed, which is why this calculator includes a sleep target estimate rather than only a daily total.
Is this caffeine calculator medical advice?
No. It is an educational estimate. People who are pregnant, breastfeeding, under 18, taking medication, managing a medical condition, or feeling unwell after caffeine should use professional medical guidance.