Caffeine Calculator
Track your daily caffeine intake from coffee, tea, energy drinks and soda. Check if you're within safe limits.
Enter your weight and select servings to calculate total caffeine intake.
Last updated: February 2026
How this calculator is verified
Checked by True Calculator automated test suite on
- Formula verified against a published worked example in the automated test suite
- Edge cases (zero, negative, boundary and unit-mismatch inputs) covered by unit tests
The full verification method is on our how we verify page. Found an error? Tell us and we will re-check it.
When to Use This Calculator
Caffeine is the most widely consumed stimulant in India — in chai, filter coffee, instant coffee, energy drinks and colas — and this calculator adds up the total milligrams consumed in a day and compares it against the safe ceiling of roughly 400 mg. It answers the question people actually search: how many cups of chai or coffee is too many? Enter each drink and its size, and the tool totals your intake, flags when you cross the limit and shows when a late cup will still be affecting you at bedtime. Students pulling all-nighters, professionals chained to their desks and anyone who suspects caffeine affects their sleep use it to find their real daily number.
How to Use This Calculator
- Step 1: Enter how many servings of each drink you have daily, from espresso and coffee to tea, cola and energy drinks.
- Step 2: Enter your body weight in kilograms.
- Step 3: Calculate and read your total caffeine in milligrams and how much of the daily limit that represents.
- Step 4: Check the status label, which reads safe, moderate or high against the 400 mg reference limit for adults.
Worked Example
An office worker in Pune who drinks two cups of filter coffee and two cups of tea a day enters 2 for each drink. The calculator uses typical values of about 95 mg per cup of coffee and 47 mg per cup of tea, so the total comes to 284 mg. Against the 400 mg daily limit cited by health agencies for healthy adults, that is 71 percent of the cap, and the status shows as moderate. Adding a third coffee and an energy drink would push the total past the limit.
Tips and Common Mistakes
- •Tip 1: Count chai separately from coffee; several cups of strong tea add up faster than most people expect.
- •Tip 2: Stop caffeine after early afternoon if you struggle to sleep, since its effects can last for hours.
- •Tip 3: Switch one coffee for a smaller or half-caffeine option to bring a high reading back under the limit.
- ✗Mistake 1: Entering servings as cups of what you make at home when the values assume standard serving sizes, which can differ for large glasses.
- ✗Mistake 2: Ignoring the status label and assuming 400 mg is safe for everyone, since sensitivity varies and the limit applies to healthy adults.
Frequently Asked Questions
How much caffeine is safe per day?
Most health bodies consider up to 400 mg of caffeine a day safe for healthy adults — about 4 cups of brewed coffee. This calculator also scales a weight-based limit of 4.5 mg per kg of body weight, whichever is higher.
How much caffeine is in a cup of coffee?
A typical 240 ml cup of brewed coffee has about 95 mg of caffeine, an espresso shot about 63 mg, black tea 47 mg, green tea 28 mg, a can of cola 34 mg and an energy drink about 80 mg. Amounts vary by brand and brew strength.
When is the best time to stop drinking caffeine?
Caffeine has a half-life of roughly 5–6 hours, so half is still in your system half a day later. To protect sleep, most people stop caffeine 6–8 hours before bedtime.
What are the symptoms of too much caffeine?
Jitteriness, a racing heart, anxiety, trouble sleeping and headaches can all signal too much caffeine. Cutting back gradually over a few days reduces withdrawal headaches.
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