Caffeine Intake Calculator
Calculate a body-weight-based daily caffeine guideline and see how many cups of coffee it equals.
- Cups of brewed coffee (95 mg)
- 4.2 cups
- Espresso shots (63 mg)
- 6.3 shots
- FDA adult guideline
- 400 mg/day
Formula: Guideline = 5.7 mg × body weight (kg), alongside the FDA 400 mg adult guideline
About Caffeine Intake Calculator
Caffeine Intake Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate a body-weight-based daily caffeine guideline and see how many cups of coffee it equals.
The calculation uses the standard formula Guideline = 5.7 mg × body weight (kg), alongside the FDA 400 mg adult guideline and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
The European Food Safety Authority considers up to 5.7 mg of caffeine per kg of body weight per day safe for healthy adults, while the FDA cites a flat 400 mg guideline.
Results are estimates for educational purposes and not medical advice.
Frequently Asked Questions
Is Caffeine Intake Calculator free to use?
Yes. Caffeine Intake Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (Guideline = 5.7 mg × body weight (kg), alongside the FDA 400 mg adult guideline) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
How much caffeine is in a cup of coffee?
An 8-oz cup of brewed coffee averages about 95 mg of caffeine, a single espresso shot about 63 mg, and a typical energy drink 80–150 mg per can.
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