Calculadora de Café Saudável
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
limite_mg = min(400, peso_kg × 6) | xícaras = limite / cafeína_por_xícara
About this calculator
The Healthy Coffee Calculator helps you determine how many cups of coffee you can safely consume per day based on your body weight and brewing method. It uses the formula: maximum caffeine limit (mg) = minimum of 400 mg (general safe limit for healthy adults) and your weight (kg) times 6. Then, it divides that limit by the caffeine per cup for your chosen method to suggest a safe number of cups. Different brewing methods yield different caffeine levels, so the calculator adjusts accordingly.
This tool is useful for coffee lovers who want to enjoy the benefits without side effects like insomnia, anxiety, or palpitations. For instance, a 70 kg person has a limit of 400 mg (since 70×6=420, but capped at 400). Using drip coffee (about 95 mg per cup), they could have up to 4 cups daily. A 50 kg person has a limit of 300 mg (50×6), allowing about 3 cups of the same method. The calculator covers methods like espresso, drip, French press, and instant coffee.
Important precautions: the 400 mg limit applies to healthy adults. Pregnant women, nursing mothers, people with heart conditions, or those sensitive to caffeine should consult a doctor. Also, caffeine is present in tea, soda, and chocolate, so account for those sources. The calculator assumes a standard cup size of 240 ml. For espresso, the volume is smaller (about 30 ml) but caffeine concentration is higher. Always consider your total daily caffeine intake from all sources.
Frequently asked questions
What does the 400 mg caffeine limit mean?
It is the maximum daily intake recommended for healthy adults by health authorities like the FDA. Exceeding it may cause side effects such as insomnia, jitters, and rapid heartbeat.
Why does my weight affect the caffeine limit?
Lighter individuals metabolize caffeine differently and have lower tolerance. The formula uses weight to adjust the limit, providing a safer recommendation.
Which brewing method has the most caffeine?
Espresso has the highest concentration (about 63 mg per 30 ml), followed by French press (80, 100 mg per 240 ml) and drip coffee (95 mg per 240 ml). Instant coffee has the least (about 60 mg per 240 ml).
Can I drink coffee if I am pregnant?
Pregnant women should limit caffeine to 200 mg per day as recommended by doctors. Consult your obstetrician before using the calculator, as the 400 mg limit does not apply.
Does the calculator consider added sugar or milk?
No. It only calculates caffeine from plain coffee. Adding sugar, milk, or cream does not change caffeine content but may affect other health aspects like calories.