Coffee Calculator - How Much Coffee Should I Drink?
Determine how much coffee you can safely drink based on your body weight and caffeine sensitivity. Our calculator provides personalized recommendations for daily caffeine intake and helps you compare caffeine content across 30+ popular coffee drinks and beverages.
Last updated: January 26, 2026
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Black Coffee (8 oz): 95mg caffeine per serving
Recommended Daily Caffeine
420 mg
Based on your weight and sensitivity level
Your Drink Caffeine
95 mg per serving
1 portion(s) = 95 mg total
Maximum Safe Portions
4 portions
Maximum recommended daily intake of this drink
💡 Remember:
The FDA recommends a maximum of 400mg of caffeine per day for healthy adults. Individual tolerance may vary. Listen to your body and adjust accordingly.
How to Use the Coffee Calculator
Our coffee calculator makes it easy to determine your safe daily caffeine intake. Follow these simple steps:
Step-by-Step Instructions
- Enter your body weight - Input your weight in any unit (kg, lb, oz, stone, etc.)
- Select your caffeine sensitivity - Choose from Very tolerant, Tolerant, Average, Sensitive, or Very sensitive based on how caffeine affects you
- Choose your favorite drink - Select from 30+ coffee drinks, energy drinks, and caffeinated beverages
- Enter number of portions - Input how many servings you plan to consume
- Review your results - See your recommended daily caffeine limit, drink caffeine content, and maximum safe portions
Example Calculation
Scenario: A 70kg person with average sensitivity wants to drink black coffee
- Body weight: 70 kg
- Sensitivity: Average (6mg per kg)
- Recommended caffeine: 70 × 6 = 420mg
- Black coffee: 95mg per 8oz cup
- Maximum safe portions: 420 ÷ 95 = 4.4 cups (approximately 4 cups)
Understanding Caffeine Sensitivity Levels
You can handle large amounts of caffeine without experiencing jitters, anxiety, or sleep disruption. Even multiple strong coffees may not affect you significantly. Your body metabolizes caffeine efficiently.
You have above-average tolerance to caffeine. You can enjoy several cups of coffee throughout the day without negative side effects. Moderate caffeine consumption works well for you.
You have typical response to caffeine. Most people fall into this category. You can enjoy moderate amounts of coffee but may experience side effects if you exceed recommended limits.
You're more sensitive to caffeine than average. Even moderate amounts may cause jitters, anxiety, or affect your sleep. You should limit your coffee intake and avoid caffeine late in the day.
You're highly sensitive to caffeine. Small amounts can cause significant effects including anxiety, rapid heartbeat, or sleep disruption. Consider decaf options or limit to one small cup per day, preferably in the morning.
How to Calculate Caffeine Content in Coffee
Calculating caffeine content helps you stay within safe limits. Here's how to do it:
Method 1: Using Product Labels
- Check the label - Look for caffeine content per 100g or per serving
- Note the serving size - Check if the amount is per cup, per container, or per 100g
- Calculate total caffeine - Multiply caffeine per serving by number of servings
- Example: If a coffee has 95mg per 8oz cup and you drink 2 cups: 95 × 2 = 190mg total
Method 2: Using Volume (Less Accurate)
If you only have volume measurements, you can estimate using the assumption that 1ml ≈ 1g for coffee:
Total caffeine = (Volume in ml / 100) × Caffeine per 100g
Note: This method is less accurate because coffee density varies. Weight measurements are more precise.
Common Coffee Caffeine Content
Regular Coffee:
- • Black Coffee (8oz): 95mg
- • Espresso (1oz): 64mg
- • Cold Brew (8oz): 200mg
- • Instant Coffee (8oz): 62mg
Coffee Shop Drinks:
- • Starbucks Grande: 310mg
- • Dunkin' Medium: 210mg
- • McDonald's Coffee: 109mg
- • Peet's Coffee: 267mg
Coffee Consumption Safety Guidelines
- • Healthy adults: Maximum 400mg caffeine per day (FDA recommendation)
- • Pregnant women: Limit to 200mg per day
- • Children and adolescents: Should avoid or severely limit caffeine
- • People with heart conditions: Consult a doctor before consuming caffeine
- • Timing matters: Avoid caffeine 6-8 hours before bedtime
- • Restlessness, anxiety, or jitters
- • Rapid or irregular heartbeat
- • Headaches or migraines
- • Difficulty sleeping or insomnia
- • Nausea or stomach upset
- • Increased urination
- • Dependency (needing coffee to function normally)
- • Start with less: If unsure of your sensitivity, start with smaller amounts
- • Track your intake: Use our calculator to monitor daily caffeine consumption
- • Consider timing: Drink coffee in the morning or early afternoon, not late in the day
- • Stay hydrated: Balance coffee with water to avoid dehydration
- • Listen to your body: If you experience negative effects, reduce your intake
- • Know your drinks: Different coffee drinks have vastly different caffeine content
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