Coffee Calculator
Calculate your optimal coffee intake based on body weight and caffeine sensitivity. Get brewing ratios and health recommendations.
☕ Personal Information
🔬 Brewing Calculator
☕ Caffeine Content Reference
| Drink | Caffeine (mg) | Category |
|---|---|---|
| Drip Coffee (Regular) | 95 | Coffee |
| Espresso (1 shot) | 64 | Coffee |
| French Press | 107 | Coffee |
| Cold Brew | 155 | Coffee |
| Instant Coffee | 62 | Coffee |
| Dark Roast Coffee | 85 | Coffee |
| Medium Roast Coffee | 95 | Coffee |
| Light Roast Coffee | 105 | Coffee |
Based on 8oz (240ml) serving size
Understanding Caffeine
⚡ How Caffeine Works
Caffeine blocks adenosine receptors in your brain, preventing drowsiness and increasing alertness.
- Takes 15-45 minutes to take effect
- Peak effect at 30-60 minutes
- Half-life of 3-7 hours
- Completely metabolized in 6-12 hours
📊 Safe Consumption
The FDA recommends a maximum of 400mg caffeine per day for healthy adults.
- Pregnant women: <200mg daily
- Teens: <100mg daily
- Children: Should avoid caffeine
- Sensitive individuals: <200mg daily
⚠️ Overdose Signs
Watch for these symptoms of caffeine overconsumption:
- Jitteriness and anxiety
- Rapid heartbeat
- Insomnia and restlessness
- Headaches and nausea
- Stomach upset
Coffee Brewing Guide
☕ Brewing Methods & Ratios
Drip Coffee
Ratio: 1:15
Example: 20g coffee : 300ml water
French Press
Ratio: 1:12
Example: 25g coffee : 300ml water
Espresso
Ratio: 1:2
Example: 18g coffee : 36ml water
Pour Over
Ratio: 1:16
Example: 22g coffee : 352ml water
Cold Brew
Ratio: 1:8
Example: 38g coffee : 300ml water
AeroPress
Ratio: 1:14
Example: 21g coffee : 294ml water
🎯 Brewing Tips
- Use freshly ground beans for best flavor
- Water temperature: 195-205°F (90-96°C)
- Grind size affects extraction time
- Use filtered water for better taste
- Store beans in airtight container
- Buy whole beans and grind before brewing
- Clean your equipment regularly
- Experiment with ratios to find your preference
Caffeine Calculation Formulas
Daily Caffeine Limit
Formula: Body Weight (kg) × Sensitivity Factor = Daily Limit (mg)
Sensitivity Factors:
- • Very Tolerant: 8 mg/kg (max 400mg)
- • Tolerant: 7 mg/kg (max 400mg)
- • Average: 6 mg/kg (max 400mg)
- • Sensitive: 4 mg/kg
- • Very Sensitive: 3 mg/kg
Safe Cups per Day
Formula: Daily Caffeine Limit ÷ Caffeine per Cup = Safe Cups
Example: 400mg ÷ 95mg = 4.2 cups maximum per day
Brewing Ratio Calculation
Formula: (Desired Volume ÷ Standard Volume) × Standard Coffee Amount = Coffee Needed
Example: (400ml ÷ 300ml) × 20g = 26.7g coffee needed