The coffee reference you will actually use.

Drink Coffee Forever

Brewing guides, caffeine science, ratio calculators, and roast comparisons for people who take their cup seriously.

Reference Tools

• Caffeine Comparison Chart — How much caffeine is in espresso, drip coffee, cold brew, tea, and energy drinks? One clear reference chart with serving sizes and ranges.
• Coffee Brewing Temperature Chart — The ideal brewing temperature for every coffee method — in Fahrenheit and Celsius — plus what happens when water is too hot or too cold.
• Coffee Grind Size Chart — The right grind size for every brewing method — espresso to cold brew — plus troubleshooting for sour, bitter, weak, or muddy coffee.
• Coffee-to-Water Ratio Calculator — Enter your coffee or water amount and instantly get the correct ratio for drip, French press, pour over, or cold brew. Supports grams, ounces, and cups.
• Cold Brew Ratio Guide — Exact coffee-to-water ratios for cold brew concentrate and ready-to-drink, plus steep times, dilution guidance, and troubleshooting.

Latest Coffee Guides

• AeroPress vs French Press: Which Brewer Is Right for You? — AeroPress vs French Press — a complete comparison of taste, grind size, brew time, cleanup, and which one is better for your coffee style.
• Best Coffee for Cold Brew: Beans, Roasts, and Grind Size — The best cold brew starts with the right beans and grind. Here is what roast level, bean origin, and grind size actually do to your cold brew.
• Best Coffee Shops in Asia: Tokyo, Seoul, Bangkok, Singapore, and Beyond — Asia's specialty coffee scene spans Tokyo, Seoul, Bangkok, and Singapore. A city-by-city guide to the best independent cafes worth visiting.
• Best Coffee Shops in Los Angeles: A Neighborhood-by-Neighborhood Guide — The best coffee shops in Los Angeles, from Silver Lake to Venice. Specialty roasters, hidden gems, and the cafes worth the drive.
• Best Coffee Shops in New York City: A Borough-by-Borough Guide — The best coffee shops in New York City by neighborhood — from Williamsburg to the West Village — with what makes each one worth the trip.
• Best Espresso Beans Under $20: Quality Without the Premium Price — The best espresso beans under $20 that actually taste good. What to look for, what to avoid, and which bags are worth buying in 2025.
• Bulletproof Coffee: Does Butter in Coffee Actually Make Sense? — Bulletproof coffee blends coffee with butter and MCT oil. Here is what it is, what the claims are, and what the evidence actually supports.
• How Much Caffeine Is in a Cup of Coffee? By Roast and Brew Method — Caffeine in coffee varies widely by brew method, roast, and serving size. Here are the real numbers with a clear comparison table.
• Coffee and Intermittent Fasting: Will It Break a Fast? — Black coffee does not break a fast for most fasting protocols. Here is what coffee does to your body during a fast and what additions will break it.
• Coffee Brewing Temperature: Why 195–205°F Matters — Water temperature is one of the most important variables in coffee brewing. Here is why 195–205°F is the target and how to hit it without a thermometer.
• Why Does My Coffee Taste Bitter? 5 Easy Fixes — Bitter coffee is almost always caused by one of five fixable problems. Here is how to identify which one is affecting your cup and how to correct it.
• Does Coffee Dehydrate You? Myth vs Practical Reality — Coffee has a mild diuretic effect, but research shows it does not cause net dehydration for regular coffee drinkers. Here is what the evidence actually says.

Read about the editorial process or contact the editorial team.