Caffeine Tracker blog

Guides & comparisons

Honest comparisons, alternatives and how-tos from the Caffeine Tracker team.

Free Caffeine tools

• Caffeine Half-Life & Sleep CalculatorA caffeine half life calculator for bedtime. Enter how many mg you had, when you had it and when you plan to sleep, and see how much caffeine is still in your system at bedtime, the share of the dose that is left, and when it falls to 50 mg.→
• Caffeine Withdrawal Timeline PlannerMap a gradual caffeine reduction from your current daily intake to a day-by-day target, with common caffeine withdrawal windows shown alongside each date.→
• Caffeine in Chocolate CalculatorChoose a chocolate type and enter a serving size to estimate the caffeine in that chocolate serving.→
• Coffee Caffeine CalculatorPick your brew method and cup size to see how much caffeine is in a cup of coffee — the total mg, the mg in a standard 8 fl oz serving, and how much of the FDA's 400 mg daily guidance that uses. Typical values, not a measurement of your specific cup.→
• Coffee to Water Ratio CalculatorFind how much grounds per cup of coffee you need, with grams, approximate tablespoons, water and a 1:n ratio for your brew method.→
• Daily Caffeine Limit CalculatorSee how much caffeine you can have a day according to published guidance for your life stage, with an adult weight-based single-dose figure and drip coffee equivalent.→
• Energy Drink Caffeine CalculatorChoose a brand and product, then enter the number of cans or shots to estimate total caffeine, caffeine density and the share of the FDA 400 mg daily figure.→
• Espresso Caffeine CalculatorWork out how much caffeine is in an espresso shot: choose how many shots you pulled, how you pulled them and which beans went in. You get the total in mg, the mg per shot and how much of the FDA's 400 mg a day it uses.→
• Half-Life Formula CalculatorEnter a starting amount, half-life and elapsed time or target amount. See the remainder, decay table, curve and worked formula for any substance.→
• Matcha & Tea Caffeine CalculatorEstimate how much caffeine is in matcha green tea and other teas from powder weight or brewed serving size. See the result in mg and as a share of the FDA 400 mg daily figure.→
• Soda Caffeine CalculatorEstimate total caffeine intake from soda servings using typical caffeine values for common soft drinks.→
• Yerba Mate Caffeine CalculatorEstimate yerba mate caffeine from the amount of dry leaf, water volume and number of servings. Results are typical estimates, not exact measurements.→

• Does chocolate have caffeine? The sources you never count

  Does chocolate have caffeine? Yes — 12 mg an ounce for dark, 25 at 85% cacao. Plus the caffeine hiding in yerba mate, protein bars, pre-workout, and Excedrin.

  Sep 16, 2026 →

• Caffeine in energy drinks and soda: a milligram chart

  The caffeine in energy drinks runs 80–300 mg a can. Compare Red Bull, Monster, Celsius, Bang and Coke, Diet Coke, and Dr Pepper by the milligram.

  Sep 13, 2026 →

• How much caffeine in decaf coffee? 2 to 15 mg a cup

  How much caffeine in decaf coffee: 2-15 mg per 8 oz cup, 3-16 mg per espresso shot. Why the 97% rule leaves residue, plus zero-caffeine swaps.

  Sep 10, 2026 →

• Does green tea have caffeine? Every tea type in mg

  Does green tea have caffeine? Yes, 20 to 50 mg per cup. Compare green, black, white, oolong, chai, matcha and the herbal teas with none.

  Sep 7, 2026 →

• Does matcha have caffeine? How much, and how it compares

  Does matcha have caffeine? Yes — about 38-88 mg per teaspoon, more than steeped green tea. How it compares to coffee, and what L-theanine changes.

  Sep 4, 2026 →

• How much caffeine in a shot of espresso (and every milk drink)

  How much caffeine in a shot of espresso: about 63 mg for a single, 125 mg for a double — plus the shot-count math for lattes, pods, and Starbucks.

  Sep 1, 2026 →

• Why does caffeine make me tired? The four real causes

  Why does caffeine make me tired? Four separate causes — adenosine rebound, sugar dips, lost sleep, and fast metabolism — plus how to reset tolerance.

  Aug 29, 2026 →

• Caffeine withdrawal timeline: when symptoms start and end

  Caffeine withdrawal starts 12–24 hours after your last dose, peaks at 20–51 hours, and fades in 2–9 days. Full timeline plus a taper that avoids it.

  Aug 26, 2026 →

• Caffeine before bed: how to find your real cutoff time

  How much caffeine before bed is too much? Use half-life math to find your real cutoff — worked cutoffs by dose and bedtime, plus who needs an earlier one.

  Aug 23, 2026 →

• Caffeine and sleep: why you sleep fine and still wake tired

  Caffeine and sleep: how coffee can leave you falling asleep on time while thinning deep sleep, and how to find your own cutoff with two weeks of data.

  Aug 20, 2026 →

• How long does caffeine take to kick in? A dose-by-dose timeline

  How long does caffeine take to kick in? Absorption starts in about 10 minutes, blood levels peak at 30-60, and the plateau holds 2-3 hours.

  Aug 17, 2026 →

• How long does caffeine stay in your system? The half-life math

  How long does caffeine stay in your system? Roughly 5 hours per half-life, about a day to clear — plus what speeds it up, what slows it down, and what doesn't.

  Aug 14, 2026 →

• How much caffeine is too much? The 400 mg rule, explained

  How much caffeine is too much? The FDA's 400 mg/day figure explained — what it covers, the 200 mg single-dose ceiling, and what 400 mg looks like in real cups.

  Aug 11, 2026 →

• How much caffeine in a cup of coffee: mg by brew method

  How much caffeine in a cup of coffee? Drip runs about 95 mg per 8 oz, cold brew near 200 mg per 16 oz. Full mg reference table by brew method.

  Aug 8, 2026 →

• Best 7 Mycaffeine Alternatives in 2026: Track Smarter, Sleep

  Discover 7 mycaffeine alternatives tested for iOS, Android, and Apple Watch. We compare intake scoring rules, half-life tracking, and sleep integration features.

  Aug 3, 2026 →

• Best 8 Hicoffee Alternatives in 2026: Track Caffeine Smarter

  Searching for hicoffee alternatives? We compare 8 caffeine tracking apps on platform support, watch compatibility, and intake scoring rules to find your fit.

  Aug 3, 2026 →

• Best 9 Caffeine Sleep Planners in 2026: Track & Time Your Intake

  Discover the top caffeine sleep planner alternatives comparing watch support, half-life scoring rules, and iOS vs Android availability to optimize your cutoff time.

  Aug 3, 2026 →

• Best 9 Beanbook Alternatives in 2026: Track Caffeine Without the

  Searching for beanbook alternatives? We compare 9 caffeine tracking apps on platform availability, watch support, scoring rules, and logging speed to find your ideal fit.

  Aug 3, 2026 →

• Best 9 Beanbop Alternatives in 2026: Track Caffeine Smarter

  Searching for beanbop alternatives? We compare 9 caffeine tracking apps across Apple Watch support, half-life scoring rules, and platform availability.

  Aug 3, 2026 →

• Best 7 Cafeor Alternatives in 2026: Track Caffeine Smarter

  Looking for cafeor alternatives? We compare 7 caffeine tracking apps on platform support, watch integration, scoring rules, and intake logging to find your best fit.

  Aug 3, 2026 →

• Best 8 Caffeine Clock Alternatives in 2026: Track Intake Smarter

  Compare 8 caffeine clock alternatives covering Apple Watch, Wear OS, half-life scoring rules, and widget support. Find the best app to log your daily intake accurately.

  Aug 3, 2026 →

• Best 7 Caffi Alternatives in 2026: Track Caffeine Smarter

  Searching for caffi alternatives? We compare 7 caffeine tracking apps on platform support, watch integration, scoring rules, and half-life visualization.

  Aug 3, 2026 →

• Best 8 Coffi Alternatives in 2026: Track Caffeine Smarter

  We compare 8 coffi alternatives for iOS and Android, testing Apple Watch support, half-life scoring rules, and drink databases to find the best caffeine tracker.

  Aug 3, 2026 →

• Best 7 Cafflow Alternatives in 2026: Track Caffeine Smarter

  Looking for cafflow alternatives? We compare 7 caffeine tracking apps on platform support, watch integration, scoring rules, and half-life customization.

  Aug 3, 2026 →

• Best 8 Recaf Alternatives in 2026: Track Caffeine Smarter

  Searching for recaf alternatives? We compare 8 caffeine tracking apps on platform availability, watch support, and scoring rules to help you find the right fit.

  Aug 3, 2026 →