🧮 Caffeine Dose Calculator
Caffeine improves endurance, strength, and concentration. However, it is important not to exceed a safe dose.
🎯 What the Calculator Shows
Based on body weight and purpose, the calculator calculates an approximate caffeine dose in milligrams and converts it to cups. For sports, it uses the logic of 3–6 mg/kg; for daily use, 1,5–3 mg/kg. This is a planning guideline: you see what dose size corresponds to your weight, not "how much caffeine is needed" by your body.
⏱️ When and How Much
- Before training: most commonly taken 30–60 min. before start; the effect is felt relatively quickly, so there is no point in a large dose "just in case".
- Daily: about 400 mg per day is often considered the upper reference limit for adults — regularly exceeding it increases the risk of side effects.
- Sensitivity Is Individual: it is affected by genetics, sleep deprivation, medications and usual caffeine intake.
- Coffee Is Not Just Caffeine: cup strength varies greatly, so the amount stated on the label or a calculator is more reliable than counting cups (see caffeine for endurance).
⚠️ Where Limits and Risks Lie
- Sleep: caffeine is metabolized over hours, so late intake can worsen sleep even if the effect is not felt (see sleep hygiene).
- Tolerance: regular use reduces the perceived effect; a short break often restores it.
- Side effects: anxiety, tremors, heart palpitations, digestive issues, headache — this is a sign to reduce the dose, not increase it.
- Caution: with cardiovascular disease, blood pressure problems, taking medications or during pregnancy — consultation with a doctor is essential.
- Avoid Combining Multiple Stimulants (energy drinks, pre-workout mixes) — effects add up, and control is lost.
🙋 FAQ
Can It Be Used Daily? Some people do just that, while others notice worsened sleep or anxiety. If you no longer feel the effect or side effects have appeared — review the dose, not increase it.
Does Caffeine Help Burn Fat? It slightly increases energy expenditure, but the effect is small and will not replace a calorie deficit (see calorie deficit).
Are Tablets Better Than Coffee? They allow more precise dosing, but dosing errors with capsules and powders are dangerous — follow the label and do not measure "by eye".
Are Breaks Worth It? A regular break helps you understand how much caffeine you actually need daily.
📚 Scientific Basis
The doses used by this calculator are standard sports nutrition recommendations: 3–6 mg caffeine per kilogram of body weight 30–60 minutes before exercise, with a daily limit of 400 mg.
In sports nutrition textbooks, caffeine is described as one of the most researched ergogenic supplements: effects are observed during both endurance and short high-intensity efforts. Importantly, it is not a "fat-burning" agent — the effect is related to reduced perceived fatigue and alertness.
Source: NSCA guide "Guide to Sport and Exercise Nutrition"; Webb G. P., "Dietary Supplements and Functional Foods" (Blackwell, 2006).