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Caffeine Limit Calculator

Work out caffeine limit instantly with clear inputs, formula shown and shareable results.

About Caffeine Limit Calculator

Totals caffeine intake from drinks and compares it with the 400 mg adult ceiling and the 5.7 mg per kilogram EFSA guidance.

Formula

Caffeine limits

EFSA considers single doses up to 3 mg/kg and daily intakes up to 5.7 mg/kg safe for adults, with 400 mg a day the usual ceiling

Worked example

With the default values below, Caffeine Limit Calculator returns Daily caffeine intake of 285. Change any input above and every figure here is recalculated in your browser.

Inputs used

Weightaccepts 20–250 kg
70 kg
Caffeinated drinks per dayaccepts 0–20
3
Caffeine per drinkaccepts 10–400 mg
95 mg

Results

Daily caffeine intake
285 mg
Applicable daily limit
399 mg
Remaining headroom
114 mg
Intake per kilogram
4.071 mg/kg

Step by step

  1. 1Values used
  2. 2Caffeine limits
  3. 3Daily caffeine intake= 285 mg
  4. 4Applicable daily limit= 399 mg
  5. 5Remaining headroom= 114 mg
  6. 6Intake per kilogram= 4.071 mg/kg

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

How much caffeine is in a coffee?

About 95 mg in a filter cup, 63 mg in an espresso shot and 30 to 50 mg in tea, though brewing varies widely.

Is the limit lower in pregnancy?

Yes. 200 mg a day is the usual advice during pregnancy.

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Caffeine Limit Calculator – Calculate Daily caffeine intake