Caffeine Intake Calculator
This calculator scales a caffeine amount to body weight, using 6 mg per kilogram for a daily figure capped at 400 mg and 3 mg per kilogram for a single dose. Both figures are shown in milligrams.
What this calculator does
The Caffeine Intake Calculator estimates your result instantly from the values you enter, using standard health & fitness formulas. This calculator scales a caffeine amount to body weight, using 6 mg per kilogram for a daily figure capped at 400 mg and 3 mg per kilogram for a single dose. Both figures are shown in milligrams. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate rather than a certified or official figure.
Result
About Caffeine Intake Calculator
The Caffeine Intake Calculator multiplies your body weight in kilograms by 6 for a daily figure, which is capped at 400 mg, and by 3 for a single dose. Both amounts are shown in milligrams.
These are general guidance figures produced by the tool, not medical advice.
Formula & Mathematical Calculation
Safe Daily Max (mg) = f(Body Weight (kg))
Calculated according to standard health formulas implemented in the calculator core.
Calculation Example
Enter a body weight of 70 kg. The daily figure is 6 × 70 = 420 mg, but it is capped, so the tool shows 400 mg.
The single dose is 3 × 70 = 210 mg. The boxes read 400 mg and 210 mg.
Key Benefits
- Scales both a daily figure and a single dose to your body weight in one step.
- Applies 6 mg per kilogram for the daily amount and 3 mg per kilogram per dose.
- Caps the daily figure at 400 mg regardless of weight.
- Free, runs in the browser, and needs no account.
How to Use this Calculator
-
Enter body weight
Type your body weight in kilograms into the Body Weight (kg) field. -
Calculate
Select Calculate to scale the caffeine figures to your weight. -
Read the figures
Read the Safe Daily Max (mg) and Single Dose (mg) boxes.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Any rate or interval you enter is assumed to hold for the whole period unless the form asks for it separately.
- Results use standard published formulas and account only for the values entered above.
- Rounding is applied for display; the underlying calculation uses your full precision.
- Results are returned in the same units you enter, unless the tool states the output unit.
What it does not cover
- Caffeine Intake Calculator produces a calculated result for reference and learning, not a certified or official measurement.
- Real-world outcomes differ when tolerances, rounding rules or local standards apply.
- Definitions and standards vary by region and change over time; verify the convention that applies to your case.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For work where the result carries real consequences, confirm it against an authoritative source.
Frequently Asked Questions
Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.