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Medication Dosage Calculator

Convert a prescribed dose per kilogram into a volume or tablet count.

About Medication Dosage Calculator

Weight-based dosing is divided across the daily administrations, and the liquid volume follows from the concentration. The absolute daily maximum overrides the weight calculation in heavier patients. Weight-based dosing can exceed absolute maxima in larger adults, which is why the ceiling check matters as much as the arithmetic.

Formula

Medication Dosage

Daily dose = weight × dose per kg; per administration = daily dose ÷ doses per day

mg/kg
Weight-based dosing, standard where clearance scales with body size
maximum daily dose
An absolute ceiling that overrides the weight-based figure

Worked example

With the default values below, Medication Dosage Calculator returns Dose per Administration of 233.333. Change any input above and every figure here is recalculated in your browser.

Inputs used

Body weightminimum 0.1 kg
70 kg
Prescribed dose per kilogramminimum 0.001 mg/kg
10 mg/kg
Doses per dayminimum 1
3
Liquid concentrationminimum 0.001 mg/mL
100 mg/mL
Maximum daily doseminimum 0.001 mg
4,000 mg

Results

Dose per Administration
233.333 mg
Total Daily Dose
700.000 mg
Liquid Volume per Dose
2.333 mL
Within the Stated Maximum
Yes
Share of the Maximum Daily Dose
17.50%

Step by step

  1. 1Values used
  2. 2Medication Dosage
  3. 3Dose per Administration= 233.333 mg
  4. 4Total Daily Dose= 700.000 mg
  5. 5Liquid Volume per Dose= 2.333 mL
  6. 6Within the Stated Maximum= Yes
  7. 7Share of the Maximum Daily Dose= 17.50

Assumptions and limits

  • The result is derived only from the 5 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.
  • This performs arithmetic on figures you supply and does not recommend any drug, dose or route. Medication errors can cause serious harm or death. Always verify every calculation independently, confirm against the prescription and product literature, and follow your institution's double-check procedures. Never self-medicate or alter a prescribed dose.
  • 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.

This performs arithmetic on figures you supply and does not recommend any drug, dose or route. Medication errors can cause serious harm or death. Always verify every calculation independently, confirm against the prescription and product literature, and follow your institution's double-check procedures. Never self-medicate or alter a prescribed dose.

Frequently Asked Questions

How is Medication Dosage calculated?

Daily dose = weight × dose per kg; per administration = daily dose ÷ doses per day Weight-based dosing is divided across the daily administrations, and the liquid volume follows from the concentration. The absolute daily maximum overrides the weight calculation in heavier patients.

Why does Medication Dosage matter?

Weight-based dosing can exceed absolute maxima in larger adults, which is why the ceiling check matters as much as the arithmetic.

What values do I need to enter?

This calculator takes 5 inputs: Body weight, Prescribed dose per kilogram, Doses per day, Liquid concentration, Maximum daily dose. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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