Calculate supplement serving sizes.
Supplement tablet strengths rarely divide neatly into a target, so the practical question is how many tablets per dose to take and what that actually delivers. Splitting the daily target across the number of doses first, then rounding to the nearest half tablet, gives a schedule you can follow — and reporting the actual milligrams delivered rather than the target makes any rounding error visible instead of hidden.
Dose schedule from tablet strength
Per dose mg = target / doses per day; tablets per dose = round(per dose mg / mg per tablet) to nearest half; delivered mg = tablets per day x mg per tablet
These figures are population-average estimates for general planning only and are not medical or dietetic advice. Individual energy and nutrient needs vary widely with body composition, activity, medication and health status. Consult a qualified health professional or registered dietitian before making significant changes to what you eat, and especially if you are pregnant or breastfeeding, are under 18, or have a medical condition or a history of disordered eating.
Absorption saturates for several nutrients. Calcium absorbs best in doses of 500 mg or less, magnesium is better tolerated split, and water-soluble vitamins in a single large dose are largely excreted. Fat-soluble vitamins A, D, E and K do not need splitting.
Only if it is a scored, uncoated tablet. Capsules, enteric-coated and modified-release tablets must not be split — the calculator rounds to halves for convenience, so raise the doses per day instead if a half is not possible.
Because tablets come in fixed strengths. If your target is 1000 mg and tablets are 250 mg over two doses, two tablets per dose delivers exactly 1000 mg; with 300 mg tablets the nearest practical schedule delivers 1200 mg, and the calculator shows that.