Calcium Carbonate vs Citrate: Compare Amounts on Labels

Compare calcium carbonate and citrate products using the declared calcium amount, serving size, tablet count, and total package value.

Calcium carbonate and calcium citrate are common supplement forms. Product weight and elemental calcium are different values, so use the calcium line in Supplement Facts when comparing packages.

Find the calcium amount per serving

Record milligrams of calcium, the number of tablets or capsules in a serving, and servings per container. The ingredient list may name carbonate or citrate as the source. Some products combine calcium with vitamin D or other nutrients; preserve those lines rather than treating the products as single-ingredient equivalents.

NIH ODS describes carbonate and citrate as the two main forms in supplements and directs consumers to the label for the amount of calcium. This comparison is about disclosed product data; the form name alone does not say which product is personally suitable.

Compare cost per declared calcium amount

Multiply milligrams of calcium per serving by servings per container. Divide package price by total declared calcium and multiply by 1,000 to show price per 1,000 mg. Keep the form and any combination ingredients visible beside the result.

Frequently asked questions

Should I use the tablet’s total weight as calcium?

No. Use the calcium amount declared in Supplement Facts.

Does a combined calcium-and-vitamin-D product equal calcium-only?

No. Record both nutrient lines and compare the formula separately.

Sources and review

Sources: NIH Office of Dietary Supplements, calcium fact sheet for consumers; FDA, dietary-supplement label requirements. Reviewed September 28, 2026.

Use current SuppScan data

SuppScan presents the product data available in its catalog and does not manufacture missing values. Open the Calcium comparison to review current offers and normalized metrics.