A herbal label often shows an extract and a standardised percentage, but not the amount of active compound you actually get. Enter the two numbers from the label and this calculator returns the milligrams of the marker compound per serving.

Add your servings per day and it totals the daily amount as well.

The math in one line

Active compound (mg) = extract amount (mg) × (standardisation % ÷ 100)

500 mg of a turmeric extract standardised to 95% curcuminoids gives 500 × 0.95, which is 475 mg of curcuminoids per serving.

Compare the active amount, not the extract weight

Two products can list the same extract weight and deliver very different amounts of the active compound, because their percentages differ. The result above is the figure worth comparing.

When you check a product against a study, compare the study's dose with this number, not with the raw extract weight. The Study Dose vs Product Dose tool does that comparison for you.

What standardisation cannot promise

A marker compound is not always the one responsible for the effect. Standardisation guarantees a steady amount of one measured substance, which may or may not be the active one.

The percentage on the label is only as reliable as the testing behind it, and a third-party certificate of analysis is what confirms the number. This calculator takes the label at its word and does no measuring of its own.

The amount present is also not the amount absorbed. The Bioavailability Calculator looks at what helps each supplement absorb.

If your label shows a ratio too

Some labels give a ratio such as 10:1 instead of, or alongside, a percentage. The Herbal Extract Ratio Converter shows how much dried plant sits behind a ratio, while this calculator shows how much of the compound is in the extract.

If the extract sits inside a blend with no separate amount, the Proprietary Blend Estimator gives the most it could be. And to see what each real dose costs, try the Cost Per Dose Calculator.

Where this comes from

A standardised extract is defined by the percentage of a marker compound it holds by weight, confirmed by laboratory assay. Two reviews from the National Library of Medicine explain the concept and its limits.

Marker compounds used for herbal medicine standardisation

Determination of marker compounds in a herbal extract

This calculator is for general education only and is not medical or professional advice. Always check product labels and speak with a qualified professional before making decisions about supplements.