Percent Daily Value calculator
The %DV column on a label is one number in a serving divided by the Daily Value for that nutrient. This does that sum, in both directions.
100 % DV
Daily Value for Vitamin C is 90 mg, and this is the same arithmetic the label does.
Below 100% is not automatically a shortfall. This is a generic reference, not a personal target.
How it works
- Pick the nutrient, then type the amount in one serving. The Daily Value for that nutrient is the reference amount the label column is computed from, and it is printed in the picker.
- The result is the same arithmetic the label does: amount divided by Daily Value, times 100.
- Run it backwards as well: type a percent and get the amount that produces it, which is how you check whether a claim on the front of a bottle matches the panel on the back.
Before you use the number
- A percent Daily Value is a reference figure for a generic adult diet, not a target for you. It assumes a 2,000 calorie intake and it does not know your history.
- Daily Values differ from reference intakes for some nutrients, which is why the picker shows the value used rather than a recommendation.
- Above 100% is not automatically a problem and below is not automatically a shortfall. The tolerable upper intake, where one exists, is the number that matters.
This is general information, not medical advice, and it does not replace your prescriber or a dietitian who knows you.
Questions people ask
What does 100% Daily Value mean?
It means one serving contains the full Daily Value for that nutrient, which is a generic reference amount based on a 2,000 calorie diet. It is not a personal target and it does not mean more is better.
Why is there no Daily Value for some ingredients?
Because no Daily Value has been established for them. Botanicals, enzymes, probiotics and NMN all fall into that group, and the label prints a symbol rather than a percentage. The milligrams are still printed in full.
Can I add up percentages across products?
Yes, and that is the main use for this calculator. If you take a multivitamin and a separate B12, add the amounts first and then convert once, rather than adding two percentages that were computed against different serving sizes.
Sources
- FDA, Daily Value reference amounts for vitamins and minerals on the Nutrition and Supplement Facts labels
- NIH Office of Dietary Supplements, nutrient recommendations and Dietary Reference Intakes
Figures checked against the sources above on 21 September 2026.
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