# Supply Math Notes
> A 30-day supply depends on the serving size. Learn to check how many servings are in a bottle and how that affects how long it lasts.

## Guides
- [Reading Servings per Container](https://thirty-day-supply-explained.pages.dev/servings-per-container/): Servings per container is the number of single servings a bottle holds, and it is the figure that a 30 day claim depends on.
- [Serving Size vs Bottle Size](https://thirty-day-supply-explained.pages.dev/serving-size-vs-bottle-size/): A serving is the amount you take at one time, while the bottle is the whole container, and serving size vs bottle size is the comparison that decides how long.
- [Cost Per Serving Math in Plain Terms](https://thirty-day-supply-explained.pages.dev/cost-per-serving-math/): Cost per serving math means dividing what you pay by the number of servings you actually get, and it only works if the serving count is reliable.
- [Why a Bottle Can Run Out Early](https://thirty-day-supply-explained.pages.dev/when-a-bottle-runs-out-early/): A bottle can run out early because the count you assumed does not match the count inside, or because doses get used differently than planned.
- [The Risks of Stocking Up](https://thirty-day-supply-explained.pages.dev/stocking-up-risks/): Stocking up means committing to a product before you know how it suits you, and some of the facts you would want are missing from the seller's pages.

## About
- [About Supply Math Notes](https://thirty-day-supply-explained.pages.dev/about/): not medical advice, how the site is funded and how guides are made

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