Method: where every number comes from

This site only works if you can check it. So every figure is listed below with the page we read it from, the date we read it, and any expiry that applies. If a number here disagrees with the page it cites, that page wins and this site is wrong — tell us and we will fix it.

How the numbers are maintained

1. Read, then write down. A person reads the source page and records the figure with the source URL and the date. Numbers never come from memory, other blogs, or aggregation sites.
2. One place per number. Every figure lives in a data file and is injected into page copy at build time. Copy cannot type a price by hand; if a page tried, the build would fail.
3. Expiry dates. Time-limited offers carry an end date. When the date passes, the offer stops appearing on the site automatically — the build refuses to publish an expired figure.
4. A drift check. A script re-reads the source pages and compares what they say now against what the site publishes. If a figure moves, it reports the difference instead of publishing a stale number.
5. Tests. The break-even formulas are tested against hand-computed examples, and the data files are validated for missing sources and expired figures, on every build.

The table

Read 2026-10-03 unless a row says otherwise.

What we deliberately do not show

• Product prices. We have no licensed price feed, so we publish none. Membership fees are Amazon's own published plan prices, which is a different kind of number, and even those carry a "check the plan page" warning.
• Price monitoring or alerts. None, anywhere, by design. There is no price-watching functionality on this site.
• Third-party estimates. If we cannot read it at the source, it is not on the site.

Known gaps, stated openly

• Grocery delivery minimums. Published minimums for the grocery delivery services conflict across the sources we read ($25 to $100 depending on service and city), and we could not confirm a current figure on Amazon's own help pages. The calculators therefore ask you to set that value yourself instead of shipping a number we do not trust.
• Ad-free video pricing. Reported at $4.99/month by news coverage, not confirmed on Amazon's own page (which requires a signed-in account). Flagged as secondary in the table.
• Card interest rates. We show the advertised range as published on the card's own page. Your rate depends on your creditworthiness; only the issuer can tell you yours.
• Whether any card application pays this site anything. Unverified. We do not assume it does, and the card math does not depend on it.
• Search demand. We do not publish traffic or keyword claims; we have not measured them.

Corrections

If a figure here is wrong or stale, the fastest fix is an email with the URL of the page you checked: hello@worthitnumbers.com. Include the date; prices move.

Rules this site holds itself to

• The affiliate disclosure appears in the footer of every page and immediately next to every affiliate link: As an Amazon Associate I earn from qualifying purchases.
• Links are plain destination URLs. No link shorteners, no redirect hops, no cloaked links, no link-injection scripts.
• No incentive is offered for clicking a link: no rewards, discounts, giveaways or donations tied to a click.
• Verdicts are always conditional on the visitor's own numbers, never absolute. We do not tell anyone a product "is worth it"; we show the arithmetic and where it breaks.
• An independent site. Not affiliated with, endorsed by, or sponsored by Amazon.com, Inc., Chase, or JPMorgan Chase & Co.
• Educational information and arithmetic, not financial, tax, or credit advice. Card terms come from the issuer; confirm everything at the issuer's page before acting.