Methodology

How calculators are built

Every calculator on Boost.cards runs client-side in your browser. The inputs are private — they are not transmitted to a server. The formulas are written in plain math and published on the calculator page itself.

The formulas are deliberately simple enough to be auditable in five minutes by anyone with a calculator. If a formula becomes more complex than that, it is replaced with a simpler equivalent.

• Inputs: declared in plain language with units.
• Formula: published on the page.
• Assumptions: named, with their default values shown.
• Output: clearly labeled — what number is shown, what it means.
• Limits: stated where applicable.

Editorial review cadence

Each pillar, guide, resource and comparison carries a "last verified" date. We re-check material on a rolling basis, prioritized by what is most likely to change (compliance rules, vendor archetypes, calculator formulas).

We do not promise real-time updates. Where a number is sensitive to recent change, we say so on the page.