Standards

Our methodology

AllKindsOfConverters is built to be auditable. This page describes exactly how a number on this site gets from a primary standard to your screen.

1. Source primary definitions

Unit definitions are taken from BIPM (the SI Brochure), NIST SP 811, ISO 80000 and the relevant national metrology institutes. Where a unit has multiple historical definitions (e.g. US survey foot vs international foot), we document each.

2. Derive and audit formulas

Every conversion factor is encoded as an exact rational where possible. Engineering review compares the result against at least two independent reference implementations and a published reference table.

3. Continuous validation

Automated test suites run against thousands of known reference pairs. Currency rates are validated against a baseline provider and refreshed on a fixed cadence; stale rates surface a visible warning.

4. Transparent updates

When a unit redefinition occurs (e.g. the 2019 SI redefinition) or a methodology changes, we publish a note and update the affected converters within one release cycle.

Rounding and precision

Internal calculations are performed in 64-bit floating point with rationally-defined constants. Display precision is configurable per converter (default: 6 significant figures for general use, 12 for scientific tools). We never silently round before the display step.

Currency methodology

FX rates are pulled from a primary provider and cross-checked against a secondary reference at refresh time. Mid-market rates are shown by default; retail rates include broker spreads which vary by institution. A “rates updated” timestamp is shown on every currency tool.

AI & automation disclosure

Conversion math is rule-based, not AI-generated. AI tooling assists with editorial drafts and code review; every published explanation and formula is reviewed by a human editor before going live.

Corrections

If you find an inaccuracy, email corrections@allkindsofconverters.com. We log every report and credit substantial corrections on the Editorial Standards page.