Editorial & Accuracy Policy

Online tools are only useful if you can trust them. This page explains how we design, verify and maintain every Taurang tool.

1. Sourced formulas

Every calculator is built from a recognized source: SI and NIST unit definitions, standard financial mathematics (amortization, time value of money), published health equations (Mifflin-St Jeor, U.S. Navy body-fat method, Tanaka maximum heart rate, WHO BMI categories), NWS weather formulas, WCAG contrast rules and official encoding standards (RFC 4648 Base64, RFC 1321 MD5, FIPS 180-4 SHA). The formula used is shown on each tool page.

2. Exact constants and precise math

Unit conversions use exact defined factors (for example 1 lb = 0.45359237 kg and 1 mile = 1,609.344 m). Integer results such as factorials, combinations and number-base conversions use arbitrary-precision arithmetic, so even 100-digit answers are exact. Decimal results are rounded only for display.

3. Automated verification

Our build runs every tool with its default inputs and checks a reference suite of known answers — for example 100 °C = 212 °F, SHA-256("abc"), BMI of 70 kg at 1.75 m = 22.9 and a standard 30-year amortization payment. A tool cannot be published if it fails.

4. Clear limitations

Where a formula is an estimate (health, finance and construction tools), we say so on the page and recommend professional advice for important decisions.

5. Corrections

If you spot an error, please report it. Confirmed issues are fixed in the shared calculation library so every page that uses the formula is corrected at once.