Our Methodology

Every calculator is built on standard, publicly documented formulas — not proprietary black boxes. Our financial tools (loan and mortgage amortization, compound interest, savings growth) use the standard time-value-of-money equations found in mainstream finance references. Physics calculators apply classical Newtonian mechanics and the standard equations of motion. Automotive tools combine manufacturer specification data with industry-standard estimation models.

In other words, the math behind each tool is the same math an accountant, engineer, or technician would use by hand — we simply make it fast and error-free.

Before a calculator is published, it is tested against hand-computed reference cases: we solve the problem manually, step by step, and confirm the tool reproduces exactly the same result. Boundary inputs — zeros, extremes, unusual combinations — are checked deliberately, so the tool handles them safely instead of failing silently.

Some tools rely on external feeds, and we choose sources that are authoritative and independently checkable:

• Currency rates come from the European Central Bank reference feed, complemented by a live market feed.
• VAT number checks connect directly to the official EU VIES system.
• Email verification performs live DNS MX lookups, not guesses from a static list.
• IP geolocation uses public geo databases.

Calculators are re-checked on every release: formulas, reference cases, and data feeds are re-validated before changes go live. If you ever spot an error, tell us — every report is investigated.