Methodology
Published by AltiorMinds. Last updated: August 2026.
This page explains, in concrete terms, how a calculator on this site goes from a formula to a published page — what we check before it ships, where our numbers come from, and what we do when something is wrong. We would rather over-explain this than ask you to take “trust us” at face value.
How a formula becomes a calculator
Every calculation on this site is written as a small, standalone function, separated entirely from the page that displays it — the EMI formula, for instance, lives in exactly one place in our codebase and every EMI-based calculator (home loan, car loan, personal loan, and so on) calls that same function rather than each re-implementing the maths. That separation matters for accuracy: a formula fixed once is fixed everywhere it is used, and there is only one place for an arithmetic error to hide.
How we test them
Before a formula function ships, we check it against known-good reference values — figures we can independently verify by hand or against a published example, not numbers the code itself produced. A standard ₹10,00,000 home loan at 8.5% over 20 years should produce a specific, checkable EMI; a ₹1,00,000 fixed deposit at 7% compounded quarterly for 5 years should mature to a specific figure; a 70 kg adult at 175 cm should score a specific BMI. As of this writing, our automated test suite runs 182 such checks across 25 test files, and every one of them re-runs before any change to the site's formulas is published. When we add or change a calculator's underlying maths, the corresponding test is added or updated in the same change — the two are never allowed to drift apart.
Where our rates and methods come from
Where a calculator implements a named, published method rather than plain arithmetic, we say so on the page and credit the method by name — for example the Mifflin-St Jeor equation (1990) for BMR, Naegele’s Rule (1812) for pregnancy due dates, the US Navy circumference method for body fat estimation, the Devine formula (1974) for ideal body weight, and the CBSE 9.5 approximation for CGPA-to-percentage conversion. For India-specific tax and finance figures — income tax slabs, GST rates, HRA exemption rules, stamp duty, PPF and Sukanya Samriddhi interest, EPS pension rules — we track the financial year the figures apply to (currently FY 2025-26 unless a page states otherwise) and keep those rates in a small number of dedicated constants files, so a rate change is a single, reviewable edit rather than a search-and-replace across dozens of pages.
What “estimate” means here
Some figures on this site are necessarily simplified — municipal property tax formulas vary by city far more than one page can capture, cloud and AI API prices change frequently and are marked with an “as of” date, and household cost-of-living data is a planning range, not a licensed dataset. In every case where we know our figure is an approximation rather than an authoritative one, the page says so explicitly and points you to where to check the exact, current number — a bank, an official portal, or a professional. None of this site is financial, medical, tax or legal advice; see our disclaimer for the full statement.
Corrections
If a formula, rate or worked example on this site is wrong, we want to know and we will fix it — this is not a form-letter promise. Tell us exactly which calculator and what you believe the correct figure or source is via our contact page, and we will verify it against a primary source and correct the page, the underlying function, and its test together.