Methodology
Every calculator on Shankhya is built with the same transparent process. Here is exactly how we develop, verify and maintain our tools.
How formulas are selected
Each calculator starts with a genuine user need. We identify the primary question people ask and select the standard formula that best answers it. Formulas come from established sources:
- Standard financial formulas (e.g., the reducing-balance EMI formula)
- Internationally recognized date and calendar conventions
- Common grading and percentage systems used in education
- Publicly published mathematical and statistical methods
How calculations are tested
Every calculation function is independently testable and covered by automated tests. Each calculator is tested with:
- Normal values – typical inputs users would enter
- Zero and negative values where mathematically relevant
- Decimal values and high-precision inputs
- Very large and very small boundary values
- Invalid and missing inputs to verify error handling
- Date-specific edge cases like leap years and month-end dates
How edge cases are handled
Date calculators handle leap years, month boundaries, year boundaries, same-date inputs, reverse-date inputs and end-of-month cases. Financial calculators handle zero interest rates, rounding precision and payment boundaries. Education calculators handle credit weighting, zero marks and decimal grades.
How content is reviewed
Each calculator page includes content that answers real questions. Before publishing, every page is checked against our quality standards:
- Accuracy – does the formula produce the correct result?
- Clarity – can a person understand the result without a math degree?
- Completeness – are assumptions, limitations and edge cases explained?
- Originality – is the content unique and not copied from competitors?
- Usefulness – does the page answer the question a real person asked?
How updates are handled
Calculators are reviewed when:
- A user reports an error or confusing behavior
- A formula or convention changes (e.g., tax rate changes)
- A new edge case is discovered
- Browser or platform compatibility issues arise
Our review checklist
Every new calculator must pass a 20-point checklist covering purpose, accuracy, inputs, results, content completeness, SEO, accessibility, mobile quality and performance.
Limitations of our tools
Shankhya calculators are educational tools. They provide estimates and explanations, not professional advice. Financial results may differ from actual lender quotes due to fees, rounding conventions and policy variations. Medical or health-related calculators cannot replace evaluation by a qualified professional.