Public calculator library
Financial calculator library
A transparent home for financial calculation methods, released only after formulas, assumptions, rounding, edge cases, and verified examples agree.
Accuracy gate
A calculator library built around reviewed methods.
No calculation is active on this website yet. Each calculator will open only after its formula, assumptions, rounding, edge cases, and test examples have been approved.
Current roadmap
Approved one methodology at a time
Readiness labels describe specification progress, not live financial capability.EMI
Loan amount, annual interest rate, and tenure are identified. Formula, date, precision, and schedule contracts remain under review.
Review planned inputsSIP
A future systematic-investment illustration needs signed compounding, contribution timing, rounding, and disclosure rules.
Income tax
A future tax tool needs regime, jurisdiction, effective-date, source, and update controls before interface work begins.
Public-tool contract
What every calculation contract must disclose
Input meaning
Units, accepted ranges, source expectations, and validation behavior.
Method
The exact formula, sequence of operations, assumptions, and exclusions.
Precision
Internal precision, display rounding, reconciliation, and repeatability.
Evidence
Golden examples, edge cases, ownership, version, and review date.
Privacy by default
Calculation inputs stay private by default
When a public calculator is eventually activated, anonymous values should remain in the browser unless a separate purpose, consent, and protected storage path is introduced.
First methodology