Calculator Methodology

Every RupeeVeda calculator uses deterministic mathematics — never an AI model — to produce results. This page summarises our shared approach; each calculator also documents its own formula.

Principles

• Transparent: the formula is shown on each calculator page.
• Deterministic: the same inputs always produce the same output.
• Illustrative: results are illustrations of your assumptions, not forecasts or guarantees.

Core formulas

• SIP: future value of an annuity (investing at the start of each month).
• EMI: standard reducing-balance instalment formula with a full amortisation schedule.
• FD: compound interest with a selectable compounding frequency.
• PPF: annual compounding on the running balance, using an editable, clearly-marked rate assumption.
• Compound interest: period-by-period compounding with optional recurring contributions.

Assumptions and limitations

Our calculators assume constant rates and typically exclude taxes, fees, and product-specific rules unless stated. They are designed for understanding and comparison, not as a substitute for figures confirmed by your bank, fund, or a qualified professional.

Editable statutory assumptions

Rate- and rule-dependent defaults (for example, PPF) are stored centrally and marked as assumptions. They are not official current rates and must be verified before being relied upon.