Calculation Methodology
Transparency in how we calculate your financial projections.
Our Approach
Transparency is a core value at WealthWiseGrow. We want you to understand exactly how we arrive at the numbers shown in our calculators. Our methodologies are based on standard financial mathematics and Indian regulatory rules.
Standard Formulas Used
EMI Calculation (Reducing Balance)
EMI = [P x R x (1+R)^N] / [(1+R)^N-1]
Where P = Principal, R = Monthly Interest Rate, N = Number of Months.
Compound Interest
A = P(1 + r/n)^(nt)
Used for FD, RD, and generic investment projections.
SIP (Systematic Investment Plan)
FV = P x [((1 + r)^n - 1) / r] x (1 + r)
Calculates the future value of monthly mutual fund investments.
Tax Calculation Logic
Country-specific tools identify the rule set they implement. The income-tax calculators currently use Indian FY 2025-26 / AY 2026-27 slabs, standard deductions, Section 87A rebate, and 4% cess.
- Income Tax: Supports Indian old and new regimes for the stated year. Official Income Tax Department source.
- GST: Applies the user-entered rate to inclusive or exclusive prices and displays either CGST+SGST or IGST based on supply type.
- HRA: Uses the standard three-rule comparison for exemption calculation.
Data Privacy in Calculations
All primary calculations are performed client-side (in your browser). We do not send your personal financial inputs to our servers, ensuring your data remains private and secure.