At SIPCalculators.in, we believe in complete transparency. Here are the exact mathematical formulas used in every calculator on our site.
M = P × ({[1 + i]^n – 1} / i) × (1 + i)
We use the correct AMFI-standard formula which derives monthly rate using (1+r)^(1/12)−1 — NOT r/12 which is a common simplification error. This gives more accurate results aligned with how mutual fund NAVs actually compound.
Example: ₹5,000/month at 12% for 10 years: i = (1.12)^(1/12)−1 = 0.009489, n=120, M = ₹11,61,695
M = P × (1 + r/4)^(4×n)
Most Indian banks compound FD interest quarterly. We use 4 as the compounding frequency unless specified otherwise.
Balance(yr) = (Balance(yr−1) + Deposit) × (1 + r)
EMI = P × r × (1+r)^n / [(1+r)^n – 1]
XIRR uses numerical root-finding to solve: Σ[Cash_Flow_i / (1 + XIRR)^(Date_i / 365)] = 0. We use the Newton-Raphson method with 100 iterations for convergence. Initial estimate: 10%. Tolerance: 0.0001%.
Real Return = ((1 + Nominal) / (1 + Inflation)) – 1
All calculations on SIPCalculators.in are estimates based on the assumed return rates entered. Actual mutual fund returns vary and are not guaranteed. Past performance does not guarantee future results. FD rates change frequently — verify with your bank. Tax calculations are based on published CBDT rules for FY 2025-26 and may change. For financial decisions, consult a SEBI-registered investment advisor.
Questions? Contact us or email myself@sipcalculators.in