How the RD estimate is calculated
The calculator applies a quarterly-compounding approximation to monthly installments: Maturity = P × ((1 + i)n − 1) ÷ (1 − (1 + i)−1/3), where P is the monthly installment, i is the annual rate divided by 400, and n is total months divided by 3.
Installments
One equal contribution is assumed every month for the full tenure.
Compounding
The entered annual rate is modelled with quarterly compounding.
Assumptions
The rate remains constant; missed payments, tax, TDS, penalties, and bank-specific rules are excluded.