Estimate how much you'll have saved by retirement from regular contributions.
Your current savings grow with compound interest (future value = P × (1+r)^n), and your monthly contributions grow using the future value of an annuity formula. Both are added together to get your total projected balance.
This depends on your investment mix — a diversified equity portfolio has historically averaged higher long-term returns than fixed deposits, but comes with more risk. Use a conservative, realistic rate rather than an optimistic best case.