Long-term Savings Calculator
Calculate how a lump-sum investment grows with compound interest over time. Compare monthly, quarterly, and annual compounding frequencies.
How to use
- Enter your initial investment amount.
- Enter the annual interest rate.
- Choose the compounding frequency.
- Enter the number of years.
- Click Calculate.
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A long-term savings calculator shows how a single lump-sum deposit grows through the power of compound interest. Unlike recurring savings where you add money regularly, here your initial principal compounds on its own. The longer the duration and the higher the compounding frequency, the more your money grows — even without adding a single extra dollar.
Compounding frequency matters: $10,000 at 7% for 20 years gives $38,697 with annual compounding, $39,343 with quarterly, and $39,515 with monthly compounding — a difference of over $800 purely from how often interest is calculated. This is why choosing accounts or products with more frequent compounding is always preferable, all else being equal.
Frequently Asked Questions
What is the Rule of 72?
Divide 72 by the annual interest rate to estimate how many years it takes to double your money. At 6% it doubles in 12 years; at 9% in 8 years; at 12% in 6 years. It is an approximation but accurate enough for quick planning.
What is the difference between nominal rate and effective annual rate (EAR)?
The nominal rate is the stated annual rate. EAR accounts for compounding frequency — it represents what you actually earn in a year. At 12% nominal with monthly compounding, EAR = (1 + 0.12/12)^12 - 1 = 12.68%. The calculator shows this automatically.
How do I use this for retirement planning?
Enter your current savings as the principal, your expected return rate, and the years until retirement. The result is your projected corpus. Then use the SWP calculator to see how long that corpus will sustain monthly withdrawals in retirement.
Is this the same as an FD (Fixed Deposit)?
Yes, conceptually. An FD is a bank product where you deposit a lump sum at a fixed rate for a fixed term, with compound interest. This calculator mirrors that math — enter the FD amount, rate, and tenure to get the maturity value.
Disclaimer: Results are estimates for informational purposes only and do not constitute financial, tax, or investment advice. Figures may vary based on actual terms. Always consult a qualified financial advisor before making financial decisions.