Compound Interest Calculator
See how your investments grow over time with the power of compound interest
Final Amount
₹1,13,669.42
- Total Put In
- ₹80,000.00
- Total Interest
- ₹43,669.42
Before tax, inflation and charges.
Breakdown
- Initial investment
- ₹10,000.00
- Contributions added
- ₹70,000.00
- Growth on the initial amount
- ₹12,196.40
- Growth on the contributions
- ₹31,473.02
- Effective annual rate
- 8.300%
- Total interest
- ₹43,669.42
- Final amount
- ₹1,13,669.42
Composition
Initial investment₹10,000.00 · 8.1%
Contributions₹70,000.00 · 56.6%
Interest₹43,669.42 · 35.3%
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How this is calculated
Formula
A = P × (1 + r/n)^(n×t) + PMT × [((1 + r/n)^(n×t) − 1) ÷ (r/n)]
- A
- = final amount
- P
- = initial investment
- PMT
- = contribution per period
- r
- = annual rate as a decimal
- n
- = compounding periods per year
- t
- = years
With your numbers
- 1Rate per periodr ÷ n0.0800 ÷ 12 = 0.006667
- 2Number of periodsn × t12 × 10 = 120
- 3Compound the initial amountP × (1 + r/n)^(n×t)₹10,000.00 → ₹22,196.40 (₹12,196.40 of growth)
- 4Compound the contributionseach one for the periods remaining after it is paid in₹70,000.00 contributed → ₹1,01,473.02 (₹31,473.02 of growth)
- 5Add themA = compounded principal + compounded contributions₹22,196.40 + ₹1,01,473.02 = ₹1,13,669.42
Final amount₹1,13,669.42
- Rule of 72: at 8.0% a lump sum roughly doubles every 9.0 years. It is an approximation, but a good one between about 5% and 15%.
- Compounding 12× a year turns the 8.00% nominal rate into an effective 8.300%. Compare instruments on the effective rate, never the nominal one.
- Contributions are treated as arriving at the end of each month. Paying at the start instead adds one extra period of growth to every contribution.
Frequently Asked Questions
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