Calculators
Compound Interest Calculator
See how savings or investments grow with compound interest — future value, interest earned and total growth.
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Future value
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Interest earned
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Total growth
About this tool
Compound interest means earning interest on your interest — the engine behind long-term wealth. Enter a starting amount, an annual rate, the number of years and how often it compounds (monthly, quarterly, yearly…) to see the future value, total interest earned and overall growth.
The difference compounding frequency makes is real: 10 lakh at 8% for 20 years grows noticeably more compounded monthly than yearly. Use it to compare fixed deposits, savings plans and investment scenarios before committing.
How to use
- Enter principal, annual rate and years.
- Pick the compounding frequency.
- Read the future value and interest earned — tweak values to compare scenarios.
Frequently asked questions
FV = P × (1 + r/n)^(n×t), where P is principal, r the annual rate as a decimal, n compounds per year and t years.
Simple interest pays only on the principal every period. Compound interest pays on principal plus accumulated interest, so growth accelerates over time.
No — this version models a single lump sum. For recurring deposits, run it per deposit or treat the average balance approximately.