Compound Interest Calculator
Calculate how your money grows with compound interest, at any compounding frequency.
Investment details
Maturity amount
₹2,20,803.97
Principal
₹1,00,000.00
Interest earned
₹1,20,803.97
How this is calculated
A = P(1 + r/n)ⁿᵗ, where P is principal, r is the annual interest rate, n is the number of compounding periods per year, and t is time in years.
Pricing is verified against provider pricing pages as of 2026-09-01. AI and cloud pricing changes frequently — confirm the current rate on the provider's own pricing page before budgeting.
Frequently asked questions
What's the difference between simple and compound interest?
Simple interest is calculated only on the original principal for the entire period. Compound interest is calculated on the principal plus all previously earned interest, so returns accelerate over time.
Does compounding frequency really make a difference?
Yes, though the effect is smaller than the rate or time period — daily compounding earns more than annual compounding at the same nominal rate, because interest starts earning its own interest sooner.
What's the 'Rule of 72'?
A quick mental shortcut: divide 72 by your annual interest rate to estimate how many years it takes an investment to double. At 8%, for example, that's roughly 9 years — this calculator gives you the exact figure.
Where is compound interest used in real life?
Fixed deposits, recurring deposits, savings accounts, bonds, and loan interest all use compound interest — this calculator's formula is the building block behind the FD and RD calculators on this site.