Power Calculators

💹 Compound Interest Calculator (Daily, Monthly, Yearly)

How interest on interest grows your money — year by year.

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Formula at a glance

Compound Interest Calculator: Compound interest — A = P(1 + r/n)^(nt). Example: ₹1 lakh at 8% for 10 years → Amount after 10 years: ₹2,15,892 (2.16 lakh)
How the Compound Interest Calculator works: Compound interest — A = P(1 + r/n)^(nt)

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📘 About the Compound Interest Calculator

Compound interest pays interest on the interest already earned, so money grows faster and faster. ₹1 lakh at 8% a year becomes ₹2.16 lakh in 10 years with yearly compounding, against ₹1.8 lakh with simple interest. More frequent compounding — quarterly for most Indian fixed deposits, monthly for many savings accounts — adds a little more.

Enter the amount, rate, time and how often interest is added, and optionally a monthly top-up. The calculator gives the final amount, interest earned, the effective annual rate, the doubling time and a year-by-year table and chart, and compares the result with simple interest.

🧮 Formula

Compound interest
A = P(1 + r/n)^(nt)
Continuous
A = Pe^(rt)
Effective annual rate
EAR = (1 + r/n)ⁿ − 1
Rule of 72
doubling time ≈ 72 ÷ rate %

✏️ Worked examples

₹1 lakh at 8% for 10 years

You enter
Currency₹ Indian rupee
Starting amount100000
Interest rate8 % a year
Time10 years
CompoundedYearly
Add every month (optional)0
You get
Amount after 10 years₹2,15,892 (2.16 lakh)
Interest earned₹1,15,892 (1.16 lakh)
Total put in₹1,00,000 (1 lakh)
Effective annual rate (EAR)8%
CompoundingYearly
Simple interest instead₹80,000 — compounding earns ₹35,892 more
Doubling time (rule of 72)9 years (72 ÷ 8 ≈ 9)

₹2,15,892 (2.16 lakh).

Monthly compounding + ₹5,000 a month

You enter
Currency₹ Indian rupee
Starting amount100000
Interest rate8 % a year
Time10 years
CompoundedMonthly
Add every month (optional)5000
You get
Amount after 10 years₹11,36,694 (11.37 lakh)
Interest earned₹4,36,694 (4.37 lakh)
Total put in₹7,00,000 (7 lakh)
Effective annual rate (EAR)8.3%
CompoundingMonthly
Simple interest instead₹80,000 — compounding earns ₹41,964 more
Doubling time (rule of 72)8.7 years (72 ÷ 8 ≈ 9)

₹11,36,694 (11.37 lakh).

🧭 How to use this calculator

What you enter

  • Currency
  • Starting amount
  • Interest rate (% a year)
  • Time (years)
  • Compounded
  • Add every month (optional)

What you get

  • Amount after 10 years
  • Interest earned
  • Total put in
  • Effective annual rate (EAR)
  • Compounding
  • Simple interest instead
  • Doubling time (rule of 72)

❓ Frequently asked questions

What is the formula for compound interest?

A = P(1 + r/n)^(nt), where P is the principal, r the yearly rate as a decimal, n the compounding periods a year and t the years. Interest = A − P.

How often do Indian bank FDs compound?

Usually quarterly. A 7% FD compounded quarterly earns an effective 7.19% a year.

How long does it take to double my money?

Roughly 72 ÷ the interest rate: about 9 years at 8%, 6 years at 12%.

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