Free Compound Interest Calculator
See how your money grows when interest earns interest. Set a starting amount, a rate and a term, choose how often it compounds, and add regular deposits to watch the maturity value, the interest earned and the year-by-year path.
Leave the deposit at zero for a plain lump sum. Deposits are added at the end of each period.
₹1,15,892 interest on ₹1,00,000 invested
- Principal
- ₹1,00,000
- Total invested
- ₹1,00,000
- Total interest
- ₹1,15,892
- Effective annual rate
- 8%
- Maturity value
- ₹2,15,892
A projection for planning, not a guarantee. Confirm the exact figures with your bank or adviser before you rely on them.
Project your growth in four steps.
Enter your money and rate, set how often it compounds, add any regular deposits, and read the result. Everything updates as you type.
Enter your money and rate
Type the amount you are starting with and the annual interest rate. Pick your currency so the totals read the way you expect.
Set the compounding
Choose how long you will stay invested and how often interest is added, from yearly all the way down to daily.
Add regular deposits
Top up every month or every year if you like. Leave it at zero for a plain lump sum.
Read the growth
See the maturity value, how much of it is interest, and a year-by-year path, all updating as you type.
The power of compounding.
A few ideas worth knowing before you read the numbers. They are the difference between a guess and a plan.
How compounding works
Each period you earn interest on your money and on the interest already added. Left alone, that snowball is what makes long horizons so powerful.
Why frequency matters
The more often interest is added, the more often it starts earning. Daily compounding beats yearly on the same rate, though the gap is smaller than most people expect.
Regular contributions
Adding a fixed amount every month or year keeps feeding the snowball. The tool adds your deposits through the term and shows how much of the final figure they built.
Compound vs simple
Simple interest is paid only on the original amount. Compound interest is paid on the growing balance, so the two pull apart more and more the longer you wait.
Effective annual rate
A rate of 12% compounded monthly is not really 12% a year. The effective annual rate rolls the compounding into one honest yearly figure you can compare.
How the compound maths works.
The formulas behind the result, with a worked example. The maths is the same in any currency.
Compound interest
A = P (1 + r/n)^(n × t)
Example: ₹1,00,000 at 8% compounded yearly for 10 years grows to about ₹2,15,892.
Interest earned
Interest = A − P
Example: On that ₹1,00,000, the maturity value of ₹2,15,892 means about ₹1,15,892 is interest.
Effective annual rate
EAR = (1 + r/n)^n − 1
Example: 12% compounded monthly works out to an effective 12.68% a year.
With regular deposits
Each period: balance = balance × (1 + r/n) + deposit
Example: The tool runs this step for every period, so your monthly or yearly top-ups compound too.
Numbers that tie back to your books.
This tool is great for a quick projection. But when you need to forecast cash across products and accounts, track the real interest running through your ledgers, and see it all in one place, you want that built into your systems. That is the kind of ERP and finance software we build at Techliphant, shaped around how your business actually works.
Prefer a straight line? Try the simple interest calculator, or plan a monthly SIP with the SIP calculator.
Common compounding questions.
It is a free online tool that shows how money grows when interest is added back and then earns interest of its own. You enter a starting amount, a rate, a term and a compounding frequency, and it shows the maturity value, the total interest and a year-by-year breakdown. You can also add regular monthly or yearly deposits.
The core formula is A = P (1 + r/n)^(n × t), where P is the principal, r is the annual rate as a decimal, n is how many times a year interest is added, and t is the number of years. So ₹1,00,000 at 8% compounded yearly for 10 years is 1,00,000 × 1.08^10, which is about ₹2,15,892. When you add regular deposits, the tool runs the growth one period at a time so those top-ups compound too.
It is how often interest is added to your balance. Yearly means once a year, quarterly four times, monthly twelve times, and daily every day. The more often interest is added, the sooner it starts earning more interest, so a higher frequency gives a slightly larger result at the same headline rate.
Simple interest is worked out only on the original amount, so it grows in a straight line. Compound interest is worked out on the balance including interest already earned, so it grows faster and faster over time. Over long periods the difference is large, which is why compounding matters so much for savings and investments.
Each deposit you add joins the balance and starts earning interest from then on. A steady monthly or yearly top-up can end up being a big share of the final figure, especially over many years. The breakdown separates how much you put in from how much is interest, so you can see the split.
It helps, but less than people think. At 10% a year, daily compounding gives an effective rate of about 10.52% while monthly gives about 10.47%. The rate and the length of time you stay invested matter far more than the frequency.
It is the true yearly rate once compounding is folded in, worked out as (1 + r/n)^n − 1. It lets you compare offers on an even footing, because 12% compounded monthly is really 12.68% a year. The calculator shows it alongside the result.
Yes on both. It is free, there is no sign-up, and it runs entirely in your browser. Nothing you type is sent anywhere or stored, so your numbers stay on your own device.
It is great for a quick projection on savings, a deposit or a loan balance. For forecasting cash across products and accounts, tracking real interest on your books, and tying it all back to your ledgers, you want that built into your systems. That is the kind of ERP and finance software we build at Techliphant.
Private by design: this calculator runs entirely in your browser, so nothing you type is uploaded or stored. It is provided free for quick projections and educational use. For real returns on deposits and investments, confirm the figures with your bank, adviser or accounting software.
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