Compound Interest (FD & RD) Calculator
Compound interest calculator for savings, an FD or an RD: future value, how much of that is interest, and a year-by-year schedule.
Future value
No balance
Year by year
A deposit to start from
The year the two colours cross
Setting it up
- Initial deposit is whatever is already there on day one. Zero it if you are starting from scratch.
- Monthly contribution is what you add every month. It gets spread across whichever compounding period you choose, so the yearly total holds at any frequency.
- Set the annual rate and the term. Time period takes years plus up to 11 extra months and up to 30 extra days, and a term made of days alone works fine.
- Choose a Compounding frequency from Annually, Semi-annually, Quarterly or Monthly. Those are the 1, 2, 4 and 12 that go into the formula.
- Or start from a deposit: Fixed deposit, Recurring deposit and Public Provident Fund each fill the fields with a worked example of that product. Change any of them and the choice lets go.
- Under the chart, Show growth schedule opens the year table, Download CSV writes compound-growth-schedule.csv, and Share link copies a URL carrying every input you set.
About this tool
Put in what you have today, what you plan to add each month and the rate you expect, and the compound interest calculator gives you the balance at the end of the term. The page opens on a worked case: 1,000 to start, 200 a month, 7% a year, fifteen years, compounding monthly. Future value 66,241.41, of which 37,000.00 is money you paid in and 29,241.41 is interest.
No currency symbol appears anywhere in the tool, which is on purpose. Your 1,000 is rupees or dollars or pounds depending on what you meant by it. The chart opens on Breakdown, one stacked bar per year of what you added against what the money earned, with a Balance tab beside it if you would rather watch the line climb. Year ten of that default run earns 2,380.66 against 2,400.00 of contributions; year eleven earns 2,726.26, so that is the year interest starts out-earning you, and the chart marks it. Shorten the term below eleven years and a note says how far past the end that year falls.
What one dropdown costs you
Leave the page as it loads and the future value is 66,241.41. Change Compounding frequency to Annually, touch nothing else, and it falls to 63,068.68. Identical money at an identical rate, 3,172.73 lighter, and the field says why: the 200 a month becomes 2,400 paid once, at the end of the year, so it earns nothing until December.
Then type 6 into Inflation. Every card now says it is in future money, and a third card reads 27,640.22: what that same balance would buy at today's prices after fifteen years of 6% inflation.
Good to know
- One rate, held flat for the entire term. A fixed deposit really does behave that way, which is why the maturity figure lands close to what a bank will pay. Market returns do not, so a 20-year projection at 12% is arithmetic rather than a forecast.
- Tax is absent. Interest on a deposit is taxable almost everywhere and TDS may be deducted before it reaches you, so every figure here is pre-tax. Inflation is the only adjustment the tool makes, and only when you fill that field in.
Frequently asked questions
Does compounding monthly instead of yearly really make a difference?
At the page defaults it is worth 3,172.73 over fifteen years: 66,241.41 monthly against 63,068.68 annually. Most of that is the deposit moving, not the interest: annual compounding pays the year's 2,400 in once, at the end. The gap widens with the rate and the term. Quarterly, the setting most fixed deposits use, comes in at 65,636.95.
Can I use this as an FD or RD calculator?
Press Fixed deposit and the page fills a lump, nothing monthly and Quarterly, the convention Indian banks use: 100,000 at 7% for five years matures at 141,477.82. Public Provident Fund deposits once a year at the start, as the scheme credits a deposit made by 5 April. Recurring deposit fills a monthly instalment at Monthly compounding, and the field says what the banks' quarterly convention gives instead: about 0.47% more on 5,000 a month for five years.
When does a contribution start earning interest?
Each one lands at the end of its period and earns from the following period onward. The monthly amount you type is converted to the compounding period first, so 200 a month becomes 600 per quarter under quarterly compounding, and the yearly total of 2,400.00 holds whichever frequency you pick. The Public Provident Fund preset is the one exception: its yearly deposit lands at the start of the year, as the scheme credits it.
What does the inflation box change?
It adds a third card, Worth in today's money, and marks every other figure as future money. The future value is divided by (1 + inflation) raised to the number of years, so 66,241.41 at 6% over fifteen years reads 27,640.22 in today's money. A refused inflation holds only that card; the balance does not depend on it.
What is the compound interest formula behind this?
A = P(1 + r/n)^(nt) for the lump sum, with the standard annuity term added for your contributions. P is the initial deposit, r the annual rate as a decimal, n the compounding periods per year and t the term in years. Part-periods from the months and days boxes grow the balance for whatever fraction is left over.
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