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Compound Interest Calculator With Regular Deposits

Enter a starting amount, an annual interest rate and a number of years, choose how often interest is compounded, and optionally add a regular monthly or yearly deposit. You get the final balance, your total deposits and interest, a chart and a year-by-year table.

%
yrs

Compounding

Final balance

22,196.40

Total deposits

10,000.00

Total interest

12,196.40

Effective annual rate

8.3%

Growth by year

DepositsInterest

Year-by-year breakdown

YearAddedInterestBalance
110,000.00830.0010,830.00
20.00898.8811,728.88
30.00973.4912,702.37
40.001,054.2913,756.66
50.001,141.8014,898.46
60.001,236.5616,135.02
70.001,339.2017,474.22
80.001,450.3518,924.57
90.001,570.7320,495.30
100.001,701.1022,196.40

The formula

Starting amount: A = P × (1 + r/n)^(n×t)

10,000.00 × (1 + 8% / 12)^(12 × 10) = 22,196.40

P = starting amount, r = annual rate, n = compoundings per year, t = years, D = regular deposit, m = deposits per year, N = number of deposits, i = interest per deposit period.

The rate is treated as fixed for the whole period and no tax or fees are taken off. Real savings and investment returns can differ.

Paying off a loan instead? Use the EMI calculator

How to use the compound interest calculator

  1. Enter the Starting amount, Annual interest rate and Years (whole years from 1 to 100).
  2. Choose the Compounding: Yearly, Half-yearly, Quarterly, Monthly or Daily. Check your bank's terms if you are not sure.
  3. Add a Regular deposit (optional), pick the Deposit frequency (Monthly or Yearly) and whether the deposit is made at the Start of period or End of period.
  4. Read the results: final balance, total deposits, total interest and the effective annual rate, followed by a growth chart, the year-by-year breakdown and the formula with your numbers.

Features

  • Five compounding options, from yearly to daily, with the effective annual rate (APY) worked out for you.
  • Regular monthly or yearly deposits, paid at the start or the end of each period.
  • A year-by-year table of the money added, interest earned and balance for every year.
  • A simple bar chart showing how much of each year's balance is your own deposits and how much is interest.
  • The formula shown with your own numbers, for the starting amount and for the deposits.
  • Instant results as you type, and clear messages for missing or out-of-range values.

A worked example

Suppose you put 5,000 into a savings account paying 6% a year, compounded monthly, and add 200 at the end of every month for 20 years. Over that time you pay in 53,000 of your own money: the 5,000 at the start plus 240 deposits of 200.

The calculator shows a final balance of about 109,000, so interest makes up more than half of it. The year-by-year table makes the snowball visible. In the first year you earn only about 375 of interest, while in the last year you earn about 6,250, because the interest is being worked out on a much bigger balance.

Start or end of the period?

Deposits made at the start of a period earn interest for that whole period, while deposits at the end start earning in the next one. With the example above, moving each 200 deposit to the start of the month adds roughly 460 to the final balance. It is a small difference each month, but it adds up over many years, which is why paying into savings early in the month is a good habit.

Why use Fileora's compound interest calculator

Many calculators give you a single number. This one also shows how the balance builds up year by year, how much of it came from you and how much from interest, and the exact formula behind it, so you can check the maths yourself.

It is free, needs no account and works on any device. Everything is calculated in your browser, so your savings figures stay private.

Borrowing rather than saving? The EMI calculator works out monthly loan instalments and a full repayment schedule. To see how much you could save each month, convert your pay with the salary calculator, and for any other percentage question use the percentage calculator.

Frequently asked questions

What is compound interest?

Compound interest is interest earned on your interest as well as on the money you put in. Each time interest is added, the next round is worked out on the bigger balance. Over long periods this snowball effect makes a big difference: 10,000 at 8% a year grows to about 21,589 in 10 years with yearly compounding, compared with 18,000 with simple interest.

What is the compound interest formula?

A = P × (1 + r/n)^(n×t), where P is the starting amount, r the annual rate as a decimal, n the number of times interest is compounded each year and t the number of years. The calculator shows this formula with your own numbers under the results.

How does compounding frequency change the result?

The more often interest is compounded, the more you earn, but the gains shrink quickly. At 8% a year, yearly compounding gives an effective rate of 8%, monthly about 8.30% and daily about 8.33%. The calculator shows this effective annual rate so you can compare accounts fairly.

How are regular deposits included?

Each deposit earns interest from the moment it is added. Choose whether you pay in monthly or yearly, and whether each deposit is made at the start or the end of the period. Deposits at the start earn one extra period of interest, so the final balance is a little higher. When deposits are more frequent than compounding, each deposit grows at the equivalent rate for its share of the compounding period.

Does the calculator include tax, fees or inflation?

No. It assumes a fixed interest rate for the whole period, with no tax on interest, no account fees and no allowance for inflation. Real savings accounts and investments can pay variable rates, and investment returns are not guaranteed, so treat the result as an estimate.

Can I use it for a loan?

This calculator is built for money that grows. For a loan with fixed monthly repayments, such as a car loan or a mortgage, use the EMI calculator, which shows the monthly instalment, total interest and a repayment schedule.

Are my numbers saved or shared?

No. Every calculation runs in your browser, and nothing is sent to a server or stored.

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