Compound Daily Calculator

Display currencyFormatting only. This does not change the calculation.

Starting amount The lump sum already invested or deposited today. Use 0 if you are starting from nothing.

Annual interest rate (%)Banks advertise an APY, lenders a nominal rate. Say which one you typed in the field below.

The rate above isChoosing APY converts the quoted yield back to the nominal rate its compounding schedule implies, so a full year returns exactly the APY you typed.

Time invested (years)

Regular contribution Amount added every contribution period. Leave at 0 for a pure lump sum.

Contribution frequency

Contributions are made

Annual increase in the contribution (%)Raises the contribution once a year, for example to track a pay rise.

Inflation rate (%)Used only to restate the final balance in today's purchasing power.

Tax rate on interest (%)Applied to the interest earned to show an after-tax balance. Use 0 for a tax-sheltered account.

Headline figureEvery figure is always computed; this only decides which one is presented as the answer.

Include the year-by-year table

Future value

12,840.03

Compound Interest Calculator

Total you put in

10,000.00

Of which contributions

0.00

Compound interest earned

2,840.03

Effective annual yield (APY)

5.1268 %

Equivalent nominal annual rate

5.000000 %

Multiple of what you put in

1.2840

Balance after tax on interest

12,840.03

Future value in today's money

12,840.03

Years for the balance to double

13.86

Average interest a year

568.01

Average interest a month

47.33

Worked out from Compound interest formula A = P(1 + r/n)^(nt), and the future value of an annuity FV = PMT[((1+i)^N - 1)/i] and 3 other sources.

How this is worked out

5 steps

Rate per compounding period = 5% / 365 compounding daily (365 a year).
Effective annual yield = (1 + r/n)^n - 1 = 5.1267%.
No recurring contributions, so the balance grows from the 10000 starting amount alone.
Future value after 5 years = 12840.03, of which 2840.03 is compound interest on 10000 paid in.
At this yield the balance doubles every ln(2)/ln(1+i) = 13.86 years.

Year-by-year balancetable

year	interest	balance
1	512.67	10,512.67
2	538.96	11,051.63
3	566.59	11,618.22
4	595.64	12,213.86
5	626.17	12,840.03

Results are general information, not financial, tax, legal, medical or engineering advice.