Compound Interest Calculator

See how investments grow over time using the compound interest formula: A = P(1 + r/n)nt

Popular Calculations

Principal Rate Years Future Value Interest
$1,000 5% 10 $1,647.01 $647.01
$1,000 7% 10 $2,009.66 $1,009.66
$5,000 5% 10 $8,235.05 $3,235.05
$10,000 5% 10 $16,470.09 $6,470.09
$10,000 7% 10 $20,096.61 $10,096.61
$10,000 7% 20 $40,387.39 $30,387.39
$10,000 7% 30 $81,164.97 $71,164.97
$10,000 10% 10 $27,070.41 $17,070.41
$25,000 5% 10 $41,175.24 $16,175.24
$50,000 5% 10 $82,350.47 $32,350.47
$50,000 7% 20 $201,936.94 $151,936.94
$100,000 5% 10 $164,700.95 $64,700.95
$100,000 7% 10 $200,966.14 $100,966.14
$100,000 7% 20 $403,873.88 $303,873.88
$100,000 7% 30 $811,649.75 $711,649.75
$500,000 5% 10 $823,504.75 $323,504.75
$1,000,000 5% 10 $1,647,009.50 $647,009.50
$1,000,000 7% 10 $2,009,661.38 $1,009,661.38

Browse by Principal Amount

$100

at 7% for 10 years → $200.97

$500

at 7% for 10 years → $1,004.83

$1,000

at 7% for 10 years → $2,009.66

$2,000

at 7% for 10 years → $4,019.32

$2,500

at 7% for 10 years → $5,024.15

$3,000

at 7% for 10 years → $6,028.98

$5,000

at 7% for 10 years → $10,048.31

$7,500

at 7% for 10 years → $15,072.46

$10,000

at 7% for 10 years → $20,096.61

$15,000

at 7% for 10 years → $30,144.92

$20,000

at 7% for 10 years → $40,193.23

$25,000

at 7% for 10 years → $50,241.53

Formula Used

A = P(1 + r/n)nt

How Compound Interest Works

  • Compound interest earns interest on interest, unlike simple interest which only earns on the principal.
  • The difference between compound and simple interest grows dramatically over longer periods.
  • Rule of 72: Divide 72 by the annual rate to estimate doubling time. At 7%, money doubles in ~10.3 years.
  • Monthly compounding (n=12) yields slightly more than annual compounding (n=1) for the same rate.