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Compound interest on 10,000 at 10% for 30 years

Investing 10,000 at 10% per year, compounded monthly, grows to 198,373.99 after 30 years — 188,373.99 in interest.

Grows to 198,373.99

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Full breakdown

Future value (monthly compounding)198,373.99
Interest earned188,373.99
Growth multiple19.84×
Same with simple interest40,000
Extra from compounding158,373.99

Step-by-step working

  1. Monthly rate = 10% ÷ 12 = 0.8333%
  2. Periods = 30 × 12 = 360
  3. A = 10000 × (1 + 0.008333)^360 = 198,373.99

A = P × (1 + r/n)^(n·t), n = 12

Try your own numbers with the Compound Interest Calculator.

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