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Compound interest on 1,000 at 10% for 30 years

Investing 1,000 at 10% per year, compounded monthly, grows to 19,837.4 after 30 years — 18,837.4 in interest.

Grows to 19,837.4

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Full breakdown

Future value (monthly compounding)19,837.4
Interest earned18,837.4
Growth multiple19.84×
Same with simple interest4,000
Extra from compounding15,837.4

Step-by-step working

  1. Monthly rate = 10% ÷ 12 = 0.8333%
  2. Periods = 30 × 12 = 360
  3. A = 1000 × (1 + 0.008333)^360 = 19,837.4

A = P × (1 + r/n)^(n·t), n = 12

Try your own numbers with the Compound Interest Calculator.

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