Compound interest means you earn interest on your original money and on the interest already earned. Over long periods, this can make a large difference.
Use the Compound Interest Calculator to test your own starting amount, contribution, rate of return, and time period.
Why time matters
The same monthly contribution can produce very different results over 5 years compared with 30 years. The longer money stays invested, the more time it has to compound.
Example planning periods
- 5 years can help with short-term savings goals.
- 10 years can show medium-term investment growth.
- 20 years can support education, retirement, or business planning.
- 30 years can show the long-term effect of steady contributions.
Related calculators
Use the Investment Calculator for future value projections and the Retirement Calculator for long-term savings planning. The Inflation Calculator can help compare future dollars with today’s purchasing power.