Compound Interest Calculator
Calculate compound interest and watch small monthly amounts grow surprisingly large.
- Runs on your device
- No watermark
- Free, no signup needed
- Available offline
How to use it
- Enter your numbers.
- Results update instantly.
- Adjust any value to compare scenarios.
Questions
How does compound interest work?
You earn interest on your money and on the interest it has already earned. $1,000 at 5% a year becomes $1,050 after one year and $1,102.50 after two, because the second year’s interest is paid on $1,050.
What is the compound interest formula?
A = P × (1 + r/n)^(n × t), where P is the starting amount, r the yearly rate, n how often interest compounds each year and t the number of years. The calculator adds your monthly contributions on top.
Does compounding frequency matter?
A little. Daily or monthly compounding earns slightly more than yearly at the same rate, but the rate and how long you save matter far more.
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