Compound interest calculator
Plan growth toward your target
How it works
Model monthly compounding with contributions at the start or end of each month. See whether and when a target is reached within the chosen term. Taxes, fees and changing returns are excluded.
Example
At 0%, an initial 1,000 plus 100 monthly reaches 2,200 after 12 months.
How to use
- Enter your values or choose a local file.
- Choose settings and run the tool.
- Review the result, then copy it or download the file.
Common questions
What rules does this tool use?
Model monthly compounding with contributions at the start or end of each month. See whether and when a target is reached within the chosen term. Taxes, fees and changing returns are excluded.
Are my inputs uploaded?
Calculations, texts and files are processed in this browser. The currency tool requests only currency codes from our server.
Free tool · Inputs processed locally · Updated October 5, 2026