Compound Interest Calculator
Calculate compound interest and future value with optional monthly contributions. Free online savings growth tool.
Investment details
Future value
$20,096.61
$10,000.00
Total contributions
$10,096.61
Interest earned
What the tool does
Compound Interest Calculator projects future value with compound growth and optional recurring contributions for savings and investment sketches.
How to use it
- Enter starting principal, rate, and time period.
- Add monthly contributions if applicable.
- Review projected future value and growth.
Supported formats
- Currency amounts, annual rates (%), time periods
Privacy & security
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
FAQs
- How often does interest compound?
- The calculator uses the compounding frequency shown in the UI (for example monthly). Match it to your account when possible.
- Does this include taxes or fees?
- Usually no. It is a growth estimate before taxes, fees, or market volatility.
- Are inputs stored?
- No.