# Compound Interest Calculator

Watch interest earn interest.

URL: https://shortformkit.com/compound-interest-calculator/
Updated: 2026-10-13

Interest is compounded monthly here. Returns are not guaranteed for investments; use a conservative rate.

**Formula:** A = P·(1 + r/12)^(12t) + PMT·((1 + r/12)^(12t) − 1) ÷ (r/12)

Results are estimates for general information, not medical or financial advice.

## How it works

1. **Enter your values** The result updates as you type.
2. **Switch units if needed** Metric or US units, where it applies.
3. **Read the result** Nothing is stored or sent anywhere.

## FAQ

**Is it free?**
Yes. No account, no limits.

**Is my data stored?**
No. The calculation happens in your browser and nothing is sent to a server.


Source: Shortform Kit (https://shortformkit.com/compound-interest-calculator/). Free, no login.