Paydown.js

Loan payment calculation library with advanced features. Demo available at http://135.181.40.67/paydowncalc/

Also available as an NPM package.

Features

• fully leap year aware
• freely selectable calculation period
• daily interest calculation
• negative interest calculation
• recurring payments
• recurring payment period length setting
• day count methods supported:
  • act / 360
  • act / 365
• payment methods supported:
  • equal installment
  • equal principal reduction
• freely settable rate changes and extra payments
• optional calculation of payment fees

Browser usage

See dist directory.

Node.js usage examples

See examples directory.

GUI demo

Both examples above are also available in the GUI demo, see http://paydowncalc.loan/

Click Import example button to get the menu.

Demo source codes can be found from gui-demo/reactive directory.

Documentation

See doc directory.

To Do

• more tests
• better input validation
• better documentation
• more day count methods
• loan term features
• etc.

Contributing

Contributions are welcome.

License

Copyright (c) 2019 Jussi Utunen

Licensed under the MIT License