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Public experience

Northstar

A route-first foundation for marketing, member, and admin sections with Supabase Auth, a row-level-secured database foundation, and a Sanity-powered content layer.

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Finance tool

Compounding calculator

Project how recurring contributions and a steady annual return may grow an account over time through monthly compounding.

Inputs

Ticker Symbol

Letters, numbers, dots, and hyphens are supported.

Starting capital

The amount you begin compounding with today.

Monthly contribution

Added once per month in this projection.

Expected annual return

A hypothetical average annualized return.

Time horizon

yrs

Supports half-year steps by converting the horizon into months.

How the math works

This calculator applies the selected annual return as a monthly growth rate, then adds your recurring monthly contribution after each compounding period. It is a simplified projection meant to show the effect of consistency and time.

ending balance = prior balance × (1 + monthly rate) + monthly contribution

Monthly rate is the annual return divided by twelve.
Total contributions include your starting capital and every monthly deposit.
Investment growth is the difference between the final balance and total capital added.

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