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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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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

Position size calculator

Turn account risk rules into a concrete share count so each trade is sized from the stop distance instead of emotion.

Inputs

Ticker Symbol

Letters, numbers, dots, and hyphens are supported.

Trade direction

Changes how the stop distance is interpreted.

Account size

Total account value or the capital pool you size from.

Risk per trade

Many traders use 0.25% to 1% depending on their style.

Entry price

Stop price

Estimated fees

Use fixed platform, commission, or routing fees here.

How the math works

The calculator starts with your risk budget in dollars, subtracts fixed fees, then divides the remaining amount by the per-share risk between entry and stop. That produces the largest position that still fits your risk cap.

max shares = floor((account size × risk %) - fees) ÷ per-share risk

Per-share risk is the distance between entry and stop for the chosen direction.
Position value shows how much capital the trade would deploy at the entry price.
Account allocation helps you see whether the trade is too concentrated even if the dollar risk fits.

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