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Position / Cost Calculator

Before you buy, get clear on how much to put in at most, how many shares that buys, and the worst loss you can live with. If you're buying in tranches, it estimates an average cost too.

The most you're willing to lose on this trade.
Max quantity you can buy—
Actual amount spent (incl. fee)—
Amount per tranche—
Loss you can accept—

How it's calculated: quantity = amount to invest ÷ [price × (1 + fee rate)]; acceptable loss = amount to invest × loss percentage. Tranches simply split the amount evenly; this doesn't predict price and doesn't include gas or slippage. It's a tool to help you think through your position ahead of time — not investment advice, and certainly not a promise of any return.

Use alongside

For profit and loss, use the P&L Calculator; for how costs stack up, read Fees and Slippage; to avoid the usual traps, read Beginner Mistakes.