Stop-loss position size calculator

Choose the loss you accept, find what one share loses between your entry and your stop, and divide the first by the second. Round down to a whole share.

The formula is shares = loss you accept / (entry minus stop), rounded down to a whole share. For a short, use stop minus entry.

Use the same formula with the stop above your entry: shares = loss you accept / (stop minus entry). Choose Short in the calculator and it does this for you.

Switch the stop to % away and type the distance. The calculator turns it into a stop price, below your entry for a long and above it for a short, then divides as usual.

Yes. Switch Risk to Dollars and type the amount you accept losing. With % of portfolio, the calculator multiplies your portfolio value by the percent first. The rest is the same.

Risk per trade is the loss you accept if the stop is hit. Position size is the share count that loss allows at your stop, and a closer stop allows more shares for the same risk.

That's your decision, and Allocait doesn't suggest a number. The calculator turns the amount you choose into shares and dollars.

A rule of thumb some traders follow: accept a loss of no more than 1% of the portfolio on one trade. The percent is your choice, and Allocait doesn't suggest one. Type any percent or dollar amount and the calculator sizes it.

That's a position size range: the smallest and largest share of your portfolio one holding may take. You set the range, and Allocait checks each holding against it. The calculator shows the share of your portfolio a result takes.

No. It counts shares only, with no pip value, lot size or contract multiplier.

No. It uses only the entry and stop you type. Fees, or a fill away from your stop, change the real loss.

Neither. Allocait connects to no brokerage, so you place the order and the stop where you trade. What you type stays in this browser tab.