Free calculator
Position Size Calculator for Stocks, Crypto and Forex
Work out how big a position can be so that, if your stop loss fills at your stop price, you lose about the amount you chose.
- Position size
- 50 shares
- Position value
- $2,500.00
- Amount at risk
- $100.00
- Risk per share
- 2
- Stop distance
- 4%
- Loss if the stop is hit
- $100.00
This is a long trade (the stop is below the entry).
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How it works
- Risk amount = account balance × risk %.
- Stocks and crypto: position size = risk amount ÷ the distance between your entry and your stop. Stocks are rounded down to whole shares.
- Forex: lots = risk amount ÷ (stop in pips × the US dollar value of one pip on one lot), rounded down to 0.01 lots.
Example: A $10,000 account risking 1% can lose $100. Buying a stock at $50 with a stop at $48 risks $2 a share, so the size is 50 shares, worth $2,500.
Questions
How much should I risk per trade?
That is your decision. Many people learning to trade use a small fixed percentage, often 1% to 2% of the account, so one loss does little damage. The calculator only does the math for the number you enter.
Does it include fees, spread or slippage?
No. A real loss can be bigger than the result because of fees, the spread and slippage. If price gaps past your stop, for example overnight or over a weekend, the loss can be much bigger than planned.
What is a lot in forex?
A standard lot is 100,000 units of the first currency in the pair, a mini lot is 10,000 and a micro lot is 1,000. The calculator rounds down to 0.01 lots, the smallest size most brokers allow.
Which account currency does the forex mode use?
US dollars. When you pick a pair, ChartNox fills in the latest exchange rate from Yahoo Finance to convert the pip value into dollars, and you can type your own.
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Educational only. The results are arithmetic on the numbers you enter, not financial advice or trading signals. They do not include fees, spread or slippage.