Traders Calculator

Changes the wording only, except for futures where the contract multiplier applies.
Number of shares, coins, contracts or lots. Fractional quantities are allowed.
Same field as Quantity bought; supplied for compatibility with the "quantity" vocabulary. If both are given, this one wins.
In position-size mode this is your intended entry price.
For an open position, the last traded price you want to mark the position at.
Units of the underlying per contract. 1 for shares and coins; for futures use the multiplier in the contract specification.
Position-size mode only.
Position-size mode only.
Position-size mode only.
Position size
40.000000
Stock Profit Calculator
Cost basis
2,000.00
Amount at risk
200.00
Result type
Largest shares position whose stop-out loses the budgeted amount
Worked out from U.S. Securities and Exchange Commission - Cost Basis for Securities Transactions and 1 other source.
Brokers usually require whole shares or contracts; round the position size down to stay inside the risk budget.

How this is worked out

3 steps
  1. Risk budget = 20000 x 1% = 200
  2. Risk per unit = |50 - 45| x 1 = 5
  3. Position size = 200 / 5 = 40 shares

Results are general information, not financial, tax, legal, medical or engineering advice.