Free Position Size Calculators
One division, four instruments, the same answer
Position size is the risk budget divided by the stop distance. Shares, lots, coins and contracts differ only in the unit that division produces - and in what else has to be checked once it does.
Position Size Calculator
Size a stock or share position from account risk and stop distance, with the risk actually taken and the position as a share of the account.
Result
Position size (units)
204
- Position value
- $8,670
- Risk budget
- $500
- Risk actually taken
- $500
- Risk per unit
- 2.4
- Stop distance
- 5.65%
- Position as a share of the account
- 17.34%
- Break-even price after fees
- 42.55
- Direction
- Long
This tool is for informational and educational purposes only. It is not financial or investment advice, and past performance does not guarantee future results.
Position size is decided by the stop distance, not by conviction. A wider stop always means a smaller position for the same risk.
The result is rounded down to whole units so the risk never exceeds the budget you set.
Read the full guide, worked examples and FAQ for this calculator →
Popular tools
The calculators visitors to PositionSizeTools open most often.
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Position Size Calculator
Size a stock or share position from account risk and stop distance, with the risk actually taken and the position as a share of the account.
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Forex Position Size Calculator
Convert account risk and a stop in pips into standard, mini and micro lots, using the pip value for your pair.
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Crypto Position Size Calculator
Size a crypto position from account risk and stop distance, with margin required and an estimated liquidation price when leverage is used.
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Futures Position Size Calculator
Convert account risk and a stop in ticks into a contract count, using the tick value for the instrument and per-contract fees.
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The rule does not change between markets. Decide what you are willing to lose, measure how far the stop is, divide. What changes is the unit: shares and units for equities, lots for forex, coins for crypto, contracts for futures.
Each calculator here handles the conversion for its market, and each adds the check that market requires - pip value for forex, liquidation distance for leveraged crypto, tick value and whole-contract granularity for futures.
Browse by category
Position Sizing
Size a trade correctly across stocks, forex, futures and crypto.
Why use PositionSizeTools
The stop sets the size
A wider stop always means a smaller position for the same risk. Sizing by capital or conviction instead means the account risk changes on every trade without anyone choosing it.
Correct units for each market
Standard, mini and micro lots for forex. Whole contracts for futures. Fractional units for crypto. Rounded down every time, so risk never exceeds the budget.
Leverage separated from risk
Leverage changes the margin required, not the loss at the stop. Where it does matter - liquidation sitting inside the stop - the calculators say so.
Fees inside the budget
Costs are deducted from the risk allowance rather than added on top, so the loss at the stop stays within the amount you decided to risk.
How it works
- Set the account risk percentage once and keep it constant across trades.
- Take the stop from the chart, not from what makes the position size comfortable.
- Divide, then check the position value as well as the risk.
- For leveraged instruments, confirm liquidation sits well beyond the stop.
Frequently asked questions
What percentage should I risk per trade?
This site does not suggest a number. It depends on your strategy and your tolerance for drawdown - the risk of ruin calculator is a better way to decide than a rule of thumb.
Does leverage change my position size?
No. Leverage changes the margin the broker requires. The loss at the stop is the stop distance multiplied by the position size, whatever leverage is available.
Why does the calculator round down?
So the risk never exceeds the budget you set. Rounding up would quietly raise the account risk above the level you chose.
Why did it return zero units?
Because a single unit, plus fees, risks more than your budget allows at that stop distance. That is a real answer - the trade cannot be taken at that risk level.
Is any of this financial advice?
No. These are calculators, for informational and educational use only. Nothing here recommends a trade, an instrument or a risk level, and nothing you enter leaves your browser.