Position size calculator
Lots, contracts or shares for a given risk and stop, on forex, indices, metals, crypto, shares and futures.
With the quoted rules of Topstep Trading Combine $50,000, version in force on 4 Nov 2026.
Result
Rules used
Topstep · Topstep Trading Combine $50,000 · rules in force on 4 Nov 2026 · rule versions #77, #78, #79, #105, #106, #107, #108, #110, #216
Open the firm pageHow it is computed
Size = (Balance × Risk %) ÷ (Stop × Pip size × Contract size × Conversion)
The amount you accept to lose is divided by what one lot loses at your stop. The result is rounded down to the volume step of the instrument, so the trade never risks more than you asked.
Worked example
Inputs
- Instrument
- EURUSD
- Account currency
- USD
- Account balance
- 50,000
- Risk per trade (%)
- 0.5
- Stop distance
- 20
Result
Position size
1.25 lots
- Amount at risk
- $250.00
- Risk at this size
- $250.00
- Loss at the stop per lot
- $200.00
Computed on the server by the same code as the form above (calculator table 2026-10-04.1).
By instrument
- EURUSD position size
- GBPUSD position size
- USDJPY position size
- USDCHF position size
- USDCAD position size
- AUDUSD position size
- NZDUSD position size
- EURGBP position size
- EURJPY position size
- GBPJPY position size
- EURCHF position size
- EURAUD position size
- AUDJPY position size
- CHFJPY position size
- GBPCHF position size
- USDMXN position size
- ES position size
- MES position size
- NQ position size
- MNQ position size
- YM position size
- MYM position size
- M2K position size
- CL position size
Firms whose quoted rules load into this calculator
Around economic releases
Many prop firms restrict trading around high-impact releases. Check the next ones before you size a trade.
Open the economic calendarQuestions
Why is the size rounded down?
Brokers accept volumes in steps (0.01 lot for forex). Rounding up would risk more than the amount you set; rounding down risks at most that amount.
Do I need an exchange rate?
Only when your account currency is neither currency of the instrument, for example EURGBP on a USD account. When it is the base currency, the current price is enough.
Can I use it for a prop firm account?
Yes. Load the quoted rules of a firm and the balance fills in with the account size of the program.
Related calculators
All toolsPip value calculator
What one pip, tick or point is worth in your account currency.
Margin and leverage calculator
Required margin, effective leverage, margin level and the largest position your equity allows.
Risk/reward calculator
Ratio of a trade plan and the win rate you need to break even with it.
Daily loss left
The exact rule of your firm: basis, reset time and time zone.
Tools traders use
Charting, journals, backtesting and servers. Listed alphabetically; we may be paid when you sign up through these links.
A calculation, not a forecast. Not investment advice.