Position Size Calculator
Work out the exact size of every trade from your risk and stop-loss.
- Loading rates
- 29 symbols
Trade Details
Results update instantly as you change any field.
Account & Risk
Stop-Loss & Take-Profit
Prop Challenge Mode
See how many trades separate you from the challenge loss limits and target at this risk.
Commission & Margin
Commission is included in the position size.
Result
Costs & Margin
To calculate margin, enter the instrument's current price in the “Commission & Margin” section.
The suggested size is rounded down to a 0.01 lot step so the potential loss never exceeds your chosen risk.
Which MyProp Plan Fits You?
Based on the account size, risk per trade and risk-to-reward you entered in the calculator, we compare and rank MyProp plans for you.
Advanced Challenge
- At 1% risk per trade, you can take 6 losses in a row before the 6% daily limit.
- The 10% target takes about 5 winning trades (1:2 risk to reward).
- No time limit; trade without rushing.
- $88 for a $10,000 account.
Elite Account
Standard Challenge
Flex Challenge
This plan has no $10,000 balance; the closest one ($2,500) is used.
Fighter Plan
Reaching the target takes about 13 winning trades.
This recommendation is based only on your calculator inputs and is not financial advice. Check each plan's final rules and price on the challenge purchase page before buying.
What Is Position Sizing and Why Does It Matter?
Position size is the number of lots you trade. When the size matches your stop-loss, hitting the stop only costs the amount you planned to risk. This is the foundation of risk management and one of the most important factors for passing prop trading challenges.
Example: with a $10,000 account and 1% risk, the amount at risk is $100. With a 25-pip stop-loss on EUR/USD and a pip value of $10 per standard lot, the right size is 0.4 lots.
Formula
Fixed Risk Per Trade
Most professional traders risk between 0.5% and 2% of their account balance on each trade.
Mind the Daily Loss Limit
In prop challenges, the combined risk of open trades should never exceed the daily and overall loss limits.
Lot Sizes
One standard forex lot equals 100,000 units of the base currency; a mini lot is 0.1 and a micro lot is 0.01 standard lots.
Check Contract Specs
For gold (XAU/USD), one lot is treated as 100 ounces and one pip as a $0.10 price move; verify the exact specs on your platform.
Conversion rates come from public sources and may differ from your broker's live prices. Results are for educational and planning purposes only.