Prop firm position size calculator
Enter your account, how much you want to risk and where your stop loss goes. It gives the lot size or number of contracts, and how many losses in a row your challenge's limits allow at that size.
How the position size is worked out
Position size = money at risk ÷ (stop distance × value of one pip or point for one lot). If you risk $500 with a 20-pip stop on EURUSD, where a pip is worth $10 for a standard lot, the size is 500 ÷ (20 × 10) = 2.5 lots.
- Forex: a standard lot is 100,000 units of the first currency. A pip is 0.0001, or 0.01 for yen pairs. When the second currency isn't the dollar, the pip value is converted, which is why some pairs ask for a rate.
- Gold and silver: enter the stop as a price move in dollars, such as 5.00 on gold. One lot of gold is usually 100 ounces, so $1 of movement is $100 a lot.
- Index CFDs and crypto: contract sizes differ between firms and platforms. Many prop platforms use $1 a point for one lot on US indices, but check yours and change the value.
- Futures: each contract has a fixed value per point, so the answer is a whole number of contracts, rounded down.
The size is always rounded down, so you never risk more than you set.
Read the guide: How much to risk per trade on a prop firm challenge
Fill it in from a challenge
Every challenge page has its rules in dollars and a pass plan. A few to start with:
- FTUK Flex Challenge
- Instant Funding One-Phase Pro
- Bullwaves Prime 1-Step 100K
- Lark Funding 1-Step Career
- Lark Funding Instant Master
- Funded Trading Plus Instant Program
Questions
How much should I risk per trade on a prop firm challenge?
Most traders who pass risk between 0.25% and 1% of the account per trade. The right amount depends on the account's daily loss limit and maximum loss: you want a normal losing streak to fit well inside both. Each challenge page on PropPassCheck shows the risk that gave the best results on its rules in our benchmark.
Why does the calculator round down?
So the trade never risks more than you asked for. If the exact answer is 2.57 lots, it gives 2.57; if it is 2.578, it gives 2.57, not 2.58.
Does this include spread and commission?
No. Spread, commission and slippage add a little to each loss, so leave some room, especially on very short stops.
Other calculators
- Prop firm drawdown calculator: how much can I still lose?
- Cost to get funded calculator
- Prop firm payout calculator
Calculations only, not financial advice. Check your firm's own rules and your platform's contract sizes before trading.