How do I calculate lot size for a prop firm challenge?

Divide the amount you are willing to lose on the trade by the loss per lot at your stop: stop distance in pips x pip value per lot, plus commission per lot. Round down to 0.01 lots, then check the loss against today's drawdown room, not just the balance.

How much is one pip worth on 1 lot?

For pairs quoted in US dollars, such as EUR/USD or GBP/USD, one pip on a standard 100,000-unit lot is $10. For USD/JPY it is 1,000 yen divided by the price. For gold on a 100-ounce lot, a $1 move is $100.

How much should I risk per trade on a challenge?

The calculator shows what share of today's loss limit a single stop-out uses. Keeping each loss to a small part of the daily room leaves space for several losses in a row before any drawdown floor.

Free tool

Lot size calculator for prop challenges

Most lot size calculators know your stop. This one also knows your challenge: it shows how much of today's loss limit a single stop-out uses, and how many losses in a row you can take before a floor.

Challenge

Account size

Phase

Balance at 00:00 server time todayClosed balance after swaps. On day one it is the account size. Instrument Current priceAlso used for margin. Stop losspips

Risk per trade

% of start-of-day balance

Position size (lots): -
Loss if the stop is hit: -
Commission included, at the rate for this challenge in the Challenge Rules.
Share of today's loss limit: -
Stop-outs in a row: - today
before the floor for today, and - before the account's maximum drawdown floor.
Margin used: -

See every limit for this account: challenge rules calculator.

How the size is calculated

Lots = Risk ÷ (Stop × pip value per lot + commission per lot), rounded down to 0.01.

For pairs quoted in US dollars, such as EUR/USD, one pip on 1.00 lot is worth $10. For pairs with the dollar first, such as USD/JPY, the pip value depends on the price, which is why the calculator asks for it. Gold is sized per 100 ounces, so a $1 move is worth $100 per lot.

Why the daily limit matters more than the account size

On a prop challenge the real budget for today is the distance to the higher of the two floors, not the balance. A 1% risk sounds small until you see it is a quarter of the day's room on a 4% daily limit.

Check your platform

Contract sizes, pip values and commissions can differ by instrument. The calculator uses a standard 100,000-unit forex lot and a 100-ounce gold lot, and the commission and leverage published in the Challenge Rules (sections 6.2 and 6.3). Confirm the contract size shown on the platform before trading.

Position sizing and the rules

The Challenge Rules prohibit all-or-nothing exposure, where results depend on a single position or event. Sizing each trade so one loss uses only a small part of the day's room keeps you inside the rules and in the game.

This calculator is an illustration based on the VFUNDED Challenge Rules, not financial advice. VFUNDED provides simulated trading evaluations; trading activity is simulated and rewards are not guaranteed.