Risk, worked through
Why 1% risk is a quarter of your day on a prop challenge
On a challenge, the budget that matters is the room to today's floor, not the balance. A $50K Sprint example with EUR/USD, commission included, and how many stop-outs each risk level survives.
"Risk 1% per trade" is common advice, and on a personal account it is reasonable. On a prop challenge it needs a second look, because the account does not end when the balance runs out. It ends when equity touches a floor, and on most days the nearest floor is only a few percent away.
The budget is the room, not the balance
Take a $50,000 Sprint on day one. The daily limit is 4% of the Starting Day Balance:
- Starting Day Balance
- $50,000
- Daily floor, 4%
- $48,000
- Room for today
- $2,000
A 1% risk is $500. Against $50,000 that looks small. Against the $2,000 you can actually lose today, it is a quarter.
Sizing the trade
The lot size comes from the risk and the stop, with the commission added to the cost of each lot. For EUR/USD, one pip on a standard lot is worth $10, and the Sprint commission is $4.00 per lot.
- Risk, 1% of $50,000
- $500
- Loss per lot at a 20-pip stop
- 20 x $10 + $4 = $204
- Lots, rounded down
- 2.45
- Loss if the stop is hit
- $499.80
How many stop-outs a day can take
The same arithmetic at four risk levels, all with a 20-pip stop on EUR/USD:
| Risk per trade | Lots | Loss per stop-out | Share of today's room | Stop-outs before the floor |
|---|---|---|---|---|
| 0.25% | 0.61 | $124.44 | 6% | 16 |
| 0.5% | 1.22 | $248.88 | 12% | 8 |
| 1% | 2.45 | $499.80 | 25% | 3, the fourth leaves $0.80 |
| 2% | 4.90 | $999.60 | 50% | 1, the second leaves $0.80 |
At 1%, four losing trades in a row leave the account 80 cents above the floor. Any spread widening or slippage on the fourth stop and it is closed. In practice that is three losses. At 2%, it is one.
Four losses in a row is not rare. It happens to good strategies regularly.
The room changes every day
The daily floor is reset at 00:00 server time from the new Starting Day Balance. After a losing stretch the static maximum floor can become the tighter one, and the room shrinks further. On a $50,000 Sprint the static floor in the evaluation is $47,000:
- Starting Day Balance after losses
- $48,500
- Daily floor, 4%
- $46,560
- Static floor
- $47,000
- Room for today
- $1,500
Now a $500 loss is a third of the day. A fixed percentage of the balance is still roughly $485, but the room has fallen faster than the balance. Sizing against the room keeps the risk honest. How the two floors interact is explained in how the daily drawdown limit works.
Sizing and the rules
The Challenge Rules prohibit all-or-nothing exposure: positions so large that the account's result depends on a single trade or event (section 7.2). Sizing each trade as a small share of the day's room keeps you well away from that line, and gives the strategy enough attempts to work.
A few practical points:
- Decide how many losses in a row the day should survive, then work backwards to the risk per trade.
- Check the room at the start of each day. It is not the same number every day.
- Contract sizes and pip values differ by instrument. Gold, for example, is quoted per 100 ounces, so a $1 move is $100 per lot.
Commissions and leverage for each challenge are in sections 6.2 and 6.3 of the Challenge Rules.
This article explains the published VFUNDED rules with worked examples. It is not financial advice. VFUNDED provides simulated trading evaluations: trading activity is simulated and performance rewards are not guaranteed. Where this article and the Challenge Rules differ, the Challenge Rules apply.