Drawdown Calculation Formula for Prop Firm Challenges

What Is Drawdown in Prop Firm Challenges?

Drawdown is the reduction in your account balance from a peak to a trough during a trading period. In prop firm challenges, drawdown rules are the single most common reason traders fail — not bad entries, not poor strategy, but misunderstanding exactly how the firm measures and enforces their drawdown limits.

Every prop firm sets two types of limits you must not breach:

• Maximum (Overall) Drawdown — the largest drop your account can experience from its starting balance or peak balance before your account is terminated.
• Daily Drawdown Limit — the maximum loss allowed within a single trading day, usually measured from the day's opening balance or the day's highest equity point.

Understanding how each is calculated — and the key difference between static and trailing drawdown — is the difference between passing your challenge and losing your funded account.

Types of Drawdown Rules

1. Static (Absolute) Drawdown

The drawdown limit is fixed to your initial starting balance and never moves regardless of profits made. This is trader-friendly because once you profit, you're further from the danger zone.

Example: $100,000 account, 10% max drawdown = $10,000 limit. Your floor is always $90,000. If you grow to $120,000, your floor is still $90,000.

2. Trailing Drawdown

The drawdown limit moves upward as your account equity increases. This is significantly more restrictive. As you profit, your floor rises with you — locking in a minimum balance based on your highest equity point.

Example: $100,000 account, 10% trailing drawdown. If you grow to $110,000, your new floor becomes $99,000. The limit "trails" your peak equity.

3. End-of-Day vs. Real-Time Trailing

Some firms trail drawdown based on end-of-day balance, others trail in real-time on live equity (including open positions). Real-time trailing is far more dangerous — an open trade that briefly peaks can raise your floor even if you close at break-even.

The Core Drawdown Formulas

Maximum Drawdown Formula

Daily Drawdown Formula

Current Drawdown % Formula

Step-by-Step Calculation Examples

Example 1: Static Drawdown on a $100K Account

Account: $100,000 | Max Drawdown: 10% | Daily Drawdown: 5%

• Max drawdown floor = $100,000 × (1 − 0.10) = $90,000 (fixed, never moves)
• Daily loss limit = $100,000 × 0.05 = $5,000 per day
• If you profit $8,000 → balance = $108,000, floor still = $90,000
• You now have $18,000 buffer — much safer position

Example 2: Trailing Drawdown on a $100K Account

Account: $100,000 | Trailing Drawdown: 10%

• Day 1: Balance grows to $105,000. New floor = $105,000 × 0.90 = $94,500
• Day 2: Balance grows to $112,000. New floor = $112,000 × 0.90 = $100,800
• Day 3: You're now profitable but your floor is ABOVE your starting balance
• A 10% retracement from $112,000 = $11,200 loss would breach the limit

Example 3: Daily Drawdown Based on Equity High

Some firms calculate daily drawdown from the day's equity high, not the opening balance. This is critical to understand:

• Opening balance: $100,000
• 9:30am: You open a trade, equity briefly touches $101,500
• Daily drawdown limit (5%) now calculated from $101,500 = $5,075
• If your account falls to $96,425 at any point that day — you're breached

Trailing vs Static Drawdown: Which Is Better?

TradersYard uses a static drawdown model, which means your floor never rises above your starting balance. This gives you room to recover from losing streaks without the risk of your own profits tightening the noose.

Common Mistakes That Cause Drawdown Violations

Mistake 1: Holding Trades Overnight Without Calculating Swap

Overnight swap fees are deducted from your balance and count toward drawdown. A trade that looks safe at market close can breach your daily limit when swap is applied at rollover.

Mistake 2: Averaging Down Into Losses

Adding to a losing position multiplies your exposure. If your original position is at -2% and you double down, a further 2% move against you creates a -6% loss, not -4%.

Mistake 3: Not Accounting for Spread and Commissions

Each trade has a cost. With a tight 5% daily drawdown limit on a $10,000 account ($500), ten trades with a $5 round-trip commission each = $50 gone before price moves at all. That's 10% of your daily allowance in commissions alone.

Mistake 4: Misreading Equity vs. Balance

Most firms measure drawdown on equity (balance + unrealised P&L), not just balance. An open losing trade that hits -8% on a 10% max drawdown account will trigger a breach even if you haven't closed the trade.

Frequently Asked Questions

Does drawdown reset daily?

The daily drawdown limit resets at the start of each new trading day (usually midnight server time or New York close). The maximum overall drawdown does not reset — it accumulates across the entire challenge period.

What happens if I breach the drawdown limit?

Your account is automatically disabled. In a challenge, you fail and must repurchase. In a funded account, you lose your funded status. Some firms offer a one-time reset or breach protection add-on — always check the terms.

Is drawdown calculated on open trades or closed trades only?

For most prop firms, drawdown is calculated on live equity — meaning open floating losses count immediately. If you have an open trade down $3,000 on a $5,000 daily limit, you only have $2,000 left for that day.

Can I recover from a near-breach situation?

Yes, but carefully. Stop trading for the day if you're within 1% of your daily limit. For max drawdown recovery, reduce position sizes significantly and focus on consistent small wins rather than trying to recover quickly.