How to Calculate Max Drawdown for Prop Firm Challenges

Here is the short answer. For a static max drawdown, multiply your starting balance by the drawdown percentage. A $100,000 account with a 10% max drawdown gives you a floor of $90,000, and your equity can never touch that number. For a trailing drawdown, the floor is your highest recorded balance or equity minus the drawdown amount, so it climbs as you profit and then locks in place. The model your firm uses changes the math completely, so the first thing you do is find out whether your challenge is static, trailing, or end-of-day trailing.

This guide walks through both formulas with dollar figures across every common account size, shows you how the trailing floor ratchets up step by step, and explains the balance-versus-equity trap that breaches accounts before traders even close their trades. By the end you will be able to calculate your exact loss floor and monitor your live buffer in real time.

What Max Drawdown Actually Is

Max drawdown is the lowest point your account is allowed to fall to before the firm terminates it. Think of it as a hard floor under the entire challenge. Unlike a daily limit, the overall max drawdown is usually a lifetime number for that account: breach it once, at any moment, and the account is gone.

The detail that catches people out is that it is enforced in real time, intra-session. The firm is not waiting for you to close a position or for the day to end. The instant your equity (which includes floating profit and loss) crosses the floor, the breach is logged. That is why understanding the calculation is not academic. It is the difference between passing and starting over with a discount coupon.

The Static Max Drawdown Formula (with worked examples)

Static drawdown is the simplest model because the floor never moves. The formula is:

A $50,000 account with an 8% max drawdown gives you $50,000 × 0.08 = $4,000. Your floor is $46,000. Profit all you want, lose all you want, that floor stays at $46,000 for the life of the account. Here is the grid for the account sizes and drawdown percentages you will actually see in challenges.

Find your row, find your column, and that cell is the number your equity must stay above for the entire challenge. Write it on a sticky note next to your screen. This is the model I prefer for newer challenge traders because the floor is predictable and you never have to recalculate it after a winning day. TradersYard offers a static drawdown option for exactly this reason.

How to Calculate Trailing Drawdown

Trailing drawdown is where most failed challenges actually happen, because the floor moves and traders forget to update it. The formula:

The drawdown amount itself is fixed, but it follows your peak upward. Walk through a $100,000 account with a $10,000 (10%) trailing drawdown:

Start: peak is $100,000, so the floor is $100,000 − $10,000 = $90,000.
You grow to $108,000: the new peak is $108,000, so the floor ratchets up to $108,000 − $10,000 = $98,000. On a pure-trailing model the floor would sit near $97,200 if it trailed equity at a mid-day high of $107,200; the point is it moves with whatever high your account prints.
You pull back to $103,000: the floor does NOT come back down. It stays at $98,000. The trailing floor only ever moves up, never down.

Notice what happened. After reaching $108,000 you only have $103,000 − $98,000 = $5,000 of room left, even though you are still $3,000 in profit overall. Many traders blow up here because they mentally anchor to their original $90,000 floor that no longer exists. On most prop trailing models the floor stops trailing once it reaches your starting balance plus a set buffer, locking your worst case at breakeven. Always read your firm's rules to confirm where the trail locks.

Static vs Trailing vs End-of-Day

Three models, three calculations, three risk profiles. Here is how each one is computed and which gives you the most breathing room.

End-of-day trailing, which TradersYard offers as an EoD-max type, is materially kinder than intraday trailing. If your account spikes to $107,000 mid-session but closes at $102,000, an intraday model tightens the floor based on $107,000, while an EoD model only updates from the $102,000 close. That difference can be hundreds or thousands of dollars of buffer. If you can choose, a static or EoD model removes a whole category of accidental breaches.

Balance vs Equity: Why Open Trades Count

This is the single most expensive misunderstanding in challenge trading. Balance is your closed, settled account total. Equity is your balance plus or minus the floating profit and loss of every open position. Almost every firm measures the max drawdown against equity, not balance.

What that means in practice: you do not have to close a losing trade to breach. If your balance is $46,500 on a $50,000 static account with a $46,000 floor, and you are holding an open position that is down $700, your equity is $45,800. You are already breached, even though you were planning to "wait for it to come back." The firm's system saw $45,800 the instant your floating loss crossed that line. Always calculate against equity, and treat open positions as if they are already realized when you measure your distance to the floor.

Max Drawdown vs Daily Drawdown

These are two separate limits calculated separately, and you have to respect both at the same time. The overall max drawdown is the lifetime floor we have been calculating. The daily drawdown is a smaller limit that resets every day, usually at 00:00 UTC, and it is measured from your balance or equity at the start of that trading day.

Example on a $100,000 account: a 5% daily limit means you cannot lose more than $5,000 from where the day opened. Open the day at $100,000 and your daily floor is $95,000 for today only. Tomorrow it resets to wherever you close. The max drawdown floor, by contrast, is permanent. At any moment your binding constraint is whichever floor is higher. New traders blow daily limits far more often than max limits, because the daily number is tighter and resets create a false sense of safety. For a fuller breakdown read our guide on daily drawdown vs max drawdown explained.

Track Your Live Distance to Breach

Once you know your floor, the only number that matters during a session is your remaining buffer. The running calculation is dead simple:

If your current equity is $97,000 and your floor is $92,000, you have $5,000 of room before termination. Run this against both your daily floor and your max floor and use the smaller of the two buffers, because that is the one that will breach first. The Yard platform shows your live equity and the active drawdown limits on the account dashboard, so you can read these figures directly rather than tracking them in a spreadsheet. Check the buffer before every trade, not after.

Turn Your Buffer Into Position Size

A floor is only useful if it controls your risk. The professional approach is to risk a small fixed percentage per trade so that even an ugly losing streak cannot reach the floor. Risk 0.5% to 1% of the account per trade and the math protects you.

On a $100,000 account with a $10,000 buffer, risking 1% ($1,000) per trade means it would take ten consecutive full losses to breach. Drop to 0.5% ($500) and it takes twenty. Most disciplined strategies do not lose ten or twenty in a row, so you give yourself a wide statistical margin. Size each position from your stop distance: position size = dollars risked divided by the per-unit distance to your stop. This is how you keep the calculation defensive instead of reactive. Our walkthrough on position sizing for prop firm challenges covers the lot-size math in full.

Common Mistakes and Edge Cases

Forgetting open positions count. The biggest one, covered above. Floating losses breach the floor before you close. Calculate on equity, always.

Miscalculating the trail during a winning day. On an intraday trailing model, a quick spike to a new high permanently tightens your floor even if you give the profit back. Recalculate your floor every time you print a new equity high, not just at the end of the day.

Ignoring swaps, commissions and overnight fees. These quietly eat your buffer. A position held over several nights can accrue enough in swap charges to nudge your equity into the floor on its own. Subtract expected fees when you measure your distance to breach.

Confusing the daily and max limits. Traders survive a scary day, see the daily floor reset, and assume they are safe, while their permanent max floor is still right beneath them. Track both numbers every session. For the full set of constraints, see our prop firm challenge rules explained guide.

FAQ

Is max drawdown calculated on balance or equity?+

Almost always equity. Equity is your balance plus or minus the floating profit and loss on open trades, so an unrealized loss can breach the floor before you ever close the position. Always run the calculation against equity, and treat any open position as if it were already realized when you measure how close you are to the limit.

What is the difference between static and trailing max drawdown?+

A static floor is fixed at the start and never moves, so your profits become a permanent cushion above it. A trailing floor follows your highest balance or equity upward and locks at each new peak, so as you grow the account the floor climbs with you and your effective buffer can shrink. Static is the more forgiving model.

How do you calculate trailing drawdown after the account grows?+

Take your highest recorded balance or equity and subtract the fixed drawdown amount. A $100,000 account with a $10,000 trailing drawdown starts with a $90,000 floor. Grow to $108,000 and the floor moves up to $98,000. If you then fall back to $103,000 the floor stays at $98,000, because a trailing floor only ever ratchets up, never down.

Does max drawdown reset each day like daily drawdown?+

No. The overall max drawdown is a permanent floor for the life of the account. The daily drawdown is a separate, usually smaller limit that resets each day (commonly at 00:00 UTC) from where the day opened. You must respect both at once, and your binding constraint at any moment is whichever floor is higher.

What happens if you breach the max drawdown in a prop firm challenge?+

The account is terminated, usually instantly and automatically the moment your equity crosses the floor. There is no warning and no grace. At TradersYard a failed account does not get a free reset, but you do receive a 10% discount coupon toward a new challenge. The fix is to never get close: track your live buffer and size positions so a losing streak cannot reach the limit.