The PTDD Ratio Explained: The One Number That Tells You Which Challenge You'll Pass

Published 2026-07-15 · The Rules

The PTDD ratio is the profit target divided by the drawdown allowance — one small piece of division that tells you, in a single number, how much you have to make relative to how much you’re allowed to lose. A $3,000 target against a $2,000 drawdown is a PTDD of 1.50: you need to net 50% more than the market is allowed to take from you. Lower is friendlier. That’s the entire concept, and once you can compute it in your head you’ll never again buy an evaluation without knowing exactly what you signed up for. Two challenges at the same price can be wildly different tests, and this is the number that exposes it in about eight seconds.

Key Takeaways

• PTDD = profit target ÷ drawdown allowance. $3,000 target ÷ $2,000 drawdown = 1.50. Below 1.00 is exceptionally generous, 1.00–1.50 is friendly, 1.50–2.00 is standard, above 2.00 is demanding.
• There are two useful flavours and most articles only cover one: PTDD against the maximum drawdown (how much rope you have overall) and against the daily loss limit (how many good sessions the target really takes).
• We translate PTDD into R-multiples below — a 1.50 ratio means you need +12R of net profit with an 8R buffer, which is a far more honest picture of the task than a percentage ever gives you.
• A second ratio you should always compute: max drawdown ÷ daily loss limit. It tells you how many maximum-loss days your account can absorb, and it’s where two challenges with identical PTDDs stop being identical.
• Run the numbers before you pay. Ten minutes with a calculator is the cheapest edge available in this entire business.

The formula, and what it’s actually measuring

PTDD stands for profit-target-to-drawdown. Divide one by the other:

PTDD = Profit Target ÷ Drawdown Allowance

That’s it. If the firm asks for $3,000 in profit and gives you $2,000 of drawdown before the account stops, your PTDD is 3,000 ÷ 2,000 = 1.50.

What the number means in plain English: for every dollar the market is allowed to take from me, how many dollars do I need to produce? At 1.50, you need a dollar-fifty for every dollar of rope. At 1.00, target and rope are equal — a beautifully balanced test. At 2.00, you need double what you can lose, which is a real ask and needs a real edge.

Lower is better for the trader. That’s the only direction you need to remember.

What counts as a good ratio

Here’s how to read the number the moment you compute it:

Note what this table is not saying. A demanding ratio isn’t a bad firm — it’s often a firm paying a bigger split, offering a larger account, or charging a smaller fee. It’s a trade, and now you can see both sides of it. What matters is that you never discover the difficulty after you’ve paid.

Worked math: PTDD across five illustrative setups

Numbers make this click instantly. These are illustrative account configurations, not any particular firm’s offer — the point is the arithmetic, which works on whatever real numbers you find on a rules page.

Look at C and D. Same account size, same profit target, same headline “$100K challenge” — and one gives you 50% more rope than the other. On the marketing page, they’d both be “a $100K evaluation.” In reality, D is a materially more achievable test, and the only thing that revealed it was one division.

Setup E is the ideal shape: your target equals your rope. If you find a 1.00 or below in the wild, you’ve found something worth a serious look.

The flavour nobody computes: PTDD against the daily limit

Almost every firm runs two loss rules — an account-lifetime maximum drawdown and a per-session daily loss limit. The standard PTDD uses the maximum. But the daily-limit version is quietly more useful, because it tells you something the other one can’t: how big a lift the target really is, session by session.

Daily PTDD = Profit Target ÷ Daily Loss Limit

Read it as: my target equals this many maximum-loss days of profit.

That last column is the reality check that turns an abstract target into a plan. Setup A doesn’t need a hero month. It needs six sessions where you make half of what you’re allowed to lose. Written that way, a $3,000 target stops feeling like a mountain and starts feeling like a fortnight of ordinary, disciplined work — which is exactly what it is.

Our daily loss limits guide covers the mechanics of that rule in full, including the enforcement styles that decide when it’s checked.

How Leo turned a scary target into a two-week plan. Leo kept bouncing off a $3,000 target because he was trying to make it in a session or two and sizing accordingly. Then he did the division: $3,000 ÷ a $1,100 daily limit = 2.73. His target was worth under three maximum-loss days. He set a modest goal of $550 a session — half his allowed loss — and told himself six green sessions was the whole job. He hit the target in nine trading days with his largest single-day gain at $780. Nothing about his strategy changed. The arithmetic just gave him permission to trade small.

PTDD in R-multiples: the version that tells the truth

Percentages hide things. R-multiples don’t. An “R” is simply one unit of your per-trade risk — if you risk $250 a trade, 1R = $250.

Take Setup A: a $3,000 target, a $2,000 drawdown, and a trader risking $250 per trade.

You need to net twelve R with an eight-R buffer. That is a completely different sentence from “make 6% without losing 4%”, and it’s the one that actually tells a trader what to do. Now bring in a realistic edge — say a 45% win rate at 1.5R per winner:

• Average win: 0.45 × 1.5R = 0.675R
• Average loss: 0.55 × 1.0R = 0.550R
• Expectancy: 0.675 − 0.550 = +0.125R per trade — that’s $31.25 on a $250 risk unit
• Trades needed for 12R (=$3,000): 3,000 ÷ 31.25 = 96 trades

Ninety-six trades. At 5 trades a day, that’s about four weeks. And your 8R buffer? A run of 8 straight losses at a 55% loss rate has a probability of 0.55⁸ ≈ 0.84% — well under one in a hundred. The math isn’t telling you this is a coin flip. It’s telling you that a modest, genuine edge plus sane sizing clears this challenge, and that the buffer is there to absorb exactly the kind of streak that shows up once in a very long while.

That’s what PTDD is really for. It converts a marketing page into a workload you can schedule.

The ratio PTDD doesn’t capture — and how to fix it

Here’s where you get ahead of almost everyone else reading about PTDD. The ratio compares your target to your rope. It says nothing about how fast you’re allowed to use the rope. For that, compute one more division:

Resilience = Max Drawdown ÷ Daily Loss Limit

Read it as: how many maximum-loss days can this account absorb before it’s over?

Compare A and F. Identical PTDD of 1.50 — and F can absorb three maximum-loss days where A can absorb 1.8. If you’re choosing between them, F is meaningfully the kinder account, and PTDD alone would have told you they were twins.

Compare B, too. It has the friendliest PTDD in the table at 1.20, and the worst resilience at 1.0 — one maximum-loss day and the account is at its floor. That’s not a reason to avoid B. It’s a reason to trade B with a personal daily cap set well inside the firm’s, which is what you should be doing anyway.

Two divisions. Fifteen seconds. A complete read on any evaluation on the internet.

How Ana broke a tie between two firms. Ana had two $50K evaluations open in browser tabs at nearly identical prices. Both had a PTDD of 1.50, so on the standard metric they were the same challenge. She ran the resilience number: one gave 1.8 maximum-loss days, the other gave 3.0. She took the 3.0. Six weeks later she’d hit target — and along the way she had one genuinely rough Tuesday that would have left her with almost no room on the other account. The number that broke the tie was the number the marketing pages don’t print.

How the drawdown type bends the ratio

One last layer, and it’s the one that separates a good PTDD read from a great one. PTDD assumes your rope stays the same length. Under a static drawdown, it doesn’t — it gets longer as you profit.

Setup A again: $50,000 account, $3,000 target, $2,000 drawdown, PTDD 1.50.

The static trader’s effective PTDD improves with every dollar earned, because the denominator quietly grows. The trailing trader’s stays exactly where it started. Two challenges with a printed PTDD of 1.50 are simply not the same difficulty if one is static and one trails — and now you know which way to lean. Our static drawdown guide runs the same trade sequence through both models, and trailing drawdown explained covers the mechanic in detail.

How Tomás bought the “harder” challenge on purpose. Tomás compared a 1.20 trailing evaluation against a 1.50 static one and chose the 1.50 — deliberately. His reasoning: the static floor meant his rope would grow from $2,000 to over $4,000 by the time he was two-thirds of the way to target, while the trailing account would keep him on a fixed leash the whole run. He was right. He passed with $4,600 of cushion beneath him and never once felt squeezed. The higher ratio was the easier challenge, because he understood what the ratio couldn’t see.

Your ten-minute pre-purchase checklist

Before you pay for any evaluation, open the rules page and write down five numbers:

1. Profit target (in dollars, not percent)
2. Maximum drawdown (in dollars)
3. Daily loss limit (in dollars)
4. Drawdown type — static, EOD trailing, or intraday trailing
5. Your intended per-trade risk

Then do three divisions: target ÷ max drawdown (PTDD), target ÷ daily limit (how many good sessions this really takes), and max drawdown ÷ daily limit (how many bad days you can absorb). Convert the last two into R using your risk unit, and you’ll know more about that challenge than the person who wrote the sales page.

This is the cheapest research in trading. Nobody does it, it takes ten minutes, and it routinely reveals that the challenge you were about to buy is 30% harder than the one next to it at the same price.

Pick the challenge you’re most likely to pass

The PTDD ratio isn’t there to talk you out of anything. It’s there to point you at the evaluation where your existing edge — the one you already have — has the best possible chance of doing its job. That’s a wonderful thing to have. Most traders pick a firm on the profit split and the logo. You’re going to pick on the math, and that alone puts you ahead of the pack before your first trade.

Run the divisions, pick your setup, size sensibly, and go get funded. Start by comparing profit targets and drawdown structures side by side in our prop firm directory — then walk into your first session already knowing exactly what the job is. If you want the full playbook for the challenge itself, how to pass a prop firm challenge is your next read, and prop firm challenges explained covers how the whole evaluation landscape fits together.

FAQ

What is the PTDD ratio in prop trading? It’s the profit target divided by the drawdown allowance — a single number describing how much you must make relative to how much you’re allowed to lose. A $3,000 target against a $2,000 drawdown is a PTDD of 1.50. Lower is friendlier to the trader, and anything at or below 1.00 is genuinely generous.

What’s a good PTDD ratio? Below 1.00 is exceptional, 1.00–1.25 is friendly, 1.25–1.75 is the industry standard and very passable, and above 2.00 means you need to produce more than double your rope. None of these are disqualifying — a demanding ratio often comes with a better split or a bigger account — but you should always know which one you’re buying.

Should PTDD use the maximum drawdown or the daily loss limit? Compute both. Against the maximum drawdown it tells you your overall rope. Against the daily loss limit it tells you how many strong sessions the target actually represents — which is the version that turns a target into a schedule. A $3,000 target against a $1,100 daily limit is 2.73, meaning your target is worth under three maximum-loss days of profit.

Does a low PTDD ratio guarantee an easier challenge? No, and this is where most traders stop too early. Also divide the maximum drawdown by the daily loss limit to see how many full loss days the account can absorb. Two challenges with an identical PTDD of 1.50 can differ enormously — one might survive 1.8 bad days and the other 3.0.

How does drawdown type affect the PTDD ratio? Enormously. Under a static drawdown your rope grows as you profit (a $2,000 buffer becomes $5,000 by the time you hit a $3,000 target), so your effective ratio improves the whole way. Under a trailing drawdown the rope stays the same length no matter how well you trade. A 1.50 static challenge can be genuinely easier than a 1.20 trailing one.

How many trades does a typical profit target take? Do the expectancy math. At a 45% win rate with 1.5R winners, your expectancy is about +0.125R per trade. Risking $250 per trade, that’s $31.25 a trade, so a $3,000 target needs roughly 96 trades — about four weeks at five trades a day. A real target, a real timeline, and no heroics required.