Sizing a Nasdaq 100 (US100) Position on a $100 Account: A Worked Example

On a $50–$100 account, the question usually isn't how much you could make. It's whether the smallest trade your broker allows already risks more than you can afford to lose. This guide works through risk-based position sizing for the Nasdaq 100 step by step. All the trade numbers below are round and hypothetical. They show how the arithmetic works. They are not a trade idea.

This is general education. It isn't a recommendation to buy, sell or hold anything, and it says nothing about where the index is heading.

What you're trading when you trade "US100"

"US100" is a broker label, not an exchange ticker. The Nasdaq-100 is often abbreviated as NDX, NDQ, NAS100, or US100. The index itself is made up only of stocks listed on the Nasdaq. The product you trade under that label is a different thing: US100 is typically a CFD (Contract for Difference) offered by forex/CFD brokers. NQ futures trade on a centralized exchange with transparent pricing, while US100 CFDs are broker based products.

Two brokers can show the same chart and still offer different products. The chart may look similar, but contract size, minimum lot and point value can differ by broker. Open the contract specification and check what the symbol tracks before you size anything.

Some context on where the index stands as of this week. On 2 November 2026, the Nasdaq 100 had fallen more than 750 points from its intraday peak and finished down 1.39% at 27,989.82. That close put it 10% below its October 6 record. On 3 November, the Nasdaq-100 rose 0.7% to 28,180.26, remaining in correction territory. These numbers matter here for one reason: they show how far the index can move in a single session.

The sizing formula in one line

Position size = risk in dollars ÷ (stop distance in points × dollar value per point per unit)

There are three inputs:

1. Risk in dollars: how much of the account you accept losing if the stop is hit. 2. Stop distance: how many index points separate your entry from your exit if you're wrong. 3. Value per point: how many dollars one index point is worth at one unit of size. This depends on the broker and the product.

The formula gives you a size. Then you compare that size with the broker's minimum. That comparison is where small accounts run into trouble.

Step 1: Set the risk budget

Many traders cap the risk on any single trade at a small fraction of the account. A 1% cap is a common teaching example. On a $100 account, 1% is $1. On a $50 account, it's $0.50.

Those amounts look trivially small, and that's on purpose. A run of losing trades is normal in any approach. A small fixed fraction lets the account survive that run. If you raise the percentage, losses add up faster and the account can drain much more quickly.

Step 2: Set the stop from the market, not your balance

The stop should go where your trade idea is shown to be wrong, for example beyond a recent swing level. It shouldn't be set at whatever distance happens to fit your account.

Compare any stop with how much the index actually moves. On 2 November, the Nasdaq 100 traded between 27,967.44 to 28,753.39. That's a range of roughly 786 points (our arithmetic). A 10-point stop is very small next to a swing like that, and ordinary noise can trigger it.

Step 3: Find the minimum size and value per point

You need two numbers from the specification: the minimum trade size and what one point is worth at that size. Both vary.

Minimum size. One broker lists its US100 CFD with Contract size: 1 and Minimum trade: 0.10 lot. Another's illustrative NAS100 specification shows a Minimum lot size · 0.01.

Value per point. Most retail and prop firm brokers use a contract size of $1 per point per lot for NAS100, but there are exceptions: Some brokers use a different contract size where 1 lot = $10 per point. The difference matters a lot at the minimum size. If 1.00 lot equals $10 per point, then 0.01 lot is about $0.10 per point.

Micro futures. Exchange-traded futures have fixed terms. The Micro E-mini Nasdaq-100 futures contract is $2 x the Nasdaq-100 Index and has a minimum tick of 0.25 index points. Each tick of 0.25 points is worth $0.50. You can't trade less than one contract, so $2 per point is the smallest exposure the micro future offers.

Worked example: one trade, three products (hypothetical)

All three versions use the same made-up setup:

• Account: $100
• Risk budget: 1% = $1
• Index level: 28,000 (rounded)
• Stop distance: 50 points

The formula asks for $1 ÷ 50 points = $0.02 per point. Now see whether each product can actually offer that.

Version A: CFD with a 0.01-lot minimum, $1 per point per lot

• Minimum exposure: 0.01 × $1 = $0.01 per point.
• Size needed: $0.02 ÷ $1 = 0.02 lots. That's above the minimum, so it can be done.
• Loss if the stop fills exactly: 50 × $0.02 = $1, which is 1% of the account.
• Notional exposure: 0.02 × 28,000 = $560.

This is the only version where the sizing works.

Version B: smallest CFD exposure is $0.10 per point

This happens with a 0.10-lot minimum at $1 per point per lot. It also happens with a 0.01-lot minimum at $10 per point per lot.

• Minimum exposure: $0.10 per point. That's five times the $0.02 the formula asked for.
• Loss at the 50-point stop: 50 × $0.10 = $5, or 5% of the account.
• Notional exposure: about $0.10 × 28,000 = $2,800.

The minimum size is already five times your risk budget. Margin may also stop you from opening the trade. ESMA's retail CFD leverage limits include 20:1 for non-major currency pairs, gold and major indices, and the NASDAQ 100 index has also been included in the asset class of major indices. In the EU and UK, that cap is 20:1 on major-index CFDs (a 5% margin requirement); offshore brokers may offer higher caps. At 5%, $2,800 of notional needs about $140 of margin, which is more than the whole account.

Version C: one Micro E-mini Nasdaq-100 future

• Exposure: $2 per point, the smallest size available.
• Loss at the 50-point stop: 50 × $2 = $100, the entire account.
• Notional exposure: about 28,000 × $2 = $56,000.

To stay within a $1 budget, the stop would have to be half a point, which is two ticks. That isn't a realistic stop in an index that moved more than 750 points from high to close on 2 November.

The "maximum stop" test: when the minimum is too much

Turn the formula around and you get a quick check you can run before any trade:

Maximum stop the minimum size allows = risk budget ÷ (minimum size × value per point)

With $1 of risk (hypothetical):

If the stop your setup needs is wider than the maximum in that table, the minimum size is too much risk for your budget. You then have three options:

• Skip the trade. Passing on a trade costs nothing.
• Use a product with a smaller minimum. Compare specifications first, including what the symbol tracks.
• Knowingly accept a larger risk percentage. That's a real choice with a real cost. At 5% per trade, a run of losses empties the account far faster than at 1%.

Don't tighten the stop just to fit the size. A stop that sits inside normal price swings tends to get hit by noise, and you take the full loss anyway.

Leverage: look at notional, not margin

The margin a broker requires shows the minimum deposit needed to open a position. Notional exposure shows what your profit and loss actually follows.

Take the 2 November session as a reference: the index moved more than 750 points from its intraday high to the close. Apply a 750-point adverse move to the hypothetical positions above (our arithmetic):

• Version A ($0.02 per point): a loss of about $15, or 15% of the account.
• Version B ($0.10 per point): a loss of about $75, or three-quarters of the account.
• Version C ($2 per point): a loss of about $1,500, many times the account.

A stop is supposed to limit that kind of loss. It only helps if it's in place and actually gets filled.

There is a legal floor on losses in some jurisdictions. Under EU-style rules, negative balance protection caps a retail client's liability at the funds in the account: the balance cannot fall below zero, but the deposit can be lost. It does not make trading low-risk and it does not protect the deposit itself. Check whether this protection applies to your account. It's a retail entitlement in certain jurisdictions, and not every provider or account type offers it.

Costs and gaps hit small accounts hardest

Spreads. One broker lists a typical US100 cost of Standard 2.9 points · no commission. On a hypothetical 50-point stop, a 3-point spread is 6% of the distance to your stop, paid as soon as you enter.

Overnight funding. CFDs held overnight usually carry a financing charge or credit, and it's based on the full notional rather than the margin.

Gaps and slippage. A standard stop becomes a market order once it's triggered. If the price jumps past your level, for example after the open or a data release, the fill can be worse than planned. Your $1 risk could turn out to be $2 or more.

The base rate

Regulators have measured how retail traders fare with these products. The FCA's analysis of a representative sample of client accounts for CFD firms found that 82% of clients lost money on these products. Later reviews give a similar picture: The FCA's 2016 sample found 82%, and EU regulators' studies found 74–89%. UK providers' own required disclosures, 61%–73.6% for those we checked in October 2026, show that most retail accounts still lose money.

Position sizing doesn't change those odds. It controls how much each wrong trade costs. It doesn't make trades more likely to be right.

Where signals fit

If you use any trade signal, including the output of Markitel's rule-based ten-factor technical engine, the sizing is still your job. A signal can suggest a direction or a level, but it doesn't know your balance, your broker's minimum lot or your margin rate. Run the maximum-stop test every time. No signal or tool can guarantee a profitable outcome. Markitel provides market data and tools only. It is not a broker, custodian or adviser.

Key takeaways

• Size from risk, not from what margin allows: size = risk in dollars ÷ (stop in points × value per point). Compare the result with the broker's minimum before you place the trade.
• Run the maximum-stop test: divide your risk budget by the minimum size's dollars per point. If your setup needs a wider stop than that, the minimum is too much risk.
• The specification matters a lot on $100: in the hypothetical example, $0.01 per point fit a 1% budget, $0.10 per point risked 5%, and one micro future risked the whole account.
• Leverage magnifies losses: judge exposure by notional value, and allow for spreads, overnight funding and gaps. Stops are not guaranteed fills.
• Skipping a trade is a valid result: if the smallest available size breaks your risk rule, don't trade it. Neither tightening the stop nor quietly raising the risk percentage solves the problem.