Prop firm risk calculator: how many losing trades until the limit

Turn your daily buffer and risk per trade into the number of losers you can absorb. No sign-up.

Use the buffer from YOUR firm's dashboard or from the drawdown calculator.

Account balance

Remaining daily buffer (amount)

Risk per trade (% of balance)

Losing trades you want to survive

-Risk amount per trade

-Losing trades before the buffer is gone

-Largest risk % to survive your target losers

Enter your balance, the buffer you have left before your daily limit, and the percentage you risk per trade. It shows how many full-size losing trades fit in the buffer, and the largest risk per trade that still lets you survive the number of losers you choose.

The formulas

Risk amount per trade = balance x risk %
Losing trades before the buffer is gone = buffer / risk amount, rounded down
Largest risk % = buffer / (losers you want to survive x balance)

Spread, slippage and commission make real losses slightly larger than planned, so leave some room. A trade that is stopped out can lose a little more than its planned risk.

Using it well

Use the smaller of your daily and maximum buffers; the drawdown calculator shows both.
Size each trade from its stop distance with the position size calculator.
A streak of losses is normal; the losing streak calculator shows how often.

This calculator is for education. It is not trading or investment advice.

How many losers fit in the buffer? (hypothetical table)

These are illustrative numbers on a hypothetical $100,000 account with a remaining daily buffer of $4,000. They are not any firm's rules. Enter your own firm's figures in the calculator above.

Risk per trade	Amount risked	Full-size losers before the $4,000 buffer is gone
0.25%	$250	16
0.5%	$500	8
1%	$1,000	4
1.5%	$1,500	2

At 1.5% per trade, only two full losers fit in that buffer, and a third would take you past the floor. At 0.25% you can take 16. The cost of the smaller size is slower progress when you win, which is the trade-off every funded trader has to choose.

Matching risk to the streaks you will really see

Losing streaks are normal even for good strategies. In 100 trades at a 50% win rate, there is roughly an 81% chance of at least five losses in a row and a 17% chance of at least eight (the losing streak calculator gives the figures for your own win rate). If you risk 1.5% per trade, eight consecutive losses take about 11.4% off the account, which could exceed a typical limit. If you risk 0.5%, the same streak costs about 3.9%. Decide how long a streak you want to survive, then pick the risk that lets you survive it, which is exactly what the third output of the calculator does.

Size from the remaining buffer, not the starting one

The buffer shrinks as you lose. A trader who risks 1% of the starting balance each time keeps the same dollar risk when only half the daily buffer is left, so the number of losers they can still take drops quickly. A common approach is to re-run the numbers during the day: if the buffer after two losses is $2,000 and you want to survive three more losers, the largest risk per trade is $2,000 / 3, about $667. Whether to keep trading at all after losses is a decision for your plan, not for the calculator.

Include the costs you cannot see on the chart

Spread and commission make each loser slightly larger than the planned risk.
Slippage on news or at the open can fill a stop beyond the price you set.
Floating losses on open trades may count towards your daily floor depending on how your firm defines it. Check the dashboard rather than assuming.
Several trades at once. Correlated positions can all lose together, so count their combined risk against the buffer.

A sensible habit is to leave a margin of safety: if the calculator says you can take four losers, plan as if you can take three.

Journal the buffer, not just the trades

For every trading day, record the buffer you had at the start, the number of trades, the largest single loss and the closest you came to the floor. After a few weeks, the log shows your real habits: whether you risk more when the buffer is large, whether you take extra trades after a loss, and how often you finish a day close to the limit. The prop firm challenge tracker has columns for exactly this, and the prop firm drawdown calculator works out the buffer from your own firm's definitions. For the definitions themselves, read prop firm drawdown rules explained.

What this tool does not do

It does not know any firm's rules, it does not tell you whether you have breached anything, and it does not include costs. The firm's own dashboard is the only source of truth for your limits, and rules differ between firms and change over time. Read your firm's current rules before you size anything.

One more habit helps: when the buffer is small, reduce the risk per trade before you take the next setup, not after the next loss. A smaller buffer means the same risk costs a larger share of what is left, so the number of losers you can survive falls even though your strategy has not changed.

Frequently asked questions

How many losing trades can I take before hitting my daily limit?

Divide the remaining daily buffer by the amount you risk per trade and round down. The calculator does this.

What risk per trade should I use on a prop account?

That depends on your firm's limits and your plan. A smaller risk lets you survive longer losing streaks. Work out the largest risk that fits the number of losers you want to survive.

Does this include spread and slippage?

No. Leave extra room, since real losses can exceed planned risk.

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