1. Your account rules

Copy these from your firm's dashboard or rules page. They're saved in this browser so you only enter them once.

Starting Balance ($)

Current Balance or Equity ($) Use equity if you have trades open.

Max Loss Type

Max Loss (% of starting balance)

Highest Balance Reached ($)

My Max Loss Floor ($)

Daily Loss Limit Measured From

Daily Loss Limit (%)

Balance at the Start of Today ($) Your firm's daily reset snapshot. Check its reset time.

Profit Target (%) 0 if you're funded with no target.

Max Loss Floor

Daily Loss Floor (Today)

Your Buffer Right Now

Profit Still Needed

2. Your trade

Instrument

Entry Price

$ per Pip for 1.00 Lot Filled in for you. Check it against your platform's symbol info.

Leverage (e.g. 30 for 1:30) Shown on your platform for each symbol. Leave blank to skip the margin check.

Stop Distance (pips) Distance from your entry price to your stop loss price.

Take-Profit Distance (pips) Optional. Used for the path to target.

Your Position Size (lots) The size you plan to trade, or are holding now.

Max Share of Buffer to Risk per Trade (%)

Risk on This Trade

Max Size for This Stop

Room Before the Floor (at your size)

Price Where You'd Hit the Floor

3. Path to your target

Based on the trade above, repeated at the same size. Averages, not a forecast.

Your Win Rate (%) From your own trade history, if you know it.

Reward if Target Hits

Net Wins Needed to Pass

More wins than losses, by this many.

Losses in a Row You Can Take

Trades to Target at Your Win Rate

How prop firm drawdown limits work

Most prop firms set a maximum loss: a floor your account must stay above. A static floor is fixed from your starting balance (6% of $10,000 puts it at $9,400). A trailing floor follows your highest balance by a fixed dollar amount and never moves down. Some firms trail intraday (including open profit), others only at the end of the day.

Many firms also set a daily loss limit, usually measured from your balance at the daily reset. On any given day, your real buffer is whichever floor is closer. Check your firm's current rules.

Formulas

buffer = current balance − the closer of your max loss floor and today's daily floor
risk on a trade = stop distance × value per pip or point × position size
max size = round down((buffer × risk share) ÷ (stop × value per pip or point))
max size by margin = current balance × leverage ÷ value of 1 lot
net wins needed = profit still needed ÷ reward per winning trade

Lots round down to 0.01 and futures round down to whole contracts. Your stop distance is measured from your entry price, so the spread is already included when you set the stop on your platform.

Worked example: $10,000 account, 6% static max loss, 5% daily limit

The max loss floor is $9,400. If you start the day at $10,000, today's daily floor is $9,500, so your buffer is $500. Risking 25% of it ($125) on EUR/USD with a 30-pip stop ($300 per lot) allows 0.41 lots. With a 45-pip target, each win at 0.41 lots makes $184.50, so reaching a $1,000 profit target takes 6 more wins than losses.

Maximum size at a 50% risk share

Instrument (stop)	Risk per 1 lot / contract	$2,000 buffer	$1,000 buffer	$500 buffer
EUR/USD (30 pips)	$300	3.33 lots	1.66 lots	0.83 lot
XAU/USD, 100 oz ($10)	$1,000	1.00 lot	0.50 lot	0.25 lot
BTC/USD, 1 BTC ($2,000)	$2,000	0.50 lot	0.25 lot	0.12 lot
NQ (20 pts)	$400	2	1	0
MNQ (20 pts)	$40	25	12	6

See the floor on your chart

The free, open-source TradeGuard Trailing Floor indicator plots the high-water mark and trailing floor live on TradingView.

This calculator is a planning aid, not financial advice, and not a guarantee against breaching any firm's rules or of passing an evaluation. Lot sizes, pip values and leverage differ between platforms and firms, especially for gold, indices and crypto: check your platform's symbol info. The margin check ignores margin already used by other open trades. Futures values are standard CME point values.